CVE-2011-2536 Information disclosure in n/a
Remote attackers can enumerate valid SIP account names by observing response differences, bypassing the alwaysauthreject security feature.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2011-2536?
CVE-2011-2536 is a medium-severity vulnerability in Digium Asterisk, published on 6 Jul 2011. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
chan_sip.c in the SIP channel driver in Asterisk Open Source 1.4.x before 1.4.41.2, 1.6.2.x before 1.6.2.18.2, and 1.8.x before 1.8.4.4, and Asterisk Business Edition C.3.x before C.3.7.3, disregards the alwaysauthreject option and generates different responses for invalid SIP requests depending on whether the user account exists, which allows remote attackers to enumerate account names via a series of requests.
Weakness: CWE-200
Which versions are affected by CVE-2011-2536?
It affects 1 product.
Products include Digium Asterisk.
How do I fix CVE-2011-2536?
Upgrade to a fixed version.
Is CVE-2011-2536 being exploited?
There is no known exploitation of CVE-2011-2536 in the wild and no public exploit code.
Other vulnerabilities in Digium Asterisk
Sources
Also known as DEBIAN-CVE-2011-2536, GHSA-939c-fxc3-rc2x.