OpenSSL SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG Session Resume Ciphersuite Downgrade Issue

Medium Nessus Plugin ID 51892


The remote host allows resuming SSL sessions with a weaker cipher than the one originally negotiated.


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.


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: 2011/02/07

Modified: 2018/07/16

Dependencies: 51891

Risk Information

Risk Factor: Medium

CVSS v2.0

Base Score: 4.3

Temporal Score: 3.2

Vector: CVSS2#AV:N/AC:M/Au:N/C:N/I:P/A:N

Temporal Vector: CVSS2#E:U/RL:OF/RC:C

Vulnerability Information

CPE: cpe:/a:openssl:openssl

Required KB Items: SSL/Resume/Weaker

Exploit Available: false

Exploit Ease: No known exploits are available

Patch Publication Date: 2010/12/02

Vulnerability Publication Date: 2010/12/02

Reference Information

CVE: CVE-2010-4180

BID: 45164