Update to 1.4.21.2 to fix CVE-2008-3263 / AST-2008-010 and CVE-2008-3264 / AST-2008-011. AST-2008-010: Asterisk IAX 'POKE' resource exhaustion - http://downloads.digium.com/pub/security/AST-2008-010.html AST-2008-011: Traffic amplification in IAX2 firmware provisioning system - http://downloads.digium.com/pub/security/AST-2008-011.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のバージョンに実装されているファームウェアダウンロードプロトコルが、ハンドシェイクを開始しません。IAX2 FWDOWNLリクエストを偽装することで、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、影響を受けるホストからの不要なファームウェア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。

远程主机上运行的 Asterisk 版本中实施的固件下载协议未初始化握手。通过欺骗 IAX2 FWDOWNL 请求，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的不必要固件数据包来淹没第三方主机。

在遠端主機上執行的 Asterisk 版本中實作的韌體下載通訊協定不會初始化交握。透過偽造 IAX2 FWDOWNL 要求，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不需要的韌體封包造成第三方主機溢流。

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).

The firmware download protocol implemented in the version of Asterisk running on the remote host does not initiate a handshake.  By spoofing an IAX2 FWDOWNL request, an unauthenticated, remote attacker may be able to leverage this issue to flood a third-party host with unwanted firmware packets from the affected host.

ID	名稱	產品	系列	已發布	已更新	嚴重性
33569	Fedora 8 : asterisk-1.4.21.2-1.fc8 (2008-6676)	Nessus	Fedora Local Security Checks	2008/7/24	2021/1/11	high
33564	Asterisk IAX2のFWDOWNLリクエストスプーフィングのリモートDoS	Nessus	Denial of Service	2008/7/24	2018/11/15	medium
33564	Asterisk IAX2 FWDOWNL 请求欺骗远程 DoS	Nessus	Denial of Service	2008/7/24	2018/11/15	medium
33564	Asterisk IAX2 FWDOWNL 要求偽造遠端 DoS	Nessus	Denial of Service	2008/7/24	2018/11/15	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
33564	Asterisk IAX2 FWDOWNL Request Spoofing Remote DoS	Nessus	Denial of Service	2008/7/24	2018/11/15	medium

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