Asterisk ast_uri_encode() buffer overflow

asterisk-asturiencode-bo (64831) The risk level is classified as HighHigh Risk

Description:

Asterisk is vulnerable to a stack-based buffer overflow, caused by improper bounds checking by the ast_uri_encode() function. If the SIP channel driver is configured with the pedantic option enabled, a remote attacker could send a specially-crafted caller ID information to 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:

Refer to AST-2011-001 for patch, upgrade or suggested workaround information. See References.

References:

  • AST-2011-001: Stack buffer overflow in SIP channel driver.
  • BID-45839: Asterisk SIP Channel Driver Stack Buffer Overflow Vulnerability
  • CVE-2011-0495: Stack-based buffer overflow in the ast_uri_encode function in main/utils.c in Asterisk Open Source before 1.4.38.1, 1.4.39.1, 1.6.1.21, 1.6.2.15.1, 1.6.2.16.1, 1.8.1.2, 1.8.2.; and Business Edition before C.3.6.2; when running in pedantic mode allows remote authenticated users to execute arbitrary code via crafted caller ID data in vectors involving the (1) SIP channel driver, (2) URIENCODE dialplan function, or (3) AGI dialplan function.
  • DSA-2171: asterisk -- buffer overflow
  • OSVDB ID: 70518: Asterisk main/utils.c ast_uri_encode() Function Caller ID Information Overflow
  • SA42935: Asterisk ast_uri_encode() Buffer Overflow Vulnerability

Platforms Affected:

  • Digium Asterisk Open Source 1.4.38 rc1
  • Digium Asterisk Open Source 1.4.39 rc1
  • Digium Asterisk Open Source 1.6.1.20 rc2
  • Digium Asterisk Open Source 1.6.2.15 rc1
  • Digium Asterisk Open Source 1.6.2.16 rc1
  • Digium Asterisk Open Source 1.8.1.1
  • Digium Asterisk Open Source 1.8.1.2

Reported:

Jan 18, 2011

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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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