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SUSE: 2004-034 Critical: Remote Command Exec Risk in XFree86-libs

Chris Evans reported three vulnerabilities in libXpm which can Chris Evans reported three vulnerabilities in libXpm which can be exploited remotely by providing malformed XPM image files. be exploited remotely by providing malformed XPM image files. The function xpmParseColors() is vulnerable to an integer overflow and a stack-based buffer overflow. The functions ParseAndPutPixels() as well [More...]. -----BEGIN PGP SIGNED MESSAGE----- ______________________________________________________________________________ SUSE Security Announcement Package: XFree86-libs, xshared Announcement-ID: SUSE-SA:2004:034 Date: Friday, Sep 17th 2004 14:23 MEST Affected products: 8.1, 8.2, 9.0, 9.1 SUSE Linux Enterprise Server 8, 9 remote command execution Severity (1-10): 9 SUSE default package: yes Cross References: CAN-2004-0687 CAN-2004-0688 Content of this advisory: 1) security vulnerability resolved: - stack-based buffer overflow - integer overflow problem description 2) solution/workaround 3) special instructions and notes 4) package location and checksums 5) pending vulnerabilities, solutions, workarounds: - samba - a2ps - mozilla - mc - squid - gaim - nessus - konqueror 6) standard appendix (further information) ______________________________________________________________________________ 1) problem description, brief discussion Chris Evans reported three vulnerabilities in libXpm which can be exploited remotely by providing malformed XPM image files. The function xpmParseColors() is vulnerable to an integer overflow and a stack-based buffer overflow. The functionsParseAndPutPixels() as well as ParsePixels() is vulnerable to a stack-based buffer overflow too. Additionally Matthieu Herrb found two one-byte buffer overflows. 2) solution/workaround There is no workaround known. 3) special instructions and notes After you have updated your system it would be best to restart the X server to remove all running instances of vulnerable libXpm code from your computer's memory. 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: 3012c0528b52f9c32887469166d07c97 patch rpm(s): ff5ace1728b192c1be0ead104e7074a8 source rpm(s): e54b7716eecbadba26d29d808dfc253c SUSE Linux 9.0: 80960eb494a1448276e07b88bcdf93b9 patch rpm(s): ef4e99c7ab08ee6f4ae4e6f6020d036e source rpm(s): 5320885836408599cd154b98e9f11c44 SUSE Linux 8.2: c4c9e786460c73d25442aa0fbbbf3022 patch rpm(s): efa7c28f19acce67e82aae8b9beb5126 source rpm(s): d61403ce550e0873054ffe887f6406f3 SUSE Linux 8.1: edea41c34e213abf627d3a9388a1e35d patch rpm(s): 517062ac1548ce2eafc734534cef6ba4 source rpm(s): 5a840979d8615102e8cdad652608629d x86-64 Platform: SUSE Linux 9.1: b0686b3f2cc91167e596202aacd3294a patch rpm(s): 9fc1ff5c09f45843c94ed50da0110496 source rpm(s): faf725c1202d2b36ad9d85158b6c6479 SUSE Linux 9.0: 24ae6856520a90d0125c343f7e26201f patch rpm(s): c137982b3935200e1f114877003c1022 source rpm(s): bdf6c8d0f7f4d92f6de0d5429486fd5b ______________________________________________________________________________ 5) Pending vulnerabilities in SUSE Distributions and Workarounds: - samba This version fixes several bugs in the Samba suite including two denial-of-service (DoS) Vulnerabilities. Microsoft Windows XP clients with installed Service Pack 2 crash the Samba (smbd) process while printing. Using macros in the smb.conf 'log file' statement might lead to an infinite recursion. A wrong counter and pointer handling in samba-vscan leads to a crash of the Samba (smbd) process sometimes. A DoS bug in smbd may allow an unauthenticated user to cause smbd to spawn new processes, each one entering an infinite loop. After sending a sufficient amount of packets it is possible to exhaust the memory resources on the server. This issue is known as CAN-2004-0807. A DoS bug in nmbd may allow an attacker to remotely crash the nmbd daemon. This issue is known as CAN-2004-0808. New packages are available on our FTP servers. - a2ps This update fixes the handling of filenames that include shell meta- characters. Without this patch it was possible to execute shell commands via a2ps by providing a filename that includes meta- characters as an argument. New packages are available on our FTP servers. - mozilla We are in the process of releasing updates for mozilla (and related browsers), fixing various issues: CAN-2004-0597, CAN-2004-0718, CAN-2004-0722, CAN-2004-0757, CAN-2004-0758, CAN-2004-0759, CAN-2004- 0760, CAN-2004-0761, CAN-2004-0762, CAN-2004-0763, CAN-2004-0764 and CAN-2004-0765. We will give you concrete details in a separate mozilla advisory when the updates are available. - mc The console filesystem browser mc was found vulnerable to various meta-char attacks in the extfs perl and shell scripts. These bugs can be exploited by providing amalformed archive file to a victim user to execute shell commands with her/his privileges. (CAN-2004-0494) New packages will be available soon. - squid Certain malformed NTLMSSP packets can crash the NTLM helpers provided by Squid (CAN-2004-0832). New packages will be available soon. - gaim This security update fixes four security issues which are registered as: + CAN-2004-0754 An integer overflow in the groupware message handler exists in Gaim. + CAN-2004-0784 A shell escape vulnerability in the handling of smiley theme tar- ball filenames could lead to arbitrary command execution. + CAN-2004-0785 Buffer overflows in Gaim could lead to a denial of service or arbitrary code execution. Additionally a buffer overflow in the URL parsing code of gaim is fixed. This bug let to remote system compromise with the privileges of the user running gaim. - nessus The nessus-adduser creates temporary files in $TMPDIR in an insecure manner. New packages will be available soon. - konqueror Westpoint notified us about a cookie stealing problem in various web- browsers (). The already available kdelibs3 packages (announced in SUSE-SA:2004:026) include patches for this vulnerability. We would like to thank Westpoint for their cooperation. Other browsers (Mozilla, Opera, ...) will be updated as soon as possible. ______________________________________________________________________________ 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 verificationmethods 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 This email address is being protected from spambots. You need JavaScript enabled to view it.), 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 runningthe command (do "su -" to be root): gpg --batch; gpg < announcement.txt | gpg --import SUSE Linux distributions version 7.1 and thereafter install the key "This email address is being protected from spambots. You need JavaScript enabled to view it." 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 . - SUSE runs two security mailing lists to which any interested party may subscribe: This email address is being protected from spambots. You need JavaScript enabled to view it. - general/linux/SUSE security discussion. All SUSE security announcements are sent to this list. To subscribe, send an email to . This email address is being protected from spambots. You need JavaScript enabled to view it. - 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. ==================================================================== . Vulkan-extensions, xclient Alert: Serious vulnerabilities identified in libXext that may enable remote code execution. Immediate patching needed!. XFree86-libs, security advisory, SUSE Linux update, remote execution risk, buffer overflow. . Severity: Critical. LinuxSecurity.com Team

Sep 17, 2004 •Critical SuSE