CVE-2020-3165— Cisco NX-OS Software Border Gateway Protocol MD5 Authentication Bypass Vulnerability

Cisco NX-OS Software Border Gateway Protocol MD5 Authentication Bypass Vulnerability

A vulnerability in the implementation of Border Gateway Protocol (BGP) Message Digest 5 (MD5) authentication in Cisco NX-OS Software could allow an unauthenticated, remote attacker to bypass MD5 authentication and establish a BGP connection with the device. The vulnerability occurs because the BGP MD5 authentication is bypassed if the peer does not have MD5 authentication configured, the NX-OS device does have BGP MD5 authentication configured, and the NX-OS BGP virtual routing and forwarding (VRF) name is configured to be greater than 19 characters. An attacker could exploit this vulnerability by attempting to establish a BGP session with the NX-OS peer. A successful exploit could allow the attacker to establish a BGP session with the NX-OS device without MD5 authentication. The Cisco implementation of the BGP protocol accepts incoming BGP traffic only from explicitly configured peers. To exploit this vulnerability, an attacker must send the malicious packets over a TCP connection that appears to come from a trusted BGP peer. To do so, the attacker must obtain information about the BGP peers in the affected system’s trusted network.

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Cisco NX-OS Software 信任管理问题漏洞

Cisco NX-OS Software是美国思科（Cisco）公司的一套交换机使用的数据中心级操作系统软件。 Cisco Nexus 3000 Series Switches和Nexus 9000 Series Switches（处于standalone NX-OS模式下）中的NX-OS Software中存在信任管理问题漏洞。远程攻击者可利用该漏洞绕过BGP MD5身份验证，与其他NX-OS设备建立BGP会话。以下产品及版本受到影响：NX-OS Software 9.2(1)版本，9.2(2)版本，9

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