SUSE Security Announcement: squid (SUSE-SA:2005:006)

-----BEGIN PGP SIGNED MESSAGE----- ______________________________________________________________________________ SUSE Security Announcement Package: squid Announcement-ID: SUSE-SA:2005:006 Date: Thursday, Feb 10th 2005 13:30 MET Affected products: 8.1, 8.2, 9.0, 9.1, 9.2 SUSE Linux Enterprise Server 8, 9 Vulnerability Type: remote command execution Severity (1-10): 8 SUSE default package: no Cross References: CAN-2005-0094 CAN-2005-0095 CAN-2005-0096 CAN-2005-0097 CAN-2005-0173 CAN-2005-0174 CAN-2005-0175 CAN-2005-0211 CAN-2005-0241 Content of this advisory: 1) security vulnerability resolved: + buffer overflow in gopher parser + integer overflow in WCCP handling code + memory leak in the NTLM fakeauth_auth helper + denial-of-service in NTLM component + lax LDAP account name handling + cache poisoning by malformed HTTP packets + cache poisoning by splitted HTTP responses + buffer overflow in WCCP handling code + httpProcessReplyHeader function does not properly set the debug context problem description 2) solution/workaround 3) special instructions and notes 4) package location and checksums 5) pending vulnerabilities, solutions, workarounds: 6) standard appendix (further information) ______________________________________________________________________________ 1) problem description, brief discussion Squid is a feature-rich web-proxy with support for various web-related protocols. The last two squid updates from February the 1st and 10th fix several vulnerabilities. The impact of them range from remote denial-of-service over cache poisoning to possible remote command execution. Due to the hugh amount of bugs the vulnerabilities are just summarized here. CAN-2005-0094 A buffer overflow in the Gopher responses parser leads to memory corruption and usually crash squid. CAN-2005-0095 An integer overflow in the receiver of WCCP (Web Cache Communication Protocol) messages can be exploited remotely by sending a specially crafted UDP datagram to crash squid. CAN-2005-0096 A memory leak in the NTLM fakeauth_auth helper for Squid 2.5.STABLE7 and earlier allows remote attackers to cause a denial-of-service due to uncontrolled memory consumption. CAN-2005-0097 The NTLM component in Squid 2.5.STABLE7 and earlier allows remote attackers to cause a crash od squid by sending a malformed NTLM message. CAN-2005-0173 LDAP handles search filters very laxly. This behaviour can be abused to log in using several variants of a login name, possibly bypassing explicit access controls or confusing accounting. CAN-2005-0175 and CAN-2005-0174 Minor problems in the HTTP header parsing code that can be used for cache poisoning. CAN-2005-0211 A buffer overflow in the WCCP handling code in Squid 2.5 before 2.5.STABLE7 allows remote attackers to cause a denial-of-service and possibly execute arbitrary code by using a long WCCP packet. CAN-2005-0241 The httpProcessReplyHeader function in Squid 2.5-STABLE7 and earlier does not properly set the debug context when it is handling "oversized" HTTP reply headers. The impact is unknown. 2) solution/workaround There is no workaround known. 3) special instructions and notes Please make sure squid is restarted after the update. Execute 'rcsquid restart' as user root. 4) package location and checksums Download the update package for your distribution and verify its integrity by the methods listed in section 3) of this announcement. Then, install the package using the command "rpm -Fhv file.rpm" to apply the update. Our maintenance customers are being notified individually. The packages are being offered for installation from the maintenance web. x86 Platform: SUSE Linux 9.2: ftp://ftp.suse.com/pub/suse/i386/update/9.2/rpm/i586/squid-2.5.STABLE6-6.6.i586.rpm 1002a1c5d0841a698e76f6e9879b91e9 patch rpm(s): ftp://ftp.suse.com/pub/suse/i386/update/9.2/rpm/i586/squid-2.5.STABLE6-6.6.i586.patch.rpm 10f2257aa1238835ede8cd820a16c684 source rpm(s): ftp://ftp.suse.com/pub/suse/i386/update/9.2/rpm/src/squid-2.5.STABLE6-6.6.src.rpm 9d54a80127df60cad2b254c1e4a434b8 SUSE Linux 9.1: ftp://ftp.suse.com/pub/suse/i386/update/9.1/rpm/i586/squid-2.5.STABLE5-42.27.i586.rpm 95dc251f27d87496e73b74f15c8030c6 patch rpm(s): ftp://ftp.suse.com/pub/suse/i386/update/9.1/rpm/i586/squid-2.5.STABLE5-42.27.i586.patch.rpm f8b5486243cc2369c8f577fdc7ff3de2 source rpm(s): ftp://ftp.suse.com/pub/suse/i386/update/9.1/rpm/src/squid-2.5.STABLE5-42.27.src.rpm d8d805a1062e9759c21cd19affdcd3b5 SUSE Linux 9.0: ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/i586/squid-2.5.STABLE3-118.i586.rpm 8e94548f94fc7bf7f07ae2005fceb47e patch rpm(s): ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/i586/squid-2.5.STABLE3-118.i586.patch.rpm eec32d15c7a3ae21accb69d0c02cc8b2 source rpm(s): ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/src/squid-2.5.STABLE3-118.src.rpm 6d8a366925335c44a0727cf53a0062cf SUSE Linux 8.2: ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/i586/squid-2.5.STABLE1-106.i586.rpm 7457d43267f88b26faf83695c87eaf89 patch rpm(s): ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/i586/squid-2.5.STABLE1-106.i586.patch.rpm 8393c0a5791f0390030d86b71337c96e source rpm(s): ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/src/squid-2.5.STABLE1-106.src.rpm 189f57b8b006afdf3e13da058518491b SUSE Linux 8.1: ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/squid-2.4.STABLE7-288.i586.rpm 177fc495629e0b4d2c2e3f5fd92a8ed4 patch rpm(s): ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/squid-2.4.STABLE7-288.i586.patch.rpm 2bfe53711f0a4937760be18a5fe77189 source rpm(s): ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/src/squid-2.4.STABLE7-288.src.rpm 148c812936f32d9dfb14684f081efc8d x86-64 Platform: SUSE Linux 9.2: ftp://ftp.suse.com/pub/suse/x86_64/update/9.2/rpm/x86_64/squid-2.5.STABLE6-6.6.x86_64.rpm 5ea1d0c4217095aa6416fb5524d4f5ea patch rpm(s): ftp://ftp.suse.com/pub/suse/x86_64/update/9.2/rpm/x86_64/squid-2.5.STABLE6-6.6.x86_64.patch.rpm 44a8568ac14a2799cd2424088ab48a15 source rpm(s): ftp://ftp.suse.com/pub/suse/x86_64/update/9.2/rpm/src/squid-2.5.STABLE6-6.6.src.rpm 9d54a80127df60cad2b254c1e4a434b8 SUSE Linux 9.1: ftp://ftp.suse.com/pub/suse/x86_64/update/9.1/rpm/x86_64/squid-2.5.STABLE5-42.27.x86_64.rpm 928be9deeadb7d0c5abb02518225fd0b patch rpm(s): ftp://ftp.suse.com/pub/suse/x86_64/update/9.1/rpm/x86_64/squid-2.5.STABLE5-42.27.x86_64.patch.rpm 48acc169a1d84e77ad861517b12a49f6 source rpm(s): ftp://ftp.suse.com/pub/suse/x86_64/update/9.1/rpm/src/squid-2.5.STABLE5-42.27.src.rpm e3a8028984ea67f0b9becfd8d00e86eb SUSE Linux 9.0: ftp://ftp.suse.com/pub/suse/x86_64/update/9.0/rpm/x86_64/squid-2.5.STABLE3-118.x86_64.rpm f2501c3be9d3c1f70e65fe41628ef494 patch rpm(s): ftp://ftp.suse.com/pub/suse/x86_64/update/9.0/rpm/x86_64/squid-2.5.STABLE3-118.x86_64.patch.rpm 3b77d4262e1e8cbc4c71e8ec4aa48162 source rpm(s): ftp://ftp.suse.com/pub/suse/x86_64/update/9.0/rpm/src/squid-2.5.STABLE3-118.src.rpm 4f3fcad35b37467922a9d710c2ea84a2 ______________________________________________________________________________ 5) Pending vulnerabilities in SUSE Distributions and Workarounds: Please see the SUSE Security Summary Report. ______________________________________________________________________________ 6) standard appendix: authenticity verification, additional information - Package authenticity verification: SUSE update packages are available on many mirror ftp servers all over the world. While this service is being considered valuable and important to the free and open source software community, many users wish to be sure about the origin of the package and its content before installing the package. There are two verification methods that can be used independently from each other to prove the authenticity of a downloaded file or rpm package: 1) md5sums as provided in the (cryptographically signed) announcement. 2) using the internal gpg signatures of the rpm package. 1) execute the command md5sum after you downloaded the file from a SUSE ftp server or its mirrors. Then, compare the resulting md5sum with the one that is listed in the announcement. Since the announcement containing the checksums is cryptographically signed (usually using the key security@suse.de), the checksums show proof of the authenticity of the package. We recommend against subscribing to security lists that cause the e-mail message containing the announcement to be modified so that the signature does not match after transport through the mailing list software. Downsides: You must be able to verify the authenticity of the announcement in the first place. If RPM packages are being rebuilt and a new version of a package is published on the ftp server, all md5 sums for the files are useless. 2) rpm package signatures provide an easy way to verify the authenticity of an rpm package. Use the command rpm -v --checksig to verify the signature of the package, where is the file name of the rpm package that you have downloaded. Of course, package authenticity verification can only target an uninstalled rpm package file. Prerequisites: a) gpg is installed b) The package is signed using a certain key. The public part of this key must be installed by the gpg program in the directory ~/.gnupg/ under the user's home directory who performs the signature verification (usually root). You can import the key that is used by SUSE in rpm packages for SUSE Linux by saving this announcement to a file ("announcement.txt") and running the command (do "su -" to be root): gpg --batch; gpg < announcement.txt | gpg --import SUSE Linux distributions version 7.1 and thereafter install the key "build@suse.de" upon installation or upgrade, provided that the package gpg is installed. The file containing the public key is placed at the top-level directory of the first CD (pubring.gpg) and at ftp://ftp.suse.com/pub/suse/pubring.gpg-build.suse.de . - SUSE runs two security mailing lists to which any interested party may subscribe: suse-security@suse.com - general/linux/SUSE security discussion. All SUSE security announcements are sent to this list. To subscribe, send an email to . suse-security-announce@suse.com - SUSE's announce-only mailing list. Only SUSE's security announcements are sent to this list. To subscribe, send an email to . For general information or the frequently asked questions (faq) send mail to: or respectively. ===================================================================== SUSE's security contact is or . The public key is listed below. ===================================================================== ______________________________________________________________________________ The information in this advisory may be distributed or reproduced, provided that the advisory is not modified in any way. In particular, it is desired that the clear-text signature shows proof of the authenticity of the text. SUSE Linux AG makes no warranties of any kind whatsoever with respect to the information contained in this security advisory. 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