Vulnerability Information
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Vulnerability Title
N/A
Vulnerability 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.
CVSS Information
N/A
Vulnerability Type
N/A
Vulnerability Title
Asterisk IAX2报文放大远程拒绝服务漏洞
Vulnerability Description
Asterisk是开放源码的软件PBX，支持各种VoIP协议和设备。 Asterisk在处理呼叫的机制上存在漏洞，远程攻击者可能利用此漏洞对第三方机器执行拒绝服务攻击。 IAX2协议允许IC_NEW报文启动呼叫。IC_NEW报文是18字节长的UDP报文，而呼叫可能非常长，包含有很多数据。由于UDP是可以伪造的，远程攻击者可以在IAX2握手期间欺骗IAX2握手，导致Asterisk服务器向目标发送大量数据，造成网络堵塞。
CVSS Information
N/A
Vulnerability Type
N/A