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Gentoo Linux Security Advisory                           GLSA 202309-13
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                                           https://security.gentoo.org/
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 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 ">=dev-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
security@gentoo.org 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/