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Gentoo Linux Security Advisory                           GLSA 202406-04
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                                           https://security.gentoo.org/
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 Severity: Normal
    Title: LZ4: Memory Corruption
     Date: June 22, 2024
     Bugs: #791952
       ID: 202406-04

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Synopsis
========

A vulnerability has been discovered in LZ4, which can lead to memory
corruption.

Background
==========

LZ4 is a lossless compression algorithm, providing compression speed >
500 MB/s per core, scalable with multi-cores CPU. It features an
extremely fast decoder, with speed in multiple GB/s per core, typically
reaching RAM speed limits on multi-core systems.

Affected packages
=================

Package       Vulnerable    Unaffected
------------  ------------  ------------
app-arch/lz4  < 1.9.3-r1    >= 1.9.3-r1

Description
===========

An attacker who submits a crafted file to an application linked with lz4
may be able to trigger an integer overflow, leading to calling of
memmove() on a negative size argument, causing an out-of-bounds write
and/or a crash.

Impact
======

The greatest impact of this flaw is to availability, with some potential
impact to confidentiality and integrity as well.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All LZ4 users should upgrade to the latest version:

  # emerge --sync
  # emerge --ask --oneshot --verbose ">=app-arch/lz4-1.9.3-r1"

References
==========

[ 1 ] CVE-2021-3520
      https://nvd.nist.gov/vuln/detail/CVE-2021-3520

Availability
============

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

 https://security.gentoo.org/glsa/202406-04

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 2024 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