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Gentoo Linux Security Advisory                           GLSA 202012-22
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                                            https://security.gentoo.org/
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  Severity: Normal
     Title: HAProxy: Arbitrary code execution
      Date: December 24, 2020
      Bugs: #715944
        ID: 202012-22

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Synopsis
=======
A buffer overflow in HAProxy might allow an attacker to execute
arbitrary code.

Background
=========
HAProxy is a TCP/HTTP reverse proxy for high availability environments.

Affected packages
================
     -------------------------------------------------------------------
      Package              /     Vulnerable     /            Unaffected
     -------------------------------------------------------------------
   1  net-proxy/haproxy            < 2.1.4             >= 2.0.13:0/2.0
                                                              >= 2.1.4

Description
==========
It was discovered that HAProxy incorrectly handled certain HTTP/2
headers.

Impact
=====
A remote attacker, by sending a specially crafted HTTP/2 request, could
possibly execute arbitrary code with the privileges of the process, or
cause a Denial of Service condition.

Workaround
=========
Disable HTTP/2 support.

Resolution
=========
All HAProxy 2.0.x users should upgrade to the latest version:

   # emerge --sync
   # emerge --ask --oneshot --verbose ">=net-proxy/haproxy-2.0.13:0/2.0"

All other HAProxy users should upgrade to the latest version:

   # emerge --sync
   # emerge --ask --oneshot --verbose ">=net-proxy/haproxy-2.1.4"

References
=========
[ 1 ] CVE-2020-11100
       https://nvd.nist.gov/vuln/detail/CVE-2020-11100

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

  https://security.gentoo.org/glsa/202012-22

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/