CVE-2011-2536

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.

Category

5.0
CVSS
Severity: Medium
CVSS 2.0 •
EPSS 0.19%
Vendor Advisory asterisk.org
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
http://downloads.asterisk.org/pub/security/AST-2011-011-1.8.diff patch
http://downloads.asterisk.org/pub/security/AST-2011-011.html vendor advisory
http://www.securitytracker.com/id?1025734 vdb entry

Frequently Asked Questions

What is the severity of CVE-2011-2536?
CVE-2011-2536 has been scored as a medium severity vulnerability.
How to fix CVE-2011-2536?
To fix CVE-2011-2536, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2011-2536 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2011-2536 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
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