OpenSSL 1.0.1 < 1.0.1o ASN.1 Encoder Negative Zero Value Handling RCE

Critical Nessus Plugin ID 90888

Synopsis

The remote service is affected by a remote code execution vulnerability.

Description

According to its banner, the remote host is running a version of OpenSSL 1.0.1 prior to 1.0.1o. It is, therefore, affected by a remote code execution vulnerability in the ASN.1 encoder due to an underflow condition that occurs when attempting to encode the value zero represented as a negative integer. An unauthenticated, remote attacker can exploit this to corrupt memory, resulting in the execution of arbitrary code.

Solution

Upgrade to OpenSSL version 1.0.1o or later.

See Also

https://www.openssl.org/news/secadv/20160503.txt

https://www.openssl.org/news/cl101.txt

Plugin Details

Severity: Critical

ID: 90888

File Name: openssl_1_0_1o.nasl

Version: 1.8

Type: remote

Family: Web Servers

Published: 2016/05/04

Updated: 2019/11/20

Dependencies: 57323

Risk Information

Risk Factor: Critical

CVSS Score Source: CVE-2016-2108

CVSS v2.0

Base Score: 10

Temporal Score: 7.4

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

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

CVSS v3.0

Base Score: 9.8

Temporal Score: 8.5

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

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/a:openssl:openssl

Required KB Items: openssl/port

Exploit Available: false

Exploit Ease: No known exploits are available

Patch Publication Date: 2015/06/11

Vulnerability Publication Date: 2016/05/03

Reference Information

CVE: CVE-2016-2108

BID: 89752