Severity: Normal
Title: GMP: Buffer Overflow Vulnerability
Date: September 29, 2023
Bugs: #823804
ID: 202309-13

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Synopsis
=======
A buffer overflow vulnerability has been found in GMP which could result
in denial of service.

Background
=========
The GNU Multiple Precision Arithmetic Library is a library forarbitrary-
precision arithmetic on different types of numbers.

Affected packages
================
Package Vulnerable Unaffected
------------ ------------ ------------
dev-libs/gmp < 6.2.1-r2 >= 6.2.1-r2

Description
==========
There is an integer overflow leading to a buffer overflow when
processing untrusted input via GMP's mpz_inp_raw function.

Impact
=====
Untrusted input can cause a denial of service via segmentation fault.

Workaround
=========
Users can ensure no untrusted input is passed into GMP's mpz_inp_raw
function.

Resolution
=========
All GMP users should upgrade to the latest version:

# emerge --sync
# emerge --ask --oneshot --verbose ">Þv-libs/gmp-6.2.1-r2"

References
=========
[ 1 ] CVE-2021-43618
https://nvd.nist.gov/vuln/detail/CVE-2021-43618

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

https://security.gentoo.org/glsa/202309-13

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