The version of Asterisk running on the remote host does not properly validate an IAX2 handshake.  By spoofing NEW and ACK messages, an unauthenticated, remote attacker may be able to leverage this issue to flood a third-party host with packets from the affected host containing audio data.

Fixes security bug found in IAX2:
http://downloads.digium.com/pub/security/AST-2008-006.html

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

リモートホストで実行されているAsteriskのバージョンは、IAX2ハンドシェイクを適切に検証しません。NEWおよびACKメッセージを偽装することで、認証されていないリモートの攻撃者がこの問題を利用し、オーディオデータを含む影響を受けるホストからのパケットをサードパーティのホストに大量に送信する可能性があります。

遠端主機上執行的 Asterisk 版本未正確驗證 IAX2 交握。透過偽造 NEW 和 ACK 訊息，未經驗證的遠端攻擊者可能利用此問題，使用來自受影響主機內含音訊資料的封包造成第三方主機溢流。

远程主机上运行的 Asterisk 版本未正确验证 IAX2 握手。通过欺骗 NEW 和 ACK 消息，未经身份验证的远程攻击者可能会利用此问题，借助来自受影响主机且包含音频数据的数据包来淹没第三方主机。

Joel R. Voss discovered that the IAX2 module of Asterisk, a free software PBX and telephony toolkit performs insufficient validation of IAX2 protocol messages, which may lead to denial of service.

The remote host is affected by the vulnerability described in GLSA-200905-01 (Asterisk: Multiple vulnerabilities)

    Multiple vulnerabilities have been discovered in the IAX2 channel     driver when performing the 3-way handshake (CVE-2008-1897), when     handling a large number of POKE requests (CVE-2008-3263), when handling     authentication attempts (CVE-2008-5558) and when handling firmware     download (FWDOWNL) requests (CVE-2008-3264). Asterisk does also not     correctly handle SIP INVITE messages that lack a 'From' header     (CVE-2008-2119), and responds differently to a failed login attempt     depending on whether the user account exists (CVE-2008-3903,     CVE-2009-0041).
  Impact :

    Remote unauthenticated attackers could send specially crafted data to     Asterisk, possibly resulting in a Denial of Service via a daemon crash,     call-number exhaustion, CPU or traffic consumption. Remote     unauthenticated attackers could furthermore enumerate valid usernames     to facilitate brute-force login attempts.
  Workaround :

    There is no known workaround at this time.

This security update fixes multiple security vulnerabilities in asterisk (CVE-2008-1897, CVE-2008-2119, CVE-2008-3263, CVE-2008-3264).

ID	名稱	產品	系列	已發布	已更新	嚴重性
32132	Asterisk IAX2 Multiple Method Handshake Spoofing DoS	Nessus	Denial of Service	2008/5/6	2018/11/15	medium
32098	Fedora 7 : asterisk-1.4.19.1-1.fc7 (2008-3365)	Nessus	Fedora Local Security Checks	2008/5/1	2021/1/11	medium
32102	Fedora 8 : asterisk-1.4.19.1-1.fc8 (2008-3390)	Nessus	Fedora Local Security Checks	2008/5/1	2021/1/11	medium
32132	Asterisk IAX2の複数メソッドハンドシェイクスプーフィングのDoS	Nessus	Denial of Service	2008/5/6	2018/11/15	medium
32132	Asterisk IAX2 多個方法交握偽造 DoS	Nessus	Denial of Service	2008/5/6	2018/11/15	medium
32132	Asterisk IAX2 多种方法握手欺骗 DoS	Nessus	Denial of Service	2008/5/6	2018/11/15	medium
32125	Debian DSA-1563-1 : asterisk - programming error	Nessus	Debian Local Security Checks	2008/5/2	2021/1/4	medium
38677	GLSA-200905-01 : Asterisk: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	2009/5/4	2021/1/6	high
33894	openSUSE 10 Security Update : asterisk (asterisk-5524)	Nessus	SuSE Local Security Checks	2008/8/15	2021/1/14	high

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