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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 >> Debian Local Security Checks >> [DSA443] DSA-443-1 xfree86 Vulnerability Assessment Details
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[DSA443] DSA-443-1 xfree86 |
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DSA-443-1 xfree86 Detailed Explanation for this Vulnerability Assessment A number of vulnerabilities have been discovered in XFree86. The corrections are listed below with the identification from the Common Vulnerabilities and Exposures (CVE) project: Buffer overflow in ReadFontAlias from dirfile.c of XFree86 4.1.0 through 4.3.0 permits local users and remote attackers to execute arbitrary code via a font alias file (font.alias) with a long token, a different vulnerability than CVE-2004-0084. Buffer overflow in the ReadFontAlias function in XFree86 4.1.0 to 4.3.0, when using the CopyISOLatin1Lowered function, permits local or remote authenticated users to execute arbitrary code via a malformed entry in the font alias (font.alias) file, a different vulnerability than CVE-2004-0083. Miscellaneous additional flaws in XFree86's handling of font files. xdm does not verify whether the pam_setcred function call succeeds, which may permit attackers to gain root rights by triggering error conditions within PAM modules, as demonstrated in certain configurations of the MIT pam_krb5 module. Denial-of-service attacks against the X server by clients using the GLX extension and Direct Rendering Infrastructure are possible due to unchecked client data (out-of-bounds array indexes [CVE-2004-0093] and integer signedness errors [CVE-2004-0094]). Exploitation of CVE-2004-0083, CVE-2004-0084, CVE-2004-0106, CVE-2004-0093 and CVE-2004-0094 would require a connection to the X server. By default, display managers in Debian start the X server with a configuration which only accepts local connections, but if the configuration is changed to permit remote connections, or X servers are started by other means, then these bugs could be exploited remotely. Since the X server usually runs with root rights, these bugs could potentially be exploited to gain root rights. No attack vector for CVE-2003-0690 is known at this time. For the stable distribution (woody) these problems have been fixed in version 4.1.0-16woody3. For the unstable distribution (sid) these problems have been fixed in version 4.3.0-2. We recommend that you update your xfree86 package. Solution : http://www.debian.org/security/2004/dsa-443 Network Security Threat Level: High Networks Security ID: 9636, 9652, 9655, 9701 Vulnerability Assessment Copyright: This script is (C) 2005 Michel Arboi |
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