Severity: High
Title: GNU Libmicrohttpd: Buffer Overflow Vulnerability
Date: November 25, 2023
Bugs: #778296
ID: 202311-08

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Synopsis
=======
A buffer overflow vulnerability has been discovered in GNU
Libmicrohttpd.

Background
=========
GNU libmicrohttpd is a small C library that makes it easy to run an HTTP
server as part of another application. GNU Libmicrohttpd is free
software and part of the GNU project.

Affected packages
================
Package Vulnerable Unaffected
---------------------- ------------ ------------
net-libs/libmicrohttpd = 0.9.70 > 0.9.70

Description
==========
A buffer overflow vulnerability has been discovered in GNU
Libmicrohttpd. Please review the CVE identifier referenced below for
details.

Impact
=====
A missing bounds check in the post_process_urlencoded function leads to
a buffer overflow, allowing a remote attacker to write arbitrary data in
an application that uses libmicrohttpd. The highest threat from this
vulnerability is to data confidentiality and integrity as well as system
availability.

Workaround
=========
There is no known workaround at this time.

Resolution
=========
All GNU Libmicrohttpd users should upgrade to the latest version:

# emerge --sync
# emerge --ask --oneshot --verbose ">net-libs/libmicrohttpd-0.9.70"

References
=========
[ 1 ] CVE-2021-3466
https://nvd.nist.gov/vuln/detail/CVE-2021-3466

Availability
===========
This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:

https://security.gentoo.org/glsa/202311-08

Concerns?
========
Security is a primary focus of Gentoo Linux and ensuring the
confidentiality and security of our users' machines is of utmost
importance to us. Any security concerns should be addressed to
[email protected] or alternatively, you may file a bug at
https://bugs.gentoo.org.

License
======
Copyright 2023 Gentoo Foundation, Inc; referenced text
belongs to its owner(s).

The contents of this document are licensed under the
Creative Commons - Attribution / Share Alike license.

https://creativecommons.org/licenses/by-sa/2.5