-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 ______________________________________________________________________________ SUSE Security Announcement Package: gpg,liby2util Announcement ID: SUSE-SA:2006:009 Date: Mon, 20 Feb 2006 18:00:00 +0000 Affected Products: SUSE LINUX 10.0 SUSE LINUX 9.3 Vulnerability Type: remote code execution Severity (1-10): 9 SUSE Default Package: yes Cross-References: CVE-2006-0455 Content of This Advisory: 1) Security Vulnerability Resolved: gpg incorrect signature checking Problem Description 2) Solution or Work-Around 3) Special Instructions and Notes 4) Package Location and Checksums 5) Pending Vulnerabilities, Solutions, and Work-Arounds: See SUSE Security Summary Report. 6) Authenticity Verification and Additional Information ______________________________________________________________________________ 1) Problem Description and Brief Discussion With certain handcraftable signatures GPG was returning a 0 (valid signature) when used on command-line with option --verify. This only affects GPG version 1.4.x, so it only affects SUSE Linux 9.3 and 10.0. Other SUSE Linux versions are not affected. This could make automated checkers, like for instance the patch file verification checker of the YaST Online Update, pass malicious patch files as correct. This is tracked by the Mitre CVE ID CVE-2006-0455. Also, the YaST Online Update script signature verification had used a feature which was lost in gpg 1.4.x, making it possible to supply any kind of script which would be thought correct. This would also allow code execution. Both attacks require an attacker either manipulating a YaST Online Update mirror or manipulating the network traffic between the mirror and your machine. 2) Solution or Work-Around There is no known workaround, please install the update packages. 3) Special Instructions and Notes None. 4) Package Location and Checksums The preferred method for installing security updates is to use the YaST Online Update (YOU) tool. YOU detects which updates are required and automatically performs the necessary steps to verify and install them. Alternatively, download the update packages for your distribution manually and verify their integrity by the methods listed in Section 6 of this announcement. Then install the packages using the command rpm -Fhv <file.rpm> to apply the update, replacing <file.rpm> with the filename of the downloaded RPM package. x86 Platform: SUSE LINUX 10.0: ftp://ftp.suse.com/pub/suse/i386/update/10.0/rpm/i586/gpg-1.4.2-5.2.i586.rpm f1422c0264ff3e270a56d03d4b47e762 ftp://ftp.suse.com/pub/suse/i386/update/10.0/rpm/i586/liby2util-2.12.9-0.3.i586.rpm 9a6f3ee339303f3efd92121dedf441aa ftp://ftp.suse.com/pub/suse/i386/update/10.0/rpm/i586/liby2util-devel-2.12.9-0.3.i586.rpm b504c0cf0f84039018ae1ac90d2e5292 SUSE LINUX 9.3: ftp://ftp.suse.com/pub/suse/i386/update/9.3/rpm/i586/gpg-1.4.0-4.2.i586.rpm fffa34f3034effa188cbeb942473e200 ftp://ftp.suse.com/pub/suse/i386/update/9.3/rpm/i586/liby2util-2.11.7-0.3.i586.rpm a321ab146d07c50cc69a91352ac28bf7 ftp://ftp.suse.com/pub/suse/i386/update/9.3/rpm/i586/liby2util-devel-2.11.7-0.3.i586.rpm 1215bcf8f061079dbe05b93b1d611818 Power PC Platform: SUSE LINUX 10.0: ftp://ftp.suse.com/pub/suse/i386/update/10.0/rpm/ppc/liby2util-2.12.9-0.3.ppc.rpm 287ef59b3aec2b9aaaba0e17a9cbba27 ftp://ftp.suse.com/pub/suse/i386/update/10.0/rpm/ppc/liby2util-devel-2.12.9-0.3.ppc.rpm f0bd4524c50c5e0a5613f70393ba4489 x86-64 Platform: SUSE LINUX 10.0: ftp://ftp.suse.com/pub/suse/i386/update/10.0/rpm/x86_64/liby2util-2.12.9-0.3.x86_64.rpm edcad55c6587b9322b5895f2e1ff3760 ftp://ftp.suse.com/pub/suse/i386/update/10.0/rpm/x86_64/liby2util-devel-2.12.9-0.3.x86_64.rpm c6b4a827e8ab4dc6d14608ceeb3e3385 SUSE LINUX 9.3: ftp://ftp.suse.com/pub/suse/i386/update/9.3/rpm/x86_64/liby2util-2.11.7-0.3.x86_64.rpm 7cd1425a429b4637b34aa675d4eeaa85 ftp://ftp.suse.com/pub/suse/i386/update/9.3/rpm/x86_64/liby2util-devel-2.11.7-0.3.x86_64.rpm 8d27157261b70a5bb51ab643d8dd1fe8 Sources: SUSE LINUX 10.0: ftp://ftp.suse.com/pub/suse/i386/update/10.0/rpm/src/gpg-1.4.2-5.2.src.rpm 5098f06cba2e38aa0b5181fb3f9cd7f3 ftp://ftp.suse.com/pub/suse/i386/update/10.0/rpm/src/liby2util-2.12.9-0.3.src.rpm 3107fb78311f00f01c484c1fa1ab26df SUSE LINUX 9.3: ftp://ftp.suse.com/pub/suse/i386/update/9.3/rpm/src/gpg-1.4.0-4.2.src.rpm 026b7d74d345815de958152305ffde09 ftp://ftp.suse.com/pub/suse/i386/update/9.3/rpm/src/liby2util-2.11.7-0.3.src.rpm 2663aecb5e77147aca6881bd92e570bb ______________________________________________________________________________ 5) Pending Vulnerabilities, Solutions, and Work-Arounds: See SUSE Security Summary Report. ______________________________________________________________________________ 6) Authenticity Verification and Additional Information - Announcement authenticity verification: SUSE security announcements are published via mailing lists and on Web sites. The authenticity and integrity of a SUSE security announcement is guaranteed by a cryptographic signature in each announcement. All SUSE security announcements are published with a valid signature. To verify the signature of the announcement, save it as text into a file and run the command gpg --verify <file> replacing <file> with the name of the file where you saved the announcement. The output for a valid signature looks like: gpg: Signature made <DATE> using RSA key ID 3D25D3D9 gpg: Good signature from "SuSE Security Team <security@suse.de>" where <DATE> is replaced by the date the document was signed. If the security team's key is not contained in your key ring, you can import it from the first installation CD. To import the key, use the command gpg --import gpg-pubkey-3d25d3d9-36e12d04.asc - Package authenticity verification: SUSE update packages are available on many mirror FTP servers all over the world. While this service is considered valuable and important to the free and open source software community, the authenticity and the integrity of a package needs to be verified to ensure that it has not been tampered with. 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) Using the internal gpg signatures of the rpm package 2) MD5 checksums as provided in this announcement 1) The internal rpm package signatures provide an easy way to verify the authenticity of an RPM package. Use the command rpm -v --checksig <file.rpm> to verify the signature of the package, replacing <file.rpm> with the filename of the RPM package downloaded. The package is unmodified if it contains a valid signature from build@suse.de with the key ID 9C800ACA. This key is automatically imported into the RPM database (on RPMv4-based distributions) and the gpg key ring of 'root' during installation. You can also find it on the first installation CD and at the end of this announcement. 2) If you need an alternative means of verification, use the md5sum command to verify the authenticity of the packages. Execute the command md5sum <filename.rpm> 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 SUSE security announcement. Because the announcement containing the checksums is cryptographically signed (by security@suse.de), the checksums show proof of the authenticity of the package if the signature of the announcement is valid. Note that the md5 sums published in the SUSE Security Announcements are valid for the respective packages only. Newer versions of these packages cannot be verified. - SUSE runs two security mailing lists to which any interested party may subscribe: suse-security@suse.com - General Linux and SUSE security discussion. All SUSE security announcements are sent to this list. To subscribe, send an e-mail to <suse-security-subscribe@suse.com>. 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 e-mail to <suse-security-announce-subscribe@suse.com>. For general information or the frequently asked questions (FAQ), send mail to <suse-security-info@suse.com> or <suse-security-faq@suse.com>. ===================================================================== SUSE's security contact is <security@suse.com> or <security@suse.de>. The <security@suse.de> 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, the clear text signature should show proof of the authenticity of the text. SUSE Linux Products GmbH provides no warranties of any kind whatsoever with respect to the information contained in this security advisory. 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