中文描述:

Cisco ASA 1000V Cloud Firewall等都是美国思科（Cisco）公司的产品。Cisco ASA 1000V Cloud Firewall是一套云防火墙解决方案。Cisco ASA 5500 Series Adaptive Security Appliances是下一代防火墙安全设备。Cisco ASA（Adaptive Security Appliances，自适应安全设备）Software是其中的一套防火墙和网络安全平台。该平台提供了对数据和网络资源的高度安全的访问等功能。 多款Cisco产品中的Cisco ASA Software的DNS代码存在拒绝服务漏洞，该漏洞源于程序在处理特制的DNS响应消息时出现错误。远程攻击者可通过触发DNS请求并使用特制的响应来回复利用该漏洞造成受影响系统重载，导致拒绝服务或破坏本地DNS缓存信息。以下产品受到影响：Cisco ASA 1000V Cloud Firewall；Cisco ASA 5500 Series Adaptive Security Appliances；Cisco ASA 5500-X Series Next-Generation Firewalls；Cisco ASA Services Module for Cisco Catalyst 6500 Series Switches和Cisco 7600 Series Routers；Cisco Adaptive Security Virtual Appliance (ASAv)；Cisco Firepower 9300 ASA Security Module；Cisco ISA 3000 Industrial Security Appliance。

英文描述:

A vulnerability in the DNS code of Cisco ASA Software could allow an unauthenticated, remote attacker to cause an affected device to reload or corrupt the information present in the device's local DNS cache. The vulnerability is due to a flaw in handling crafted DNS response messages. An attacker could exploit this vulnerability by triggering a DNS request from the Cisco ASA Software and replying with a crafted response. A successful exploit could cause the device to reload, resulting in a denial of service (DoS) condition or corruption of the local DNS cache information. Note: Only traffic directed to the affected device can be used to exploit this vulnerability. This vulnerability affects Cisco ASA Software configured in routed or transparent firewall mode and single or multiple context mode. This vulnerability can be triggered by IPv4 and IPv6 traffic. This vulnerability affects Cisco ASA Software running on the following products: Cisco ASA 1000V Cloud Firewall, Cisco ASA 5500 Series Adaptive Security Appliances, Cisco ASA 5500-X Series Next-Generation Firewalls, Cisco ASA Services Module for Cisco Catalyst 6500 Series Switches and Cisco 7600 Series Routers, Cisco Adaptive Security Virtual Appliance (ASAv), Cisco Firepower 9300 ASA Security Module, Cisco ISA 3000 Industrial Security Appliance. Fixed versions: 9.1(7.12) 9.2(4.18) 9.4(3.12) 9.5(3.2) 9.6(2.2). Cisco Bug IDs: CSCvb40898.

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