CVE-2009-2726 Denial of service in n/a
Remote attackers can cause denial of service in Asterisk PBX by sending SIP packets with large sequences of ASCII decimal characters.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2009-2726?
CVE-2009-2726 is a high-severity denial of service vulnerability in Digium Asterisk, published on 12 Aug 2009. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-770
Which versions are affected by CVE-2009-2726?
It affects 2 products.
Products include Digium Asterisk, Digium S800i Firmware.
How do I fix CVE-2009-2726?
Upgrade to a fixed version.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2009-2726 being exploited?
There is no known exploitation of CVE-2009-2726 in the wild and no public exploit code.
Other vulnerabilities in Digium Asterisk
Sources
Also known as DEBIAN-CVE-2009-2726, GHSA-9w42-v5mm-2ffh.