Information disclosure in Digium Asterisk
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 attackers to enumerate usernames via a series of requests.
Vulnerability class: Information Disclosure
Published · last modified .
CVSS v2 metric
CVSS v2 base score 5.0 (Medium). Vector: AV:N/AC:L/Au:N/C:P/I:N/A:N. This CVE predates CVSS v3 and has no v3 score from NVD.
EPSS exploit prediction
EPSS: 0.032 (87.5th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 87th percentile — 87.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.032 · newest: 0.032 · change: 0.000
Affected products
- Digium Asterisk — versions 1.8.0, 1.8.1, 1.8.1.1
Weakness classification (CWE)
References
- osvdb.org/77597 (vdb-entry)
- downloads.asterisk.org/pub/security/AST-2011-013.html
- openwall.com/lists/oss-security/2011/12/09/4 (mailing-list)
- openwall.com/lists/oss-security/2011/12/09/3 (mailing-list)
- secunia.com/advisories/47273 (third-party-advisory)
- archives.neohapsis.com/archives/bugtraq/2011-12/0151.html (mailing-list)
- www.debian.org/security/2011/dsa-2367 (vendor-advisory)
- lists.digium.com/pipermail/asterisk-dev/2011-November/052191.html (mailing-list)