Cisco Email Security Appliance Filter Bypass Vulnerability

A vulnerability in the Sender Policy Framework (SPF) functionality of Cisco AsyncOS Software for Cisco Email Security Appliance (ESA) could allow an unauthenticated, remote attacker to bypass the configured user filters on an affected device. The vulnerability exists because the affected software insufficiently validates certain incoming SPF messages. An attacker could exploit this vulnerability by sending a custom SPF packet to an affected device. A successful exploit could allow the attacker to bypass the configured header filters, which could allow malicious content to pass through the device.

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输入验证不恰当

Cisco Email Security Appliance 输入验证错误漏洞

Cisco Email Security Appliance（ESA）是美国思科（Cisco）公司的一个电子邮件安全设备。AsyncOS Software是运行在其中的一套操作系统。 Cisco ESA中的AsyncOS Software 13.5之前版本的Sender Policy Framework功能存在输入验证错误漏洞，该漏洞源于程序没有充分验证进入的SPF消息。远程攻击者可通过发送自定义的SPF数据包利用该漏洞绕过所配置的用户过滤器，发送恶意的内容。

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