CVE-2011-4597
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…
Does this matter?
Lower severity and a low EPSS score (3.16%). Track it; it rarely justifies an emergency change on its own.
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.
- CVSS 2.0
- 5.0 MEDIUMAV:N/AC:L/Au:N/C:P/I:N/A:N
- EPSS
- 3.16% probability · 87th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-200
- Affected
- digium/asterisk
- Source
- secalert@redhat.com
References
- http://archives.neohapsis.com/archives/bugtraq/2011-12/0151.html
- http://downloads.asterisk.org/pub/security/AST-2011-013.html
- http://lists.digium.com/pipermail/asterisk-dev/2011-November/052191.html
- http://openwall.com/lists/oss-security/2011/12/09/3
- http://openwall.com/lists/oss-security/2011/12/09/4
- http://osvdb.org/77597
- http://secunia.com/advisories/47273
- http://www.debian.org/security/2011/dsa-2367
- http://archives.neohapsis.com/archives/bugtraq/2011-12/0151.html
- http://downloads.asterisk.org/pub/security/AST-2011-013.html
- http://lists.digium.com/pipermail/asterisk-dev/2011-November/052191.html
- http://openwall.com/lists/oss-security/2011/12/09/3
- http://openwall.com/lists/oss-security/2011/12/09/4
- http://osvdb.org/77597
- http://secunia.com/advisories/47273
- http://www.debian.org/security/2011/dsa-2367
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.