__________________________________________________________ The U.S. Department of Energy Computer Incident Advisory Capability ___ __ __ _ ___ / | /_\ / \___ __|__ / \ \___ __________________________________________________________ INFORMATION BULLETIN Squid ACL Bypass Vulnerability [Debian Security Advisory DSA-474-1] April 6, 2004 16:00 GMT Number O-108 [REVISED 15 Apr 2004] [REVISED 22 Apr 2004] ______________________________________________________________________________ PROBLEM: A vulnerability was found in Squid, an Internet object cache, that allows user access controls based on URLs to be bypassed. PLATFORM: Debian GNU/Linux 3.0 (woody) Red Hat Enterprise Linux AS, ES, WS (v. 2.1 and v.3) Red Hat Linux Advanced Workstation 2.1 for the Itanium Processor DAMAGE: Remote users would be able to access URLs that are supposed to be blocked by the Squid web proxy service. SOLUTION: Apply updated security packages. ______________________________________________________________________________ VULNERABILITY The risk is LOW. Users could access URLs that they are not ASSESSMENT: supposed to be able to access. ______________________________________________________________________________ LINKS: CIAC BULLETIN: http://www.ciac.org/ciac/bulletins/o-108.shtml ORIGINAL BULLETIN: http://www.debian.org/security/2004/dsa-474 ADDITIONAL LINKS: Red Hat Security Advisory RHSA-2004:133-12 https://rhn.redhat.com/errata/RHSA-2004-133.html SGI Security update #18 ftp://patches.sgi.com/support/free/security/advisories/ 20040404-01-U.asc CVE/CAN: http://www.cve.mitre.org/cgi-bin/cvename.cgi?name= CVE-2004-0189 ______________________________________________________________________________ REVISION HISTORY: 04/15/04 - added link to Red Hat Security Advisory RHSA:2004:133-12 - Updated squid package fixes security vulnerability. 04/22/04 - added link to SGI Security update #18 for SGI patches now released. [***** Start Debian Security Advisory DSA-474-1 *****] Debian Security Advisory DSA-474-1 squid -- ACL bypass Date Reported: 03 Apr 2004 Affected Packages: squid Vulnerable: Yes Security database references: In Mitre's CVE dictionary: CAN-2004-0189. More information: A vulnerability was discovered in squid, an Internet object cache, whereby access control lists based on URLs could be bypassed (CAN-2004-0189). Two other bugs were also fixed with patches squid-2.4.STABLE7-url_escape.patch (a buffer overrun which does not appear to be exploitable) and squid-2.4. STABLE7-url_port.patch (a potential denial of service). For the stable distribution (woody) these problems have been fixed in version 2.4.6-2woody2. For the unstable distribution (sid) these problems have been fixed in version 2.5.5-1. We recommend that you update your squid package. Fixed in: Debian GNU/Linux 3.0 (woody) Source: http://security.debian.org/pool/updates/main/s/squid/squid_2.4.6-2woody2.dsc http://security.debian.org/pool/updates/main/s/squid/squid_2.4.6-2 woody2.diff.gz http://security.debian.org/pool/updates/main/s/squid/squid_2.4.6.orig.tar.gz Alpha: http://security.debian.org/pool/updates/main/s/squid/squid_2.4.6-2 woody2_alpha.deb http://security.debian.org/pool/updates/main/s/squid/squid-cgi_2.4.6-2 woody2_alpha.deb http://security.debian.org/pool/updates/main/s/squid/squidclient_2.4.6-2 woody2_alpha.deb ARM: http://security.debian.org/pool/updates/main/s/squid/squid_2.4.6-2 woody2_arm.deb http://security.debian.org/pool/updates/main/s/squid/squid-cgi_2.4.6-2 woody2_arm.deb http://security.debian.org/pool/updates/main/s/squid/squidclient_2.4.6-2 woody2_arm.deb Intel IA-32: http://security.debian.org/pool/updates/main/s/squid/squid_2.4.6-2 woody2_i386.deb http://security.debian.org/pool/updates/main/s/squid/squid-cgi_2.4.6-2 woody2_i386.deb http://security.debian.org/pool/updates/main/s/squid/squidclient_2.4.6-2 woody2_i386.deb Intel IA-64: http://security.debian.org/pool/updates/main/s/squid/squid_2.4.6-2 woody2_ia64.deb http://security.debian.org/pool/updates/main/s/squid/squid-cgi_2.4.6-2 woody2_ia64.deb http://security.debian.org/pool/updates/main/s/squid/squidclient_2.4.6-2 woody2_ia64.deb HPPA: http://security.debian.org/pool/updates/main/s/squid/squid_2.4.6-2 woody2_hppa.deb http://security.debian.org/pool/updates/main/s/squid/squid-cgi_2.4.6-2 woody2_hppa.deb http://security.debian.org/pool/updates/main/s/squid/squidclient_2.4.6-2 woody2_hppa.deb Motorola 680x0: http://security.debian.org/pool/updates/main/s/squid/squid_2.4.6-2 woody2_m68k.deb http://security.debian.org/pool/updates/main/s/squid/squid-cgi_2.4.6-2 woody2_m68k.deb http://security.debian.org/pool/updates/main/s/squid/squidclient_2.4.6-2 woody2_m68k.deb Big endian MIPS: http://security.debian.org/pool/updates/main/s/squid/squid_2.4.6-2 woody2_mips.deb http://security.debian.org/pool/updates/main/s/squid/squid-cgi_2.4.6-2 woody2_mips.deb http://security.debian.org/pool/updates/main/s/squid/squidclient_2.4.6-2 woody2_mips.deb Little endian MIPS: http://security.debian.org/pool/updates/main/s/squid/squid_2.4.6-2 woody1_mipsel.deb http://security.debian.org/pool/updates/main/s/squid/squid-cgi_2.4.6-2 woody1_mipsel.deb http://security.debian.org/pool/updates/main/s/squid/squidclient_2.4.6-2 woody1_mipsel.deb PowerPC: http://security.debian.org/pool/updates/main/s/squid/squid_2.4.6-2 woody2_powerpc.deb http://security.debian.org/pool/updates/main/s/squid/squid-cgi_2.4.6-2 woody2_powerpc.deb http://security.debian.org/pool/updates/main/s/squid/squidclient_2.4.6-2 woody2_powerpc.deb IBM S/390: http://security.debian.org/pool/updates/main/s/squid/squid_2.4.6-2 woody2_s390.deb http://security.debian.org/pool/updates/main/s/squid/squid-cgi_2.4.6-2 woody2_s390.deb http://security.debian.org/pool/updates/main/s/squid/squidclient_ 2.4.6-2woody2_s390.deb Sun Sparc: http://security.debian.org/pool/updates/main/s/squid/squid_2.4.6-2 woody2_sparc.deb http://security.debian.org/pool/updates/main/s/squid/squid-cgi_2.4.6-2 woody2_sparc.deb http://security.debian.org/pool/updates/main/s/squid/squidclient_2.4.6-2 woody2_sparc.deb MD5 checksums of the listed files are available in the original advisory. [***** End Debian Security Advisory DSA-474-1 *****] _______________________________________________________________________________ CIAC wishes to acknowledge the contributions of Debian for the information contained in this bulletin. _______________________________________________________________________________ CIAC, the Computer Incident Advisory Capability, 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 can be contacted at: Voice: +1 925-422-8193 (7x24) FAX: +1 925-423-8002 STU-III: +1 925-423-2604 E-mail: ciac@ciac.org Previous CIAC notices, anti-virus software, and other information are available from the CIAC Computer Security Archive. World Wide Web: http://www.ciac.org/ 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 communities, please contact your agency's response team to report incidents. Your agency's team will coordinate with CIAC. The Forum of 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 legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial products, process, or service by trade name, trademark, manufacturer, or otherwise, does not necessarily constitute or imply its endorsement, recommendation or favoring by the United States Government or the University of California. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or the University of California, and shall not be used for advertising or product endorsement purposes. LAST 10 CIAC BULLETINS ISSUED (Previous bulletins available from CIAC) O-098: NetScreen IVE Vulnerability may lead to Remote Script Execution O-099: Sun Basic Security Module Auditing Functionality Vulnerability O-100: Certificate Compromise using HP HTTP Server O-101: OpenSSL Denial of Service Vulnerability O-102: IBM AIX rexecd Vulnerability O-103: Apache HTTP Server mod_access Information Disclosure O-104: ICQ Parsing in ISS Products May Lead to Buffer Overflow O-105: Multiple Vulnerabilities in Ethereal 0.10.2 O-106: Mozilla 1.4 Vulnerabilities O-107: vfte Buffer Overflow Vulnerabilities