OpenSSL 1.0.2i CRL Handling NULL Pointer Dereference DoS

This script is Copyright (C) 2016 Tenable Network Security, Inc.


Synopsis :

The remote service is affected by a denial of service vulnerability.

Description :

According to its banner, the remote host is running OpenSSL version
1.0.2i. It is, therefore, affected by a denial of service
vulnerability in x509_vfy.c due to improper handling of certificate
revocation lists (CRLs). An unauthenticated, remote attacker can
exploit this, via a specially crafted CRL, to cause a NULL pointer
dereference, resulting in a crash of the service.

See also :

https://www.openssl.org/news/secadv/20160926.txt

Solution :

Upgrade to OpenSSL version 1.0.2j or later.

Risk factor :

Medium / CVSS Base Score : 5.0
(CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P)
CVSS Temporal Score : 4.1
(CVSS2#E:F/RL:OF/RC:ND)
Public Exploit Available : true

Family: Web Servers

Nessus Plugin ID: 93786 ()

Bugtraq ID: 93171

CVE ID: CVE-2016-7052

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