Bug#541441: CVE-2009-2726: Asterisk SIP Channel Driver Denial of Service

[Giuseppe Iuculano]

Package: asterisk
Severity: serious
Tags: security

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Hi,
the following CVE (Common Vulnerabilities & Exposures) id was
published for asterisk.

CVE-2009-2726[0]:
| 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.

If you fix the vulnerability please also make sure to include the
CVE id in your changelog entry.

For further information see:

[0] http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-2726
    http://security-tracker.debian.net/tracker/CVE-2009-2726

Cheers,
Giuseppe

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