OpenSSL 1.0.2i CRL Handling NULL Pointer Dereference DoS

high Nessus Plugin ID 93786
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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.

Solution

Upgrade to OpenSSL version 1.0.2j or later.

See Also

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

Plugin Details

Severity: High

ID: 93786

File Name: openssl_1_0_2j.nasl

Version: 1.7

Type: remote

Family: Web Servers

Published: 9/28/2016

Updated: 7/17/2018

Dependencies: openssl_version.nasl

Risk Information

VPR

Risk Factor: Low

Score: 3.6

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.7

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

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

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Temporal Vector: E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/a:openssl:openssl

Required KB Items: openssl/port

Exploit Ease: No known exploits are available

Patch Publication Date: 9/26/2016

Vulnerability Publication Date: 9/26/2016

Reference Information

CVE: CVE-2016-7052

BID: 93171