[ GLSA 200407-03 ] Apache 2: Remote denial of service attack

[Thierry Carrez <koon () gentoo org>]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Gentoo Linux Security Advisory                           GLSA 200407-03
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
                                            http://security.gentoo.org/
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

  Severity: Normal
     Title: Apache 2: Remote denial of service attack
      Date: July 04, 2004
      Bugs: #55441
        ID: 200407-03

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

Synopsis
========

A bug in Apache may allow a remote attacker to perform a Denial of
Service attack. With certain configurations this could lead to a heap
based buffer overflow.

Background
==========

The Apache HTTP Server Project is an effort to develop and maintain an
open-source HTTP server for modern operating systems. The goal of this
project is to provide a secure, efficient and extensible server that
provides services in tune with the current HTTP standards.

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

    -------------------------------------------------------------------
     Package         /    Vulnerable    /                   Unaffected
    -------------------------------------------------------------------
  1  net-www/apache      <= 2.0.49-r3                     >= 2.0.49-r4
                                                                   < 2

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

A bug in the protocol.c file handling header lines will cause Apache to
allocate memory for header lines starting with TAB or SPACE.

Impact
======

An attacker can exploit this vulnerability to perform a Denial of
Service attack by causing Apache to exhaust all memory. On 64 bit
systems with more than 4GB of virtual memory a possible integer
signedness error could lead to a buffer based overflow causing Apache
to crash and under some circumstances execute arbitrary code as the
user running Apache, usually "apache".

Workaround
==========

There is no known workaround at this time. All users are encouraged to
upgrade to the latest available version:

Resolution
==========

Apache 2 users should upgrade to the latest version of Apache:

    # emerge sync

    # emerge -pv ">=net-www/apache-2.0.49-r4"
    # emerge ">=net-www/apache-2.0.49-r4"

References
==========

  [ 1 ] Georgi Guninski security advisory #70, 2004
        http://www.guninski.com/httpd1.html
  [ 2 ] CAN-2004-0493
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0493

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

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

    http://security.gentoo.org/glsa/glsa-200407-03.xml

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
http://bugs.gentoo.org.

License
=======

Copyright 2004 Gentoo Technologies, Inc; referenced text
belongs to its owner(s).

The contents of this document are licensed under the
Creative Commons - Attribution / Share Alike license.

http://creativecommons.org/licenses/by-sa/1.0

-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.2.4 (GNU/Linux)
Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org

iD8DBQFA6F1fvcL1obalX08RAhz9AKCPeuWIsRNOW23muPm9Wg8o+4DsIgCeIKFG
tLPdwSIV5gDVQeZB8jcxozo=
=1rY3
-----END PGP SIGNATURE-----

_______________________________________________
Full-Disclosure - We believe in it.
Charter: http://lists.netsys.com/full-disclosure-charter.html