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TUCoPS :: Web :: Apache :: hack0423.htm

Apache 2: Remote denial of service attack



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

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Gentoo Linux Security Advisory                           GLSA 200407-03
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                                            http://security.gentoo.org/ 
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  Severity: Normal
     Title: Apache 2: Remote denial of service attack
      Date: July 04, 2004
      Bugs: #55441
        ID: 200407-03

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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 

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