OpenSSL SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG Session Resume Ciphersuite Downgrade Issue
medium Nessus Plugin ID 51892
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VPR Score: 3.5
Synopsis
The remote host allows resuming SSL sessions with a weaker cipher than the one originally negotiated.Description
The version of OpenSSL on the remote host has been shown to allow resuming session with a weaker cipher than was used when the session was initiated. This means that an attacker that sees (i.e., by sniffing) the start of an SSL connection can manipulate the OpenSSL session cache to cause subsequent resumptions of that session to use a weaker cipher chosen by the attacker.Note that other SSL implementations may also be affected by this vulnerability.
Solution
Upgrade to OpenSSL 0.9.8q / 1.0.0.c or later, or contact your vendor for a patch.See Also
Plugin Details
Severity: Medium
ID: 51892
File Name: openssl_resume_different_cipher.nasl
Version: 1.23
Type: remote
Family: General
Published: 2/7/2011
Updated: 7/16/2018
Dependencies: ssl_resume.nasl
Risk Information
Risk Factor: Medium
VPR Score: 3.5
CVSS v2.0
Base Score: 4.3
Temporal Score: 3.2
Vector: AV:N/AC:M/Au:N/C:N/I:P/A:N
Temporal Vector: E:U/RL:OF/RC:C
Vulnerability Information
CPE: cpe:/a:openssl:openssl
Required KB Items: SSL/Resume/Weaker
Exploit Ease: No known exploits are available
Patch Publication Date: 12/2/2010
Vulnerability Publication Date: 12/2/2010
Reference Information
CVE: CVE-2010-4180
BID: 45164