OpenSSL <= 0.9.8f DoS

Medium Nessus Network Monitor Plugin ID 8663

Synopsis

The remote web server is running an outdated instance of OpenSSL which is prone to a denial of service vulnerability.

Description

According to its banner, the remote host is running a version of OpenSSL older than 0.9.8g. Such versions are prone to a denial of service vulnerability due to an error in the 'hostname' TLS extension. Specifically, the issue affects the 'ssl/ssl_lib.c' source file. An attacker can exploit this issue to cause a memory access violation, potentially crashing the service and denying access to legitimate users.

Solution

Upgrade to OpenSSL 0.9.8g or later.

See Also

http://www.nessus.org/u?48371763

http://www.nessus.org/u?d2ed1787

https://www.openssl.org/news/vulnerabilities.html

Plugin Details

Severity: Medium

ID: 8663

Family: Web Servers

Published: 2015/03/27

Modified: 2016/01/21

Dependencies: 5563

Risk Information

Risk Factor: Medium

CVSSv2

Base Score: 5

Temporal Score: 4.1

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

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

CVSSv3

Base Score: 5.3

Temporal Score: 4.9

Vector: CVSS3#AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Temporal Vector: CVSS3#E:F/RL:O/RC:C

Vulnerability Information

CPE: cpe:/a:openssl:openssl

Patch Publication Date: 2009/02/23

Vulnerability Publication Date: 2015/03/19

Reference Information

CVE: CVE-2009-5146

BID: 73121