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CVE-2009-2346

Status Candidate

Overview

The IAX2 protocol implementation in Asterisk Open Source 1.2.x before 1.2.35, 1.4.x before 1.4.26.2, 1.6.0.x before 1.6.0.15, and 1.6.1.x before 1.6.1.6; Business Edition B.x.x before B.2.5.10, C.2.x before C.2.4.3, and C.3.x before C.3.1.1; and s800i 1.3.x before 1.3.0.3 allows remote attackers to cause a denial of service (call-number exhaustion) by initiating many IAX2 message exchanges, a related issue to CVE-2008-3263.

Related Files

Gentoo Linux Security Advisory 201006-20
Posted Jun 4, 2010
Authored by Gentoo | Site security.gentoo.org

Gentoo Linux Security Advisory 201006-20 - Multiple vulnerabilities in Asterisk might allow remote attackers to cause a Denial of Service condition, or conduct other attacks. Versions less than 1.2.37 are affected.

tags | advisory, remote, denial of service, vulnerability
systems | linux, gentoo
advisories | CVE-2008-7220, CVE-2009-2346, CVE-2009-2726, CVE-2009-3727, CVE-2009-4055
SHA-256 | c4933913b3f7de08c2c9cdd1eaa67457d52f479496c2830a647cc345b7604953
Asterisk Project Security Advisory - AST-2009-006
Posted Sep 4, 2009
Authored by Russell Bryant | Site asterisk.org

Asterisk Project Security Advisory - The IAX2 protocol uses a call number to associate messages with the call that they belong to. However, the protocol defines the call number field in messages as a fixed size 15 bit field. So, if all call numbers are in use, no additional sessions can be handled. A call number gets created at the start of an IAX2 message exchange. So, an attacker can send a large number of messages and consume the call number space. The attack is also possible using spoofed source IP addresses as no handshake is required before a call number is assigned.

tags | advisory, spoof, protocol
advisories | CVE-2009-2346
SHA-256 | b9b863efb0b85644076d3c974b98ce74f39e463464e8e6c41b443200a78dd088
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