Vulnerability Monitor

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CVE-2009-2726

The SIP channel driver in Asterisk Open Source 1.2.x before 1.2.34, 1.4.x before 1.4.26.1, 1.6.0.x before 1.6.0.12, and 1.6.1.x before 1.6.1.4; Asterisk Business Edition A.x.x, B.x.x before B.2.5.9, C.2.x before C.2.4.1, and C.3.x before C.3.1; and Asterisk Appliance s800i 1.2.x before 1.3.0.3 does not use a maximum width when invoking sscanf style functions, which allows remote attackers to cause a denial of service (stack memory consumption) via SIP packets containing large sequences of ASCII decimal characters, as demonstrated via vectors related to (1) the CSeq value in a SIP header, (2) large Content-Length value, and (3) SDP.

Published

2009-08-12T10:30:01.110

Last Modified

2025-04-09T00:30:58.490

Status

Deferred

Source

[email protected]

Severity

CVSSv2: 7.8 (HIGH)

CVSSv2 Vector

AV:N/AC:L/Au:N/C:N/I:N/A:C

  • Access Vector: NETWORK
  • Access Complexity: LOW
  • Authentication: NONE
  • Confidentiality Impact: NONE
  • Integrity Impact: NONE
  • Availability Impact: COMPLETE
Exploitability Score

10.0

Impact Score

6.9

Weaknesses
  • Type: Primary
    CWE-770
Affected Vendors & Products
Type Vendor Product Version/Range Vulnerable?
Application digium asterisk < b.2.5.9 Yes
Application digium asterisk ≤ c.2.4.1 Yes
Application digium asterisk < c.3.1 Yes
Operating System digium s800i_firmware < 1.3.0.3 Yes
Hardware digium s800i - No
Application digium asterisk < 1.2.34 Yes
Application digium asterisk < 1.4.26.1 Yes
Application digium asterisk < 1.6.0.12 Yes
Application digium asterisk < 1.6.1.4 Yes
References