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Category:   Application (Web Server/CGI)  >   Apache HTTPD Vendors:   Apache Software Foundation
(Gentoo Issues Fix) Apache Web Server Socket Starvation Flaw May Let Remote Users Deny Service
SecurityTracker Alert ID:  1010300
SecurityTracker URL:  http://securitytracker.com/id/1010300
CVE Reference:   CVE-2004-0174   (Links to External Site)
Date:  May 26 2004
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): priot to 1.3.31
Description:   A vulnerability was reported in the Apache web server. A remote user may be able to cause denial of service conditions.

It is reported that a remote user can establish a short-lived connection to a rarely-accessed listening socket on the target server. This may cause the Apache child process to block new connections until another connection arrives on the rarely-accessed listening socket.

The report indicates that some versions of AIX, Solaris, and Tru64 UNIX are affected, but that FreeBSD and Linux systems are not affected.

Impact:   A remote user may be able to cause the target server to deny connection requests.
Solution:   Gentoo has released a fix and indicates that all users should upgrade to the latest stable version of Apache 1.3.

# emerge sync

# emerge -pv ">=net-www/apache-1.3.31"
# emerge ">=net-www/apache-1.3.31"

Vendor URL:  httpd.apache.org/ (Links to External Site)
Cause:   Resource error
Underlying OS:  Linux (Gentoo)

Message History:   This archive entry is a follow-up to the message listed below.
Mar 19 2004 Apache Web Server Socket Starvation Flaw May Let Remote Users Deny Service



 Source Message Contents

Subject:  [gentoo-announce] [ GLSA 200405-22 ] Apache 1.3: Multiple vulnerabilities



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Gentoo Linux Security Advisory                           GLSA 200405-22
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                                            http://security.gentoo.org/
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  Severity: Normal
     Title: Apache 1.3: Multiple vulnerabilities
      Date: May 26, 2004
      Bugs: #51815
        ID: 200405-22

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Synopsis
========

Several security vulnerabilites have been fixed in the latest release
of Apache 1.3.

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       < 1.3.31                           >= 1.3.31

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

On 64-bit big-endian platforms, mod_access does not properly parse
Allow/Deny rules using IP addresses without a netmask which could
result in failure to match certain IP addresses.

Terminal escape sequences are not filtered from error logs. This could
be used by an attacker to insert escape sequences into a terminal
emulater vulnerable to escape sequences.

mod_digest does not properly verify the nonce of a client response by
using a AuthNonce secret. This could permit an attacker to replay the
response of another website. This does not affect mod_auth_digest.

On certain platforms there is a starvation issue where listening
sockets fails to handle short-lived connection on a rarely-accessed
listening socket. This causes the child to hold the accept mutex and
block out new connections until another connection arrives on the same
rarely-accessed listening socket thus leading to a denial of service.

Impact
======

These vulnerabilities could lead to attackers bypassing intended access
restrictions, denial of service, and possibly execution of arbitrary
code.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All users should upgrade to the latest stable version of Apache 1.3.

    # emerge sync

    # emerge -pv ">=net-www/apache-1.3.31"
    # emerge ">=net-www/apache-1.3.31"

References
==========

  [ 1 ] CAN-2003-0993
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0993
  [ 2 ] CAN-2003-0020
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0020
  [ 3 ] CAN-2003-0987
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0987
  [ 4 ] CAN-2004-0174
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0174

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

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

     http://security.gentoo.org/glsa/glsa-200405-22.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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