Home/CVE/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
CVE

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

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.

HIGH · CVSS 7.8 EPSS 0.3069
Act now
  • EPSS ≥ 0.10 - elevated exploitation probability
  • EPSS percentile: top 3% of all CVEs by exploitation likelihood
  • Public exploit or PoC is available
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-770Allocation of Resources Without Limits or Throttling
▤

Affected Products & Versions

8
digium asterisk< b.2.5.9
digium asterisk>= c.2.0 and <= c.2.4.1
digium asterisk>= c.3.0 and < c.3.1
digium s800i firmware>= 1.2.0 and < 1.3.0.3
digium asterisk>= 1.2.0 and < 1.2.34
digium asterisk>= 1.4.0 and < 1.4.26.1
digium asterisk>= 1.6.0 and < 1.6.0.12
digium asterisk>= 1.6.1 and < 1.6.1.4
⚠

Public Exploits & PoCs

1
pocwww.securityfocus.com · 36015www.securityfocus.com
▣

Scoring & Timeline

7.8
HIGH · CVSS v2 (legacy) · cve@mitre.org
View on NVD
This CVE predates CVSS v3; the legacy v2 score is shown so triage still has a severity to work with.
v2 Vector
AV:N/AC:L/Au:N/C:N/I:N/A:C
Published to NVD12 Aug 2009 · 10:30 AM
🔗

References & Sources

6
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
http://downloads.digium.com/pub/security/AST-2009-005.htmlProduct
http://labs.mudynamics.com/advisories/MU-200908-01.txtBroken Link
http://secunia.com/advisories/36227Broken LinkVendor Advisory
http://www.securityfocus.com/archive/1/505669/100/0/threadedBroken LinkThird Party AdvisoryVDB Entry
http://www.securitytracker.com/id?1022705Broken LinkThird Party AdvisoryVDB Entry
http://www.vupen.com/english/advisories/2009/2229Broken LinkVendor Advisory
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