National Cyber Awareness System

Vulnerability Summary for CVE-2008-1897

Overview

The IAX2 channel driver (chan_iax2) in Asterisk Open Source 1.0.x, 1.2.x before 1.2.28, and 1.4.x before 1.4.19.1; Business Edition A.x.x, B.x.x before B.2.5.2, and C.x.x before C.1.8.1; AsteriskNOW before 1.0.3; Appliance Developer Kit 0.x.x; and s800i before 1.1.0.3, when configured to allow unauthenticated calls, does not verify that an ACK response contains a call number matching the server's reply to a NEW message, which allows remote attackers to cause a denial of service (traffic amplification) via a spoofed ACK response that does not complete a 3-way handshake. NOTE: this issue exists because of an incomplete fix for CVE-2008-1923.

Impact

CVSS Severity (version 2.0):

CVSS Version 2 Metrics:

References to Advisories, Solutions, and Tools

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External Source: FEDORA

Name: FEDORA-2008-3390

Hyperlink:https://www.redhat.com/archives/fedora-package-announce/2008-April/msg00600.html

External Source: FEDORA

Name: FEDORA-2008-3365

Hyperlink:https://www.redhat.com/archives/fedora-package-announce/2008-April/msg00581.html

External Source: XF

Name: asterisk-iax2protocol-ack-dos(41966)

Hyperlink:http://xforce.iss.net/xforce/xfdb/41966

External Source: VUPEN

Name: ADV-2008-1324

Hyperlink:http://www.vupen.com/english/advisories/2008/1324

External Source: SECTRACK

Name: 1019918

Hyperlink:http://www.securitytracker.com/id?1019918

External Source: BID

Name: 28901

Hyperlink:http://www.securityfocus.com/bid/28901

External Source: BUGTRAQ

Name: 20080422 AST-2008-006 - 3-way handshake in IAX2 incomplete

Hyperlink:http://www.securityfocus.com/archive/1/archive/1/491220/100/0/threaded

External Source: DEBIAN

Name: DSA-1563

Hyperlink:http://www.debian.org/security/2008/dsa-1563

External Source: MISC

Name: http://www.altsci.com/concepts/page.php?s=asteri&p=2

Hyperlink:http://www.altsci.com/concepts/page.php?s=asteri&p=2

External Source: GENTOO

Name: GLSA-200905-01

Hyperlink:http://security.gentoo.org/glsa/glsa-200905-01.xml

External Source: SECUNIA

Name: 34982

Hyperlink:http://secunia.com/advisories/34982

External Source: SECUNIA

Name: 30042

Type: Advisory

Hyperlink:http://secunia.com/advisories/30042

External Source: SECUNIA

Name: 30010

Type: Advisory

Hyperlink:http://secunia.com/advisories/30010

External Source: SECUNIA

Name: 29927

Type: Advisory

Hyperlink:http://secunia.com/advisories/29927

External Source: CONFIRM

Name: http://downloads.digium.com/pub/security/AST-2008-006.html

Hyperlink:http://downloads.digium.com/pub/security/AST-2008-006.html

External Source: CONFIRM

Name: http://bugs.digium.com/view.php?id=10078

Hyperlink:http://bugs.digium.com/view.php?id=10078