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Gentoo Linux Security Advisory                           GLSA 202208-21
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                                           https://security.gentoo.org/
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 Severity: High
    Title: libebml: Heap buffer overflow vulnerability
     Date: August 14, 2022
     Bugs: #772272
       ID: 202208-21

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Synopsis
=======
A heap-based buffer overflow in libeml might allow attackers to execute
arbitrary code.

Background
=========
libebml is a C++ library to parse EBML files.

Affected packages
================
    -------------------------------------------------------------------
     Package              /     Vulnerable     /            Unaffected
    -------------------------------------------------------------------
  1  dev-libs/libebml           < 1.4.2                      >= 1.4.2

Description
==========
On 32bit builds of libebml, the length of a string is miscalculated,
potentially leading to an exploitable heap overflow.

Impact
=====
An attacker able to provide arbitrary input to libebml could achieve arbitrary code execution.

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

Resolution
=========
Users of libebml on 32 bit architectures should upgrade to the latest version:

  # emerge --sync
  # emerge --ask --oneshot --verbose ">=dev-libs/libebml-1.4.2"

References
=========
[ 1 ] CVE-2021-3405
      https://nvd.nist.gov/vuln/detail/CVE-2021-3405

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

 https://security.gentoo.org/glsa/202208-21

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 2022 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/