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CVE ID: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.
Test IDs: 1.3.6.1.4.1.25623.1.0.70595   1.3.6.1.4.1.25623.1.0.70579  
Cross References: Common Vulnerability Exposure (CVE) ID: CVE-2011-4597
Bugtraq: 20111222 Exploit for Asterisk Security Advisory AST-2011-013 (Google Search)
http://archives.neohapsis.com/archives/bugtraq/2011-12/0151.html
http://openwall.com/lists/oss-security/2011/12/09/3
http://openwall.com/lists/oss-security/2011/12/09/4
http://lists.digium.com/pipermail/asterisk-dev/2011-November/052191.html
Debian Security Information: DSA-2367 (Google Search)
http://www.debian.org/security/2011/dsa-2367
http://osvdb.org/77597
http://secunia.com/advisories/47273

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