CVE-2021-41277 PoC — Metabase 路径遍历漏洞

Description

CVE-2021-41277 can be extended to an SSRF 

介绍

# CVE-2021-41277_SSRF
CVE-2021-41277 can be extended to an SSRF 

## Description

[Metabase](https://github.com/metabase/metabase) is an open source data analytics platform. **Metabase versions < 0.40.5**  were affected by **CVE-2021-41277** which led to local file inclusion according to the [CVE description](https://cve.mitre.org/cgi-bin/cvename.cgi?name=2021-41277).

While analyzing the finding described in [Metabase Security Advisory](https://github.com/metabase/metabase/security/advisories/GHSA-w73v-6p7p-fpfr) and diffing the code, it seemed that it can be extended to an **SSRF** since URL Schemas were not filtered. 


### POC || GTFO 

First test is to try to call an external server. This would be successfully performed as shown below. A Metabase instance would call an external server.
![IMAGE ALT TEXT HERE](https://raw.githubusercontent.com/sasukeourad/CVE-2021-41277_SSRF/main/Pictures/ssrf_web.png)


Second test is to scan the internal network. It starts with making use of the LFI to identify the network:

![IMAGE ALT TEXT HERE](https://raw.githubusercontent.com/sasukeourad/CVE-2021-41277_SSRF/main/Pictures/lfi.png)

Then, various IP addresses, ports can be probed to identify running services

![IMAGE ALT TEXT HERE](https://raw.githubusercontent.com/sasukeourad/CVE-2021-41277_SSRF/main/Pictures/local_network.png)


Third test is to use a different schema. FTP to the resque. This would work too. Though it is important to note that Metabase does a good job forcing the response Content-Type which avoids escalating this attack to an RCE.

![IMAGE ALT TEXT HERE](https://raw.githubusercontent.com/sasukeourad/CVE-2021-41277_SSRF/main/Pictures/ftp2.png)


Finally, this vulnerability allows attackers to reach internal AWS, google cloud pages which can leak sensitive information as shown below:

![IMAGE ALT TEXT HERE](https://raw.githubusercontent.com/sasukeourad/CVE-2021-41277_SSRF/main/Pictures/aws2.png)

![IMAGE ALT TEXT HERE](https://raw.githubusercontent.com/sasukeourad/CVE-2021-41277_SSRF/main/Pictures/google_internal2.png)


#### Note!

This was responsibly disclosed to Metabase. I appreciate the response and professionalism of their security team.

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