#VU96003 UNIX symbolic link following in aiohttp - CVE-2024-42367

Vulnerability identifier: #VU96003

Vulnerability risk: High

CVSSv4.0: 8 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2024-42367

CWE-ID: CWE-61

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
aiohttp
Other software / Other software solutions

Vendor: aio-libs

Description

The vulnerability allows a remote attacker to compromise the affected system.

The vulnerability exists due to a symlink following issue when handling static routes which contain files with compressed variants in the FileResponse class even when "follow_symlinks=False" is set. A remote attacker can pass a specially crafted file to the application and perform directory traversal attacks.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

aiohttp: 3.0.0 - 3.10.1

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External links
https://github.com/aio-libs/aiohttp/security/advisories/GHSA-jwhx-xcg6-8xhj
https://github.com/aio-libs/aiohttp/pull/8653
https://github.com/aio-libs/aiohttp/commit/ce2e9758814527589b10759a20783fb03b98339f
https://github.com/aio-libs/aiohttp/blob/e0ff5246e1d29b7710ab1a2bbc972b48169f1c05/aiohttp/web_fileresponse.py#L177
https://github.com/aio-libs/aiohttp/blob/e0ff5246e1d29b7710ab1a2bbc972b48169f1c05/aiohttp/web_urldispatcher.py#L674

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.