From thomas@suse.de Thu Aug 12 16:19:39 2004 From: Thomas Biege To: full-disclosure@lists.netsys.com Date: Thu, 12 Aug 2004 14:23:37 +0200 Subject: [Full-Disclosure] SUSE Security Announcement: gaim (SUSE-SA:2004:025) -----BEGIN PGP SIGNED MESSAGE----- ______________________________________________________________________________ SUSE Security Announcement Package: gaim Announcement-ID: SUSE-SA:2004:025 Date: Thursday, Aug 12th 2004 12:00 MEST Affected products: 9.1 Vulnerability Type: remote code execution Severity (1-10): 6 SUSE default package: No Cross References: CAN-2004-0500 Content of this advisory: 1) security vulnerability resolved: - buffer overflow in gaim problem description 2) solution/workaround 3) special instructions and notes 4) package location and checksums 5) pending vulnerabilities, solutions, workarounds: - KDE - mozilla/firefox - ethereal - arts 6) standard appendix (further information) ______________________________________________________________________________ 1) problem description, brief discussion Gaim is an instant messaging client which supports a wide range of protocols. Sebastian Krahmer of the SuSE Security Team discovered various remotely exploitable buffer overflows in the MSN-protocol parsing functions during a code review of the MSN protocol handling code. Remote attackers can execute arbitrary code as the user running the gaim client. The vulnerable code exists in SUSE Linux 9.1 only. 2) solution/workaround There is no known workaround. 3) special instructions and notes Before applying the update, all instances of the gaim client should be closed. 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/gaim-0.75-79.2.i586.rpm 860321d82ba69b52420f20a79d85e1cf patch rpm(s): ftp://ftp.suse.com/pub/suse/i386/update/9.1/rpm/i586/gaim-0.75-79.2.i586.patch.rpm 4f1fc5407a2edf9483103cf1e4c9667b source rpm(s): ftp://ftp.suse.com/pub/suse/i386/update/9.1/rpm/src/gaim-0.75-79.2.src.rpm 3944443b7a6739d24737eca93cc48e98 x86-64 Platform: SUSE Linux 9.1: ftp://ftp.suse.com/pub/suse/x86_64/update/9.1/rpm/x86_64/gaim-0.75-79.2.x86_64.rpm d6cf6e00d46bf3098f4b3a384e14b27f patch rpm(s): ftp://ftp.suse.com/pub/suse/x86_64/update/9.1/rpm/x86_64/gaim-0.75-79.2.x86_64.patch.rpm 35aa894e1a3f51fa4e210d0d01bfdd17 source rpm(s): ftp://ftp.suse.com/pub/suse/x86_64/update/9.1/rpm/src/gaim-0.75-79.2.src.rpm 02e49732c72aec9d928a01491bca68fd ______________________________________________________________________________ 5) Pending vulnerabilities in SUSE Distributions and Workarounds: - KDE The KDE libs package contained two occureneces of insecure handling of temporary files in the mcoputils code (Thanks to Andrew Tuitt for reporting this to us) and in the dcopserver code. These two bugs can be exploited locally to remove and/or overwrite files with the privileges of the user running a vulnerable KDE application. A bug in the kdebase3 package allows the content of unrelated browser windows to be modified. This issue may be used to trick users into entering sensitive informations on a malicious web-site. New packages will be available soon. - mozilla/firefox We are currently testing new mozilla/firefox packages that include several fixes for security-related bugs. New packages will be available soon. - ethereal It may be possible to make Ethereal crash or run arbitrary code by injecting a malformed packet or by convincing someone to read a malformed packet trace file. (CAN-2004-0633, CAN-2004-0634, CAN-2004-0635) New packages are available at our FTP servers. - arts This update removes an inconsistency in the comparsion of credentials while creating temporary files. This flaw can be exploited locally in conjunction with setuid Arts applications. (very unlikely) ______________________________________________________________________________ 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 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 to verify the signature of the package, where 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-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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