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: 1.9

Type: combined

Agent: windows, macosx, unix

Family: Web Servers

Published: 5/4/2016

Updated: 8/21/2023

Supported Sensors: Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.7

CVSS v2

Risk Factor: Critical

Base Score: 10

Temporal Score: 7.4

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

CVSS Score Source: CVE-2016-2108

CVSS v3

Risk Factor: Critical

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: installed_sw/OpenSSL

Exploit Ease: No known exploits are available

Patch Publication Date: 6/11/2015

Vulnerability Publication Date: 5/3/2016

Reference Information

CVE: CVE-2016-2108

BID: 89752