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SuSE alert SUSE-SA:2007:024 (gpg)

From:  Marcus Meissner <meissner@suse.de>
To:  suse-security-announce@suse.com
Subject:  [suse-security-announce] SUSE Security Announcement: gpg (SUSE-SA:2007:024)
Date:  Fri, 30 Mar 2007 16:05:42 +0200

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 ______________________________________________________________________________ SUSE Security Announcement Package: gpg Announcement ID: SUSE-SA:2007:024 Date: Fri, 30 Mar 2007 13:00:00 +0000 Affected Products: SUSE LINUX 9.3 SUSE LINUX 10.0 SUSE LINUX 10.1 openSUSE 10.2 UnitedLinux 1.0 SuSE Linux Enterprise Server 8 SuSE Linux Openexchange Server 4 SuSE Linux Desktop 1.0 SuSE Linux Standard Server 8 SuSE Linux School Server SUSE LINUX Retail Solution 8 SUSE SLES 9 Novell Linux Desktop 9 Open Enterprise Server Novell Linux POS 9 SUSE SLED 10 SUSE SLES 10 Vulnerability Type: signature bypassing Severity (1-10): 5 SUSE Default Package: yes Cross-References: CVE-2007-1263 Content of This Advisory: 1) Security Vulnerability Resolved: gpg signature bypassing 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 When printing a text stream with a GPG signature it was possible for an attacker to create a stream with "unsigned text, signed text" where both unsigned and signed text would be shown without distinction which one was signed and which part wasn't. This problem is tracked by the Mitre CVE ID CVE-2007-1263. The update introduces a new option --allow-multiple-messages to print out such messages in the future, by default it only prints and handles the first one. gpg2 and various clients using GPG to check digital signatures are affected too, but will be fixed separately. 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: openSUSE 10.2: ftp://ftp.suse.com/pub/suse/update/10.2/rpm/i586/gpg-1.4.... 7e8844844d89dec746bb0f2e6faecd4f SUSE LINUX 10.1: ftp://ftp.suse.com/pub/suse/update/10.1/rpm/i586/gpg-1.4.... 0a26653f3fa65d46e4e192539c7ace01 SUSE LINUX 10.0: ftp://ftp.suse.com/pub/suse/i386/update/10.0/rpm/i586/gpg... 758b8a3198153d484ec09a6b1d760fb2 SUSE LINUX 9.3: ftp://ftp.suse.com/pub/suse/i386/update/9.3/rpm/i586/gpg-... 447e593b1328e0a8c0900c525be488f5 Power PC Platform: openSUSE 10.2: ftp://ftp.suse.com/pub/suse/update/10.2/rpm/ppc/gpg-1.4.5... 2a709e1eb6a22ace9eeba678a771ccff SUSE LINUX 10.1: ftp://ftp.suse.com/pub/suse/update/10.1/rpm/ppc/gpg-1.4.2... 0258f25101194c8ed1d39511748baef5 SUSE LINUX 10.0: ftp://ftp.suse.com/pub/suse/i386/update/10.0/rpm/ppc/gpg-... d8c8873e538881723d7b98cafc6402ea x86-64 Platform: openSUSE 10.2: ftp://ftp.suse.com/pub/suse/update/10.2/rpm/x86_64/gpg-1.... 2535c0dd40a972c7e028ac0d60d00aeb SUSE LINUX 10.1: ftp://ftp.suse.com/pub/suse/update/10.1/rpm/x86_64/gpg-1.... 88ab493766d181b2aeb85e9ba41d0f04 SUSE LINUX 10.0: ftp://ftp.suse.com/pub/suse/i386/update/10.0/rpm/x86_64/g... c8abc6fc65e284c64f4259d8d50dd1b8 SUSE LINUX 9.3: ftp://ftp.suse.com/pub/suse/i386/update/9.3/rpm/x86_64/gp... 0c5aa6ad775f5746256d7960adbeb86b Sources: openSUSE 10.2: ftp://ftp.suse.com/pub/suse/update/10.2/rpm/src/gpg-1.4.5... 3fd3ae52f6a004a24d2fd4d822a88d67 SUSE LINUX 10.1: ftp://ftp.suse.com/pub/suse/update/10.1/rpm/src/gpg-1.4.2... b691ff4ff478979dfe5dc1e0f6534272 SUSE LINUX 10.0: ftp://ftp.suse.com/pub/suse/i386/update/10.0/rpm/src/gpg-... e05305b96b232bef94eaa06249471c51 SUSE LINUX 9.3: ftp://ftp.suse.com/pub/suse/i386/update/9.3/rpm/src/gpg-1... 9bc52a7b1845bbeb23858b92696fe67b Our maintenance customers are notified individually. The packages are offered for installation from the maintenance web: UnitedLinux 1.0 http://support.novell.com/techcenter/psdb/3fafef103902137... SuSE Linux Openexchange Server 4 http://support.novell.com/techcenter/psdb/3fafef103902137... Open Enterprise Server http://support.novell.com/techcenter/psdb/3fafef103902137... Novell Linux POS 9 http://support.novell.com/techcenter/psdb/3fafef103902137... Novell Linux Desktop 9 http://support.novell.com/techcenter/psdb/3fafef103902137... SuSE Linux Enterprise Server 8 http://support.novell.com/techcenter/psdb/3fafef103902137... SuSE Linux Standard Server 8 http://support.novell.com/techcenter/psdb/3fafef103902137... SuSE Linux School Server http://support.novell.com/techcenter/psdb/3fafef103902137... SUSE LINUX Retail Solution 8 http://support.novell.com/techcenter/psdb/3fafef103902137... SuSE Linux Desktop 1.0 http://support.novell.com/techcenter/psdb/3fafef103902137... SUSE SLES 10 http://support.novell.com/techcenter/psdb/3fafef103902137... SUSE SLED 10 http://support.novell.com/techcenter/psdb/3fafef103902137... SUSE SLES 9 http://support.novell.com/techcenter/psdb/3fafef103902137... ______________________________________________________________________________ 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: opensuse-security@opensuse.org - General Linux and SUSE security discussion. All SUSE security announcements are sent to this list. To subscribe, send an e-mail to <opensuse-security+subscribe@opensuse.org>. 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>. ===================================================================== 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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