Information disclosure in Digium Asterisk

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 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.

Vulnerability class: Information Disclosure

EPSS: 0.019 (78.1th percentile) — read the EPSS interpretation.

Affected products

Digium Asterisk — versions 1.8.0, 1.8.1, 1.8.1.1
N/a — versions n/a

Weakness classification (CWE)

CWE-200 — Information Disclosure

References

cve@mitre.org (x_refsource_CONFIRM, Patch)
cve@mitre.org (x_refsource_CONFIRM, Vendor Advisory)
cve@mitre.org (vdb-entry, x_refsource_SECTRACK)