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Land , fix fallback to 128-bit AES keys for some java versions

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This commit is contained in:
Tim W 2020-06-30 13:50:51 +08:00
commit 8ef00734b2
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GPG Key ID: 217FBA50ABBAABEF
2 changed files with 13 additions and 8 deletions
java/meterpreter/meterpreter/src/main/java/com/metasploit/meterpreter
Transport.java
core
core_negotiate_tlv_encryption.java

5
java/meterpreter/meterpreter/src/main/java/com/metasploit/meterpreter/Transport.java

@ -18,6 +18,7 @@ public abstract class Transport {
public static final long MS = 1000L;
public static final int ENC_NONE = 0;
public static final int ENC_AES256 = 1;
public static final int ENC_AES128 = 2;
private static final SecureRandom sr = new SecureRandom();
@ -100,7 +101,7 @@ public abstract class Transport {
this.arrayCopy(packet, 32, body, 0, body.length);
int encFlag = this.readInt(packet, 20);
if (encFlag == ENC_AES256 && this.aesKey != null) {
if (encFlag != ENC_NONE && this.aesKey != null) {
try
{
body = aesDecrypt(body);
@ -162,7 +163,7 @@ public abstract class Transport {
try
{
if (this.aesEnabled) {
encType = ENC_AES256;
encType = (this.aesKey.length == 32 ? ENC_AES256 : ENC_AES128);
data = aesEncrypt(data);
}
else

16
java/meterpreter/meterpreter/src/main/java/com/metasploit/meterpreter/core/core_negotiate_tlv_encryption.java

@ -1,18 +1,15 @@
package com.metasploit.meterpreter.core;
import javax.xml.bind.DatatypeConverter;
import java.security.KeyFactory;
import java.security.PublicKey;
import java.security.SecureRandom;
import java.security.spec.X509EncodedKeySpec;
import java.lang.String;
import javax.crypto.Cipher;
import com.metasploit.meterpreter.Transport;
import com.metasploit.meterpreter.Meterpreter;
import com.metasploit.meterpreter.TLVPacket;
import com.metasploit.meterpreter.TLVType;
import com.metasploit.meterpreter.Utils;
import com.metasploit.meterpreter.command.Command;
public class core_negotiate_tlv_encryption implements Command {
@ -21,9 +18,16 @@ public class core_negotiate_tlv_encryption implements Command {
public int execute(Meterpreter meterpreter, TLVPacket request, TLVPacket response) throws Exception {
byte[] der = request.getRawValue(TLVType.TLV_TYPE_RSA_PUB_KEY);
byte[] aesKey = new byte[32];
int encType;
byte[] aesKey;
if (Cipher.getMaxAllowedKeyLength("AES") < 256) {
encType = Transport.ENC_AES128;
aesKey = new byte[16];
} else {
encType = Transport.ENC_AES256;
aesKey = new byte[32];
}
sr.nextBytes(aesKey);
try
{
PublicKey pubKey = getPublicKey(der);
@ -35,7 +39,7 @@ public class core_negotiate_tlv_encryption implements Command {
{
response.add(TLVType.TLV_TYPE_SYM_KEY, aesKey);
}
response.add(TLVType.TLV_TYPE_SYM_KEY_TYPE, Transport.ENC_AES256);
response.add(TLVType.TLV_TYPE_SYM_KEY_TYPE, encType);
meterpreter.getTransports().current().setAesEncryptionKey(aesKey);