X.Org libXfont BDF buffer overflow

libxfont-cve20136462-bo (90123) The risk level is classified as MediumMedium Risk

Description:

X.Org libXfont is vulnerable to a stack-based buffer overflow, caused by improper bounds checking when parsing malicious files. By persuading a victim to open a specially-crafted BDF file, a remote attacker could overflow a buffer and execute arbitrary code on the system or cause the application to crash.

*CVSS:

Base Score: 6.8
  Access Vector: Network
  Access Complexity: Medium
  Authentication: None
  Confidentiality Impact: Partial
  Integrity Impact: Partial
  Availability Impact: Partial
 
Temporal Score: 5
  Exploitability: Unproven
  Remediation Level: Official-Fix
  Report Confidence: Confirmed

Consequences:

Gain Access

Remedy:

Refer to X.Org security advisory, January 7, 2014 for patch, upgrade or suggested workaround information. See References.

References:

  • Oracle Sun Blog, Feb 25, 2014: CVE-2013-6462 Buffer Errors vulnerability in X.Org .
  • Oracle Web site: Oracle Critical Patch Update Advisory - April 2014.
  • oss-security: Tue, 7 Jan 2014: Fwd: X.Org Security Advisory: CVE-2013-6462: Stack buffer overflow in parsing of BDF font files in libXfont.
  • X.Org security advisory, January 7, 2014: CVE-2013-6462: Stack buffer overflow in parsing of BDF font files in libXfont.
  • BID-64694: X.Org libXfont BDF Font File Handling Stack Buffer Overflow Vulnerability
  • CVE-2013-6462: Stack-based buffer overflow in the bdfReadCharacters function in bitmap/bdfread.c in X.Org libXfont 1.1 through 1.4.6 allows remote attackers to cause a denial of service (crash) or possibly execute arbitrary code via a long string in a character name in a BDF font file.
  • RHSA-2014-0018: Important: libXfont security update
  • SA56240: X.Org libXfont "bdfReadCharacters()" Buffer Overflow Vulnerability
  • SA57152: Oracle Solaris X.Org libXfont "bdfReadCharacters()" Buffer Overflow Vulnerability

Platforms Affected:

  • RedHat Enterprise Linux 5 Client
  • RedHat Enterprise Linux 5
  • RedHat Enterprise Linux 5 Client Workstation
  • RedHat Enterprise Linux 6 Workstation
  • RedHat Enterprise Linux 6 Server
  • RedHat Enterprise Linux Desktop 6
  • RedHat Enterprise Linux HPC Node 6
  • Sun Solaris 10
  • X.Org libXfont 1.2.1
  • X.Org libXfont 1.2.2
  • X.Org libXfont 1.3.1
  • X.Org libXfont 1.4.3

Reported:

Jan 07, 2014

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