OpenSSL < 1.0.2i Default Weak 64-bit Block Cipher (SWEET32)

medium Nessus Plugin ID 93112
New! Vulnerability Priority Rating (VPR)

Tenable calculates a dynamic VPR for every vulnerability. VPR combines vulnerability information with threat intelligence and machine learning algorithms to predict which vulnerabilities are most likely to be exploited in attacks. Read more about what VPR is and how it is different from CVSS.

VPR Score: 4.4

Synopsis

The service running on the remote host uses a weak encryption block cipher by default.

Description

According to its banner, the version of OpenSSL running on the remote host is prior to 1.0.2i. It is, therefore, affected by a vulnerability, known as SWEET32, in the 3DES and Blowfish algorithms due to the use of weak 64-bit block ciphers by default. A man-in-the-middle attacker who has sufficient resources can exploit this vulnerability, via a 'birthday' attack, to detect a collision that leaks the XOR between the fixed secret and a known plaintext, allowing the disclosure of the secret text, such as secure HTTPS cookies, and possibly resulting in the hijacking of an authenticated session.

Solution

Upgrade to OpenSSL version 1.0.2i or later.

See Also

https://www.openssl.org/blog/blog/2016/08/24/sweet32/

https://sweet32.info/

Plugin Details

Severity: Medium

ID: 93112

File Name: openssl_1_1_0.nasl

Version: 1.12

Type: remote

Family: Web Servers

Published: 8/25/2016

Updated: 11/14/2019

Dependencies: openssl_version.nasl

Risk Information

Risk Factor: Medium

VPR Score: 4.4

CVSS Score Source: CVE-2016-2183

CVSS v2.0

Base Score: 5

Temporal Score: 3.9

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

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

CVSS v3.0

Base Score: 7.5

Temporal Score: 6.7

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

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

Vulnerability Information

CPE: cpe:/a:openssl:openssl

Required KB Items: openssl/port

Exploit Available: true

Exploit Ease: No exploit is required

Patch Publication Date: 8/24/2016

Vulnerability Publication Date: 8/24/2016

Reference Information

CVE: CVE-2016-2183

BID: 92630