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MDKSA-2003:085 - Updated gdm packages fix vulnerabilities
From: Mandrake Linux Security Team <security () linux-mandrake com>
Date: 22 Aug 2003 00:10:27 -0000
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 ________________________________________________________________________ Mandrake Linux Security Update Advisory ________________________________________________________________________ Package name: gdm Advisory ID: MDKSA-2003:085 Date: August 21st, 2003 Affected versions: 9.0, 9.1, Corporate Server 2.1 ________________________________________________________________________ Problem Description: Several vulnerabilities were discovered in versions of gdm prior to 2.4.1.6. The first vulnerability is that any user can read any text file on the system due to code originally written to be run as the user logging in was in fact being run as the root user. This code is what allows the examination of the ~/.xsession-errors file. If a user makes a symlink from this file to any other file on the system during the session and ensures that the session lasts less than ten seconds, the user can read the file provided it was readable as a text file. Another two vulnerabilities were found in the XDMCP code that could be exploited to crash the main gdm daemon which would inhibit starting any new sessions (although the current session would be unaffected). The first problem here is due to the indirect query structure being used right after being freed due to a missing 'continue' statement in a loop; this happens if a choice of server expired and the client tried to connect. The second XDMCP problem is that when authorization data is being checked as a string, the length is not checked first. If the data is less than 18 bytes long, the daemon may wander off the end of the string a few bytes in the strncmp which could cause a SEGV. These updated packages bring gdm to version 2.4.1.6 which is not vulnerable to any of these problems. Also note that XDMCP support is disabled by default in gdm. ________________________________________________________________________ References: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0547 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0548 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0549 ________________________________________________________________________ Updated Packages: Corporate Server 2.1: 47a2d84bfff0e842657e789e085b434d corporate/2.1/RPMS/gdm-2.4.1.6-0.2mdk.i586.rpm 8536d89374219e42ad6ca6c441ffb0d1 corporate/2.1/RPMS/gdm-Xnest-2.4.1.6-0.2mdk.i586.rpm 35ab7f8231548f1daa4571bfb5e77054 corporate/2.1/SRPMS/gdm-2.4.1.6-0.2mdk.src.rpm Corporate Server 2.1/x86_64: 252fc231c85e88411ca50a05f0404688 x86_64/corporate/2.1/RPMS/gdm-2.4.1.6-0.2mdk.x86_64.rpm 3f8b47c14e0d7fc4c2d76171e3ee0b5a x86_64/corporate/2.1/RPMS/gdm-Xnest-2.4.1.6-0.2mdk.x86_64.rpm 35ab7f8231548f1daa4571bfb5e77054 x86_64/corporate/2.1/SRPMS/gdm-2.4.1.6-0.2mdk.src.rpm Mandrake Linux 9.0: 47a2d84bfff0e842657e789e085b434d 9.0/RPMS/gdm-2.4.1.6-0.2mdk.i586.rpm 8536d89374219e42ad6ca6c441ffb0d1 9.0/RPMS/gdm-Xnest-2.4.1.6-0.2mdk.i586.rpm 35ab7f8231548f1daa4571bfb5e77054 9.0/SRPMS/gdm-2.4.1.6-0.2mdk.src.rpm Mandrake Linux 9.1: 9d8a97cc5f475f16eeb73caa9d7d8e6b 9.1/RPMS/gdm-2.4.1.6-0.3mdk.i586.rpm 4f866c5b5b4903d1b0751bcb6dc28d0f 9.1/RPMS/gdm-Xnest-2.4.1.6-0.3mdk.i586.rpm 91f0ff2421135e32f604d6cb82081439 9.1/SRPMS/gdm-2.4.1.6-0.3mdk.src.rpm Mandrake Linux 9.1/PPC: 0cb8fbd74766c4d0036cab36d57b6081 ppc/9.1/RPMS/gdm-2.4.1.6-0.3mdk.ppc.rpm fb0df358c4d6c9a7cf3982c4d3258004 ppc/9.1/RPMS/gdm-Xnest-2.4.1.6-0.3mdk.ppc.rpm 91f0ff2421135e32f604d6cb82081439 ppc/9.1/SRPMS/gdm-2.4.1.6-0.3mdk.src.rpm ________________________________________________________________________ Bug IDs fixed (see https://qa.mandrakesoft.com for more information): ________________________________________________________________________ To upgrade automatically, use MandrakeUpdate or urpmi. The verification of md5 checksums and GPG signatures is performed automatically for you. A list of FTP mirrors can be obtained from: http://www.mandrakesecure.net/en/ftp.php All packages are signed by MandrakeSoft for security. You can obtain the GPG public key of the Mandrake Linux Security Team by executing: gpg --recv-keys --keyserver www.mandrakesecure.net 0x22458A98 Please be aware that sometimes it takes the mirrors a few hours to update. You can view other update advisories for Mandrake Linux at: http://www.mandrakesecure.net/en/advisories/ MandrakeSoft has several security-related mailing list services that anyone can subscribe to. Information on these lists can be obtained by visiting: http://www.mandrakesecure.net/en/mlist.php If you want to report vulnerabilities, please contact security_linux-mandrake.com Type Bits/KeyID Date User ID pub 1024D/22458A98 2000-07-10 Linux Mandrake Security Team <security linux-mandrake.com> -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.0.7 (GNU/Linux) iD8DBQE/RV9ymqjQ0CJFipgRAuI9AJ9ALXjOCO0zsDVeWMY/L9kaQeP6PgCfVm9+ vHw6ApiFh0+4XY4+LhywMGY= =mVs6 -----END PGP SIGNATURE----- _______________________________________________ Full-Disclosure - We believe in it. Charter: http://lists.netsys.com/full-disclosure-charter.html
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- MDKSA-2003:085 - Updated gdm packages fix vulnerabilities Mandrake Linux Security Team (Aug 21)