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The U.S. Department of Energy
Computer Incident Advisory Center
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INFORMATION BULLETIN
Apache HTTP Server on Win32 Vulnerability
[CERT Vulnerability Note VU#124003]
April 23, 2002 21:00 GMT Number M-070
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PROBLEM: A vulnerability has been identified in the Apache HTTP Server
running on Win32 systems.
PLATFORM: The following Win32 systems running Apache HTTP Servers:
Windows 9x, Windows Me, Windows NT/2000/XP.
DAMAGE: An unauthenticated, remote attacker could execute commands on
the vulnerable server with the privileges of the Apache
process.
SOLUTION: Upgrade to Apache 1.3.24 or 2.0.34-beta.
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VULNERABILITY The risk is HIGH. The vulnerability allows remote command
ASSESSMENT: execution and arbitrary file viewing.
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LINKS:
CIAC BULLETIN: http://www.ciac.org/ciac/bulletins/m-070.shtml
ORIGINAL BULLETIN: http://www.kb.cert.org/vuls/id/124003
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[***** Start CERT Vulnerability Note VU#124003 *****]
CERT Vulnerability Note VU#124003
Apache HTTP Server on Win32 systems does not securely handle input passed
to CGI programs
Overview
A vulnerability in the Apache HTTP Server running on Win32 systems
(Windows 9x/Me, Windows NT/2000/XP) could allow an attacker to execute
commands with the privileges of the web server process.
I. Description
The Apache HTTP Server is a freely available web server that runs on a
variety of operating systems including Unix, Linux, and Microsoft Windows
(Win32). Apache supports the Common Gateway Interface (CGI) that defines
a standard interface between the HTTP server and external applications.
On Win32 systems, batch or command shell programs (files typically with
.bat or .cmd extensions) can be executed via the CGI interface, and these
programs are executed within a full command shell (command.com on
Windows 9x/Me, cmd.exe in Windows NT/2000/XP).
Ory Segal of Sanctum has reported a vulnerability in which Apache on Win32
does not securely handle the arguments passed to batch or command shell
CGI programs. By crafting a CGI request containing the "|" (pipe)
character, an attacker can cause the program to execute arbitrary
commands with the privileges of the Apache process. By default, Apache
is installed with local SYSTEM privileges in Windows NT, 2000, and XP.
In Windows 9x/Me, all programs including Apache run with full privileges.
II. Impact
An unauthenticated, remote attacker could execute commands on the
vulnerable server with the privileges of the Apache process. By default,
Apache runs with local SYSTEM privileges in Windows NT, 2000, and XP.
In Windows 9x/Me, Apache runs with full privileges.
III. Solution
Upgrade Apache
This vulnerability is resolved in Apache 1.3.24 and 2.0.34-beta. Please
see the release Announcement for version 1.3.24. The Apache HTTP Server
is available from the Apache web site.
Run Apache with User privileges
On Windows NT, 2000, and XP systems, the Apache service can be configured
to run as a specified user instead of local SYSTEM. By carefully
specifying the privileges of the Apache user, an administrator can
restrict the ability of a CGI program to access files and execute commands.
Systems Affected
Vendor Status Date Updated
Apache Vulnerable 11-Apr-2002
References
http://www.apache.org/dist/httpd/
http://www.apache.org/dist/httpd/CHANGES_1.3
http://www.apache.org/dist/httpd/Announcement.html
http://www.securityfocus.com/bid/4335
http://online.securityfocus.com/archive/1/263370
http://www.w3.org/CGI/
http://hoohoo.ncsa.uiuc.edu/cgi/
Credit
The CERT/CC acknowledges Ory Segal for reporting this vulnerability.
This document was written by Art Manion.
Other Information
Date Public 03/21/2002
Date First Published 04/11/2002 10:43:48 AM
Date Last Updated 04/22/2002
CERT Advisory
CVE Name CAN-2002-0061
Metric 11.06
Document Revision 17
[***** End CERT Vulnerability Note VU#124003 *****]
_______________________________________________________________________________
CIAC wishes to acknowledge the contributions of CERT and Ory Segal for the
information contained in this bulletin.
_______________________________________________________________________________
CIAC, the Computer Incident Advisory Center, is the computer
security incident response team for the U.S. Department of Energy
(DOE) and the emergency backup response team for the National
Institutes of Health (NIH). CIAC is located at the Lawrence Livermore
National Laboratory in Livermore, California. CIAC is also a founding
member of FIRST, the Forum of Incident Response and Security Teams, a
global organization established to foster cooperation and coordination
among computer security teams worldwide.
CIAC services are available to DOE, DOE contractors, and the NIH. CIAC
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E-mail: ciac@ciac.org
Previous CIAC notices, anti-virus software, and other information are
available from the CIAC Computer Security Archive.
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Anonymous FTP: ftp.ciac.org
PLEASE NOTE: Many users outside of the DOE, ESnet, and NIH computing
communities receive CIAC bulletins. If you are not part of these
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Incident Response and Security Teams (FIRST) is a world-wide
organization. A list of FIRST member organizations and their
constituencies can be obtained via WWW at http://www.first.org/.
This document was prepared as an account of work sponsored by an
agency of the United States Government. Neither the United States
Government nor the University of California nor any of their
employees, makes any warranty, express or implied, or assumes any
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