CVE ID:	CVE-2008-1897
Description:	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.
Test IDs:	1.3.6.1.4.1.25623.1.0.60921   1.3.6.1.4.1.25623.1.0.860633   1.3.6.1.4.1.25623.1.0.60917   1.3.6.1.4.1.25623.1.0.860686   1.3.6.1.4.1.25623.1.0.60929
Cross References:	Common Vulnerability Exposure (CVE) ID: CVE-2008-1897 BugTraq ID: 28901 http://www.securityfocus.com/bid/28901 Bugtraq: 20080422 AST-2008-006 - 3-way handshake in IAX2 incomplete (Google Search) http://www.securityfocus.com/archive/1/491220/100/0/threaded Debian Security Information: DSA-1563 (Google Search) http://www.debian.org/security/2008/dsa-1563 https://www.redhat.com/archives/fedora-package-announce/2008-April/msg00581.html https://www.redhat.com/archives/fedora-package-announce/2008-April/msg00600.html http://security.gentoo.org/glsa/glsa-200905-01.xml http://www.altsci.com/concepts/page.php?s=asteri&p=2 https://downloads.asterisk.org/pub/security/AST-2008-006.html https://github.com/jcollie/asterisk/commit/60de4fbbdf3ede49f158e23a9e3b679f2e519c1e https://github.com/jcollie/asterisk/commit/771b3d8749b34b6eea4e03a2e514380da9582f90 https://github.com/jcollie/asterisk/commit/a8b180875b037b8da26f6a3bcc8e5e98b8c904d2 https://github.com/kaoru6/asterisk/commit/1fe14f38dd43dc894d21f85762b51208ba5c8acb https://github.com/lyx2014/Asterisk/commit/0670e43c30135044e25cca7f80e1833e2c128653 https://github.com/mojolingo/asterisk/commit/20ac3662f137dbf7f42d5295590069a7d3b1166b https://github.com/pruiz/asterisk/commit/e0ef9bd22810c6969a7f222eec04798f19a7e2d6 https://github.com/silentindark/asterisk-1/commit/fe8b7f31db687f8b9992864b82c93d22833019c7 https://github.com/xrg/asterisk-xrg/commit/10da3dab24e8ca08cf2c983f8d0206e383535b5a https://github.com/xrg/asterisk-xrg/commit/51714a24347dc57f9a208a4a8af84115ef407b83 http://www.securitytracker.com/id?1019918 http://secunia.com/advisories/29927 http://secunia.com/advisories/30010 http://secunia.com/advisories/30042 http://secunia.com/advisories/34982 http://www.vupen.com/english/advisories/2008/1324 XForce ISS Database: asterisk-iax2protocol-ack-dos(41966) https://exchange.xforce.ibmcloud.com/vulnerabilities/41966