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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 >> Gentoo Local Security Checks >> [GLSA-200402-02] XFree86 Font Information File Buffer Overflow Vulnerability Assessment Details
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[GLSA-200402-02] XFree86 Font Information File Buffer Overflow |
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XFree86 Font Information File Buffer Overflow Detailed Explanation for this Vulnerability Assessment The remote host is affected by the vulnerability described in GLSA-200402-02 (XFree86 Font Information File Buffer Overflow) Exploitation of a buffer overflow in The XFree86 Window System discovered by iDefence permits local attackers to gain root rights. The problem exists in the parsing of the 'font.alias' file. The X server (running as root) fails to check the length of the user provided input, so a malicious user may craft a malformed 'font.alias' file causing a buffer overflow upon parsing, eventually leading to the execution of arbitrary code. To reproduce the overflow on the command line one can run: # cat > fonts.dir < word.bdf -misc-fixed-medium-r-semicondensed--13-120-75-75-c-60-iso8859-1 EOF # perl -e 'print "0" x 1024 . "A" x 96 . "\n"' > fonts.alias # X :0 -fp $PWD {Some output removed}... Server aborting... Segmentation fault (core dumped) Impact Successful exploitation can lead to a root compromise provided that the attacker is able to execute commands in the X11 subsystem. This can be done either by having console access to the target or through a remote exploit against any X client program such as a web-browser, mail-reader or game. Workaround No immediate workaround is available a software upgrade is required. Gentoo has released XFree 4.2.1-r3, 4.3.0-r4 and 4.3.99.902-r1 and encourages all users to upgrade their XFree86 installations. Vulnerable versions are no longer available in Portage. References: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2004-0083 http://www.idefense.com/application/poi/display?id=72&type=vulnerabilities Solution: All users are recommended to upgrade their XFree86 installation: # emerge sync # emerge -pv x11-base/xfree # emerge x11-base/xfree Network Security Threat Level: High Networks Security ID: Vulnerability Assessment Copyright: (C) 2005 Michel Arboi |
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