===================================================================== CERT-Renater Note d'Information No. 2008/VULN598 _____________________________________________________________________ DATE : 17/12/2008 HARDWARE PLATFORM(S) : / OPERATING SYSTEM(S) : Solaris 10 running mod_proxy_http for Apache 2.0, mod_proxy_ftp for Apache 2.0. ====================================================================== http://sunsolve.sun.com/search/document.do?assetkey=1-66-247666-1 ______________________________________________________________________ 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 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 x86 Platform * Solaris 10 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 A final resolution is pending completion. 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. ====================================================================== ========================================================= Les serveurs de référence du CERT-Renater http://www.urec.fr/securite http://www.cru.fr/securite http://www.renater.fr ========================================================= + CERT-RENATER | tel : 01-53-94-20-44 + + 151 bd de l'Hopital | fax : 01-53-94-20-41 + + 75013 Paris | email: certsvp@renater.fr + =========================================================