libotr2 Base64 decoder buffer overflow

libotr-base64-bo (77528) The risk level is classified as HighHigh Risk

Description:

The Debian libotr2 package is vulnerable to a heap-based buffer overflow, caused by improper bounds checking by the Base64 decoder. By sending a specially-crafted OTR message, 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:

  • Debian Web site: libotr2.
  • Red Hat Bugzilla Bug 846377: CVE-2012-3461 libotr: Multiple heap-based buffer overflows in the Base64 decoder.
  • BID-54907: libotr2 Package Multiple Heap Based Buffer Overflow Vulnerabilities
  • CVE-2012-3461: The (1) otrl_base64_otr_decode function in src/b64.c; (2) otrl_proto_data_read_flags and (3) otrl_proto_accept_data functions in src/proto.c; and (4) decode function in toolkit/parse.c in libotr before 3.2.1 allocates a zero-length buffer when decoding a base64 string, which allows remote attackers to cause a denial of service (application crash) via a message with the value ?OTR:===., which triggers a heap-based buffer overflow.
  • DSA-2526: libotr -- heap-based buffer overflows

Platforms Affected:

  • Debian libotr2

Reported:

Aug 08, 2012

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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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