CVE-2024-42367CWE-61

In aiohttp, compressed files as symlinks are not protected from path traversal

Medium · published August 9, 2024

CVSS v3.1
4.8
EPSS
1%
Percentile
50.5
In the wild
Unconfirmed
What it is

aiohttp is an asynchronous HTTP client/server framework for asyncio and Python. In versions on the 3.10 branch prior to version 3.10.2, static routes which contain files with compressed variants (`.gz` or `.br` extension) are vulnerable to path traversal outside the root directory if those variants are symbolic links. The server protects static routes from path traversal outside the root directory when `follow_symlinks=False` (default). It does this by resolving the requested URL to an absolute path and then checking that path relative to the root. However, these checks are not performed when looking for compressed variants in the `FileResponse` class, and symbolic links are then automatically followed when performing the `Path.stat()` and `Path.open()` to send the file. Version 3.10.2 contains a patch for the issue.

The record
Technical detail
CVSS v3.1
4.8 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
CVSS v4.0
Not supplied
EPSS
0.00650 · 50.5th percentile
Weakness
CWE-61 · UNIX Symbolic Link (Symlink) Following
Published
2024-08-09T17:25Z
EPSS history
Timeline
  • 09 AUG 17:25Z
    In aiohttp, compressed files as symlinks are not protected from path traversal
    cvelistv5