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Gentoo Linux Security Advisory                           GLSA 202003-44
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                                           https://security.gentoo.org/
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 Severity: High
    Title: Binary diff: Heap-based buffer overflow
     Date: March 19, 2020
     Bugs: #701848
       ID: 202003-44

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

Background
=========
bsdiff and bspatch are tools for building and applying patches to
binary files.

Affected packages
================
    -------------------------------------------------------------------
     Package              /     Vulnerable     /            Unaffected
    -------------------------------------------------------------------
  1  dev-util/bsdiff              < 4.3-r4                  >= 4.3-r4

Description
==========
It was discovered that the implementation of bspatch did not check for
a negative value on numbers of bytes read from the diff and extra
streams.

Impact
=====
A remote attacker could entice a user to apply a specially crafted
patch using bspatch, possibly resulting in execution of arbitrary code
with the privileges of the process or a Denial of Service condition.

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

Resolution
=========
All Binary diff users should upgrade to the latest version:

  # emerge --sync
  # emerge --ask --oneshot --verbose ">=dev-util/bsdiff-4.3-r4"

References
=========
[ 1 ] CVE-2014-9862
      https://nvd.nist.gov/vuln/detail/CVE-2014-9862

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

 https://security.gentoo.org/glsa/202003-44

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 2020 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/