SuSE alert SUSE-SA:2004:029 (zlib)
| From: | Thomas Biege <thomas@suse.de> | |
| To: | suse-security-announce@suse.com | |
| Subject: | [suse-security-announce] SUSE Security Announcement: zlib (SUSE-SA:2004:029) | |
| Date: | Thu, 02 Sep 2004 22:33:33 +0200 |
-----BEGIN PGP SIGNED MESSAGE----- ______________________________________________________________________________ SUSE Security Announcement Package: zlib Announcement-ID: SUSE-SA:2004:029 Date: Thursday, Sep 2nd 2004 17:30:00 MEST Affected products: 9.1 SUSE Linux Enterprise Server 9 Vulnerability Type: denial of service Severity (1-10): 3-5 SUSE default package: yes Cross References: CAN-2004-0797 VU#238678 Content of this advisory: 1) security vulnerability resolved: - denial of service condition in zlib 2) solution/workaround 3) special instructions and notes 4) package location and checksums 5) pending vulnerabilities, solutions, workarounds: - gaim - opera - imlib, imlib2 6) standard appendix (further information) ______________________________________________________________________________ 1) problem description, brief discussion zlib is a widely used data compression library. Programs linked against it include most desktop applications as well as servers such as Apache and OpenSSH. The 'inflate' function of zlib handles certain input data incorrectly which could lead to a denial of service condition for programs using it with untrusted data. Whether the vulnerability can be exploided locally or remotely depends on the application using it. zlib versions older than version 1.2 are not affected. 2) solution/workaround There is no known workaround. 3) special instructions and notes After applying the update all programs linked against libz must be restarted. 4) package location and checksums Please 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 to install from the maintenance web. x86 Platform: SUSE Linux 9.1: ftp://ftp.suse.com/pub/suse/i386/update/9.1/rpm/i586/zlib... 831b925bd07550e53fcef3657416675d ftp://ftp.suse.com/pub/suse/i386/update/9.1/rpm/i586/zlib... 10f7fb0af45b2c0fd436ddc8a2876697 patch rpm(s): ftp://ftp.suse.com/pub/suse/i386/update/9.1/rpm/i586/zlib... 4a0b7a87fc8ed9129b6d940d8b577aa7 ftp://ftp.suse.com/pub/suse/i386/update/9.1/rpm/i586/zlib... 75b7929b89794b07ae96ce6bb833fcb0 source rpm(s): ftp://ftp.suse.com/pub/suse/i386/update/9.1/rpm/src/zlib-... 1cb7920050dc98a04377837f626ebd33 x86-64 Platform: SUSE Linux 9.1: ftp://ftp.suse.com/pub/suse/x86_64/update/9.1/rpm/x86_64/... df1d74ebec5f74da7244ba8fff23feb0 ftp://ftp.suse.com/pub/suse/x86_64/update/9.1/rpm/x86_64/... 284ab472d375c567557a9256ca55cdc3 patch rpm(s): ftp://ftp.suse.com/pub/suse/x86_64/update/9.1/rpm/x86_64/... 7b49fd8bc2c06becd0aec7db62e4cd3d ftp://ftp.suse.com/pub/suse/x86_64/update/9.1/rpm/x86_64/... a62b558fd4f683eddce9615090ef01b4 source rpm(s): ftp://ftp.suse.com/pub/suse/x86_64/update/9.1/rpm/src/zli... 1ab725bb307b26a928edadfdb2d57cbc ______________________________________________________________________________ 5) Pending vulnerabilities in SUSE Distributions and Workarounds: - gaim Various buffer overflow conditions have been found in the gaim instant messenger. The MSN protocol parsing has already been fixed with the packages announced in the SUSE Security Announcement SUSE-SA:2004:025. The packages which fix the other pending bugs in gaim will be available on our FTP servers soon. - opera The web-browser opera is affected by several security bugs. New packages will soon be available on our FTP servers. - imlib, imlib2 Buffer overflows in the BMP image loader of imlib and imlib2 have been discovered. New packages will be available on our FTP servers soon. ______________________________________________________________________________ 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 <name-of-the-file.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 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 disrecommend to subscribe to security lists which cause the email 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 <file.rpm> to verify the signature of the package, where <file.rpm> is the filename of the rpm package that you have downloaded. Of course, package authenticity verification can only target an un-installed 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-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 email 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> respectively. ===================================================================== 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, 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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