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VPR Score: 3.4
Synopsis
The remote Ubuntu host is missing one or more security-related patches.
Description
Yutaka Oiwa discovered a possible cryptographic weakness in OpenSSL applications. Applications using the OpenSSL library can use the SSL_OP_MSIE_SSLV2_RSA_PADDING option (or SSL_OP_ALL, which implies the former) to maintain compatibility with third-party products, which is achieved by working around known bugs in them.
The SSL_OP_MSIE_SSLV2_RSA_PADDING option disabled a verification step in the SSL 2.0 server supposed to prevent active protocol-version rollback attacks. With this verification step disabled, an attacker acting as a 'man in the middle' could force a client and a server to negotiate the SSL 2.0 protocol even if these parties both supported SSL 3.0 or TLS 1.0. The SSL 2.0 protocol is known to have severe cryptographic weaknesses and is supported as a fallback only.
Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.
Solution
Update the affected libssl-dev, libssl0.9.7 and / or openssl packages.