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AUSCERT External Security Bulletin Redistribution
ESB-2008.1131 -- [Solaris]
Security Vulnerabilities in the Apache 2.0 "mod_proxy_http" and
"mod_proxy_ftp" Modules may Lead to Denial of Service (DoS)
or Cross Site Scripting (XSS)
19 December 2008
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AusCERT Security Bulletin Summary
---------------------------------
Product: Apache 2.0
Publisher: Sun Microsystems
Operating System: Solaris
Impact: Execute Arbitrary Code/Commands
Denial of Service
Access: Remote/Unauthenticated
CVE Names: CVE-2008-2364 CVE-2008-2939
Ref: AA-2008.0131
AA-2008.0168
AA-2008.0183
AA-2008.0199
ESB-2008.0841
ESB-2008.0959
ESB-2008.1036
ESB-2008.1091
Original Bulletin:
http://sunsolve.sun.com/search/document.do?assetkey=1-66-247666-1
Revision History: December 19 2008: Resolution added
December 17 2008: Initial Release
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Solution Type: Sun Alert
Solution 247666 : Security Vulnerabilities in the Apache 2.0
"mod_proxy_http" and "mod_proxy_ftp" Modules may Lead to Denial of
Service (DoS) or Cross Site Scripting (XSS)
Bug ID: 6725791, 6737160
Product
Solaris 10 Operating System
Date of Workaround Release: 15-Dec-2008
Date of Resolved Release: 17-Dec-2008
SA Document Body
Security Vulnerabilities in the Apache 2.0 "mod_proxy_http" and
"mod_proxy_ftp" modules:
1. Impact
Two security vulnerabilities have been found in the Apache HTTP server
that affect the Apache 2.0 web server bundled with Solaris 10:
1. A Denial of Service (DoS) vulnerability in the "mod_proxy_http"
Apache server module (CVE-2008-2364), may allow a remote unprivileged
user who is in control of a web server to which requests may be
proxied, to cause a denial of service to the Apache
"httpd" process (or potentially to the system as a whole as the
application may consume excessive resources).
2. A Cross Site Scripting (CSS or XSS) vulnerability in the
"mod_proxy_ftp" Apache server module (CVE-2008-2939), may allow a
remote unprivileged user to inject arbitrary web script or HTML. This
may allow the unprivileged user to bypass access control and gain
access to unauthorized data.
These issues are described in the following documents:
CVE-2008-2364 at:
* http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-2364
CVE-2008-2939 at:
* http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-2939
2. Contributing Factors
These issues can occur in the following releases:
SPARC Platform
* Solaris 10 without patch 120543-12
x86 Platform
* Solaris 10 without patch 120544-12
Note 1: Solaris 8 and Solaris 9 do not include support for Apache 2.0
web server and therefore are not impacted by these issues.
Note 2: A system is only vulnerable to the described issues if the
Apache 2.0 web server has been configured and is running on the
system.
To determine if the Apache 2.0 web server is enabled, the following
SMF command can be used:
$ svcs svc:/network/http:apache2
STATE STIME FMRI
disabled Feb_02 svc:/network/http:apache2
Note 3: The "mod_proxy_http" vulnerability (CVE-2008-2364) only
affects systems that enable a forward proxy. This feature is disabled
by default and is very rarely used. To determine if the forward proxy
is enabled, run the following command for all of the configuration
files that define the running Apache 2.0 configuration:
$ grep "ProxyRequests" /etc/apache2/httpd.conf
ProxyRequests On
Note 4: "The mod_proxy_ftp" vulnerability (CVE-2008-2939) only affects
systems that enable FTP over HTTP proxying, and a forward proxy (see
note 3) or a reverse proxy is enabled. To determine if the FTP over
HTTP proxying is enabled, run the following command for all of the
configuration files that define the running Apache 2.0 configuration:
$ grep "mod_proxy_ftp" /etc/apache2/httpd.conf
LoadModule proxy_ftp_module libexec/mod_proxy_ftp.so
To determine if the reverse proxy is enabled, run the following
command for all of the configuration files that define the running
Apache 2.0 configuration:
$ grep "ProxyPass" /etc/apache2/httpd.conf
ProxyPass /foo http://foo.example.com/bar
3. Symptoms
If the first issue (CVE-2008-2364) is exploited, the Apache 2.0 web
server may be unresponsive, possibly consuming all available CPU or
memory resources.
Commands such as prstat(1M) can be used to determine the utilization
of system resources:
$ prstat -s cpu
[...]
There are no predictable symptoms that would indicate that the second
issue (CVE-2008-2939) has been exploited.
4. Workaround
To work around the "mod_proxy_http" issue (CVE-2008-2364), make sure
that the forward proxy is not enabled (see Note 3 in Section 2) in in
the Apache 2 "httpd.conf" file.
To work around the "mod_proxy_ftp" issue (CVE-2008-2939), make sure
that module "mod_proxy_ftp.so" is not loaded (see Note 4 in Section 2)
in the Apache 2 "httpd.conf" file.
5. Resolution
These issues are addressed in the following releases:
SPARC Platform
* Solaris 10 with patch 120543-12 or later
x86 Platform
* Solaris 10 with patch 120544-12 or later
For more information on Security Sun Alerts, see Technical
Instruction ID 213557.
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
such an agreement, the Sun.com Terms of Use. This Sun Alert
notification may only be used for the purposes contemplated by these
agreements.
Copyright 2000-2008 Sun Microsystems, Inc., 4150 Network Circle, Santa
Clara, CA 95054 U.S.A. All rights reserved
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