Cross-protocol attack on TLS using... CVE-2016-0800 CNNVD-201603-001

4.3 AV AC AU C I A
发布: 2016-03-01
修订: 2018-11-30

现在流行的服务器和客户端使用TLS加密, 然而由于错误配置, 许多服务器仍然支持SSLv2, 这是一种古老的协议, 许多客户端已经不支持 SSLv2。 DROWN攻击可以威胁到还在支持 SSLv2 的服务端和客户端,允许攻击者通过发送 probe 到支持 SSLv2 的使用相同密钥的服务端和客户端解密 TLS 通信。 ### 官方关于漏洞的公告: A cross-protocol attack was discovered that could lead to decryption of TLS sessions by using a server supporting SSLv2 and EXPORT cipher suites as a Bleichenbacher RSA padding oracle. Note that traffic between clients and non-vulnerable servers can be decrypted provided another server supporting SSLv2 and EXPORT ciphers (even with a different protocol such as SMTP, IMAP or POP) shares the RSA keys of the non-vulnerable server. This vulnerability is known as DROWN (CVE-2016-0800). Recovering one session key requires the attacker to perform approximately 2^50 computation, as well as thousands of connections to the affected server. A more efficient variant of the DROWN attack exists against unpatched OpenSSL servers using versions that predate 1.0.2a, 1.0.1m, 1.0.0r and 0.9.8zf released on 19/Mar/2015 (see...

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