OpenSSL 1.1.0a read_state_machine() Function Message Handling RCE

Critical Nessus Plugin ID 93787

Synopsis

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

Description

According to its banner, the remote host is running OpenSSL version 1.1.0a. It is, therefore, affected by a remote code execution vulnerability in the read_state_machine() function in statem.c due to improper handling of messages larger than 16k. An unauthenticated, remote attacker can exploit this, via a specially crafted message, to cause a use-after-free error, resulting in a denial of service condition or possibly the execution of arbitrary code.

Solution

Upgrade to OpenSSL version 1.1.0b or later.

See Also

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

Plugin Details

Severity: Critical

ID: 93787

File Name: openssl_1_1_0b.nasl

Version: 1.6

Type: remote

Family: Web Servers

Published: 2016/09/28

Updated: 2018/07/16

Dependencies: 57323

Risk Information

Risk Factor: Critical

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: 10

Temporal Score: 8.7

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/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: 2016/09/26

Vulnerability Publication Date: 2016/09/26

Reference Information

CVE: CVE-2016-6309

BID: 93177