CVE-2011-2536
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…
Does this matter?
Lower severity and a low EPSS score (1.94%). Track it; it rarely justifies an emergency change on its own.
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.
- CVSS 2.0
- 5.0 MEDIUMAV:N/AC:L/Au:N/C:P/I:N/A:N
- EPSS
- 1.94% probability · 79th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-200
- Affected
- digium/asterisk
- Source
- cve@mitre.org
References
- http://downloads.asterisk.org/pub/security/AST-2011-011-1.8.diffPatch
- http://downloads.asterisk.org/pub/security/AST-2011-011.htmlVendor Advisory
- http://www.securitytracker.com/id?1025734
- http://downloads.asterisk.org/pub/security/AST-2011-011-1.8.diffPatch
- http://downloads.asterisk.org/pub/security/AST-2011-011.htmlVendor Advisory
- http://www.securitytracker.com/id?1025734
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.