Date: 26 August 2004
References: ESB-2004.0653 ESB-2004.0769 ESB-2005.0632
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AUSCERT External Security Bulletin Redistribution
ESB-2004.0532 -- Sun Alert Notification 57628
Security Vulnerabilities in the Apache Web Server and Apache Modules
26 August 2004
AusCERT Security Bulletin Summary
Product: Apache 1.3.31 and prior
Publisher: Sun Microsystems
Operating System: Solaris 9
Impact: Execute Arbitrary Code/Commands
CVE Names: CAN-2004-0492 CAN-2004-0174 CAN-2003-0993
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DOCUMENT ID: 57628
SYNOPSIS: Security Vulnerabilities in the Apache Web Server and Apache
Sun(sm) Alert Notification
* Sun Alert ID: 57628
* Synopsis: Security Vulnerabilities in the Apache Web Server and
* Category: Security
* Product: Solaris
* BugIDs: 5048900, 5069902
* Avoidance: T-Patch
* State: Committed
* Date Released: 24-Aug-2004
* Date Closed:
* Date Modified:
A local or remote unprivileged user may be able execute arbitrary code
on Solaris 8 or Solaris 9 systems running Apache with privileges of
the Apache HTTP process, due to several security vulnerabilities in
the Apache Web Server and Apache Web Server modules.
The Apache HTTP process normally runs as the unprivileged uid "nobody"
(uid 60001). The ability to execute arbitrary code as the unprivileged
uid "nobody" may lead to modified web content, denial of service, or
These issues are described at the following sites:
The Change Log for Apache 1.3, at
CAN-2003-0987: "mod_digest issue" at
CAN-2003-0020: "filtering of data sent to errorlog" at
CAN-2004-0174: "possible denial of service" at
CAN-2003-0993: "mod_access on 64-bit platforms" at
CAN-2004-0492: "buffer overflow in mod_proxy" at
Note that Apache 1.3.31 addresses the first four of these five
security vulnerabilities. Additional changes were made to address
CAN-2004-0492 in Sun's version of Apache 1.3.31.
2. Contributing Factors
This issue can occur in the following releases:
* Solaris 8
* Solaris 9
* Solaris 8
* Solaris 9
A system is only vulnerable to this issue if Apache Web Server has
been configured and is running on the system. The following command
can be executed to check if the Apache(1M) httpd daemon is running on
$ /usr/bin/ps -ef | grep httpd
nobody 103892 102307 0 Jan 20 ? 0:27 /usr/apache/bin/httpd
Apache was not bundled with Solaris prior to Solaris 8. However,
customers who have built and/or installed a vulnerable version of
Apache on any version of Solaris are at risk. See the Apache web site
to download the latest version of Apache which addresses these issues.
Note also that CAN-2004-0492 is not fixed in a shipped version of
The vulnerabilities CAN-2003-0020, CAN-2004-0174, and CAN-2003-0993
are present in Apache Web Server versions 1.3 through 1.3.29. The
vulnerability CAN-2003-098 is present in Apache Web Server versions
1.3 through 1.3.30.
The vulnerability CAN-2004-0492 is present in Apache Web Server
versions 1.3 through 1.3.31. CAN-2004-0492 is addressed in the Apache
Web Server shipped in the patches described in this Sun Alert.
In order to determine the version of Apache installed, the following
command can be executed:
$ /usr/apache/bin/httpd -v
Server version: Apache/1.3.27 (Unix)
Server built: Nov 1 2002 16:16:41
There are no reliable symptoms that would indicate any of the
described issues have been exploited to gain unauthorized uid "nobody"
access to a host.
Preliminary T-patches are available for the following releases from
* Solaris 9 T-patch T113146-05.tar.Z
* Solaris 9 T-patch T114145-04.tar.Z
This document refers to one or more preliminary temporary patches
(T-Patches) which are designed to address the concerns identified
herein. Sun has limited experience with these patches due to their
preliminary nature. As such, you should only install the patches on
systems meeting the configurations described above. Sun may release
full patches at a later date, however, Sun is under no obligation
whatsoever to create, release, or distribute any such patch.
A final resolution is pending completion.
This Sun Alert notification is being provided to you on an "AS IS"
basis. This Sun Alert notification may contain information provided by
third parties. The issues described in this Sun Alert notification may
or may not impact your system(s). Sun makes no representations,
warranties, or guarantees as to the information contained herein. ANY
AND ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION
WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR
NON-INFRINGEMENT, ARE HEREBY DISCLAIMED. BY ACCESSING THIS DOCUMENT
YOU ACKNOWLEDGE THAT SUN SHALL IN NO EVENT BE LIABLE FOR ANY DIRECT,
INDIRECT, INCIDENTAL, PUNITIVE, OR CONSEQUENTIAL DAMAGES THAT ARISE
OUT OF YOUR USE OR FAILURE TO USE THE INFORMATION CONTAINED HEREIN.
This Sun Alert notification contains Sun proprietary and confidential
information. It is being provided to you pursuant to the provisions of
your agreement to purchase services from Sun, or, if you do not have
notification may only be used for the purposes contemplated by these
Copyright 2000-2004 Sun Microsystems, Inc., 4150 Network Circle, Santa
Clara, CA 95054 U.S.A. All rights reserved.
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