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Vulnerability Assessment & Network Security Forums |
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If through a vulnerability assessment, a network security issue is detected for the vulnerability below, applying the appropriate security patches in a timely matter is very important. If you have detected that your system has already been compromised, following CERT's Network Security recovery document will assist with recommended steps for system recovery. Home >> Browse Vulnerability Assessment Database >> Mandrake Local Security Checks >> MDKSA-2003:085: gdm Vulnerability Assessment Details
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MDKSA-2003:085: gdm |
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Check for the version of the gdm package Detailed Explanation for this Vulnerability Assessment The remote host is missing the patch for the advisory MDKSA-2003:085 (gdm). 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 permits 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. Solution : http://wwwnew.mandriva.com/security/advisories?name=MDKSA-2003:085 Network Security Threat Level: High Networks Security ID: 8469 Vulnerability Assessment Copyright: This script is Copyright (C) 2004 Tenable Network Security |
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