GNU FriBidi log2vis_utf8 buffer overflow

fribidi-log2visutf8-bo (64619) The risk level is classified as HighHigh Risk

Description:

GNU FriBidi is vulnerable to a heap-based buffer overflow, caused by improper bounds checking by the log2vis_utf8 function. By sending a specially-crafted Arabic UTF-8 string, a remote attacker could overflow a buffer and execute arbitrary code on the system or cause the application to crash.

*CVSS:

Base Score: 7.5
  Access Vector: Network
  Access Complexity: Low
  Authentication: None
  Confidentiality Impact: Partial
  Integrity Impact: Partial
  Availability Impact: Partial
 
Temporal Score: 5.5
  Exploitability: Unproven
  Remediation Level: Official-Fix
  Report Confidence: Confirmed

Consequences:

Gain Access

Remedy:

Apply the appropriate update for your system. See References.

References:

  • FriBidi Web site: FriBidi.
  • Red Hat Bugzilla Bug 565997: CVE-2010-3444 pyfribidi: buffer overflow when processing Arabic UTF-8 strings.
  • BID-43592: FriBidi Python binding (pyfribidi) Heap Buffer Overflow Vulnerability
  • CVE-2010-3444: Buffer overflow in the log2vis_utf8 function in pyfribidi.c in GNU FriBidi 0.19.1, 0.19.2, and possibly other versions, as used in PyFriBidi 0.10.1, allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via a crafted Arabic UTF-8 string that causes original 2-byte UTF-8 sequences to be transformed into 3-byte sequences.
  • OSVDB ID: 70365: PyFriBidi GNU FriBidi pyfribidi.c log2vis_utf8 Function Arabic UTF-8 String Handling Overflow
  • SA42868: Fedora update for pyfribidi

Platforms Affected:

  • Behdad Esfahbod GNU FriBidi 0.19.1
  • Behdad Esfahbod GNU FriBidi 0.19.2
  • Kobi Zamir Pyfribidi 0.10.1

Reported:

Oct 01, 2010

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The information within this database may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. In no event shall IBM be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.

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