CVE-2011-4597

Description

The SIP over UDP implementation in Asterisk Open Source 1.4.x before 1.4.43, 1.6.x before 1.6.2.21, and 1.8.x before 1.8.7.2 uses different port numbers for responses to invalid requests depending on whether a SIP username exists, which allows remote attackers to enumerate usernames via a series of requests.

Category

5.0
CVSS
Severity: Medium
CVSS 2.0 •
EPSS 0.69% Top 30%
Vendor Advisory debian.org
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
http://osvdb.org/77597 vdb entry
http://downloads.asterisk.org/pub/security/AST-2011-013.html
http://openwall.com/lists/oss-security/2011/12/09/4 mailing list
http://openwall.com/lists/oss-security/2011/12/09/3 mailing list
http://secunia.com/advisories/47273 third party advisory
http://archives.neohapsis.com/archives/bugtraq/2011-12/0151.html mailing list
http://www.debian.org/security/2011/dsa-2367 vendor advisory
http://lists.digium.com/pipermail/asterisk-dev/2011-November/052191.html mailing list

Frequently Asked Questions

What is the severity of CVE-2011-4597?
CVE-2011-4597 has been scored as a medium severity vulnerability.
How to fix CVE-2011-4597?
To fix CVE-2011-4597, 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-2011-4597 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2011-4597 is being actively exploited. According to its EPSS score, there is a ~1% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
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