OpenSSL 1.0.2 < 1.0.2f Multiple Vulnerabilities (Logjam)

low Nessus Plugin ID 88530
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Synopsis

The remote service is affected by multiple vulnerabilities.

Description

According to its banner, the remote host is running a version of OpenSSL 1.0.2 prior to 1.0.2f. It is, therefore, affected by the following vulnerabilities :

- A cipher algorithm downgrade vulnerability exists due to a flaw that is triggered when handling cipher negotiation. A remote attacker can exploit this to negotiate SSLv2 ciphers and complete SSLv2 handshakes even if all SSLv2 ciphers have been disabled on the server. Note that this vulnerability only exists if the SSL_OP_NO_SSLv2 option has not been disabled.
(CVE-2015-3197)

- A man-in-the-middle vulnerability, known as Logjam, exists due to a flaw in the SSL/TLS protocol. A remote attacker can exploit this flaw to downgrade connections using ephemeral Diffie-Hellman key exchange to 512-bit export-grade cryptography. (CVE-2015-4000)

- An information disclosure vulnerability exists due to a flaw in the DH_check_pub_key() function that is triggered when generating DH parameters based on unsafe primes. A remote attacker can exploit this, via multiple handshakes, to disclose the private DH exponent.
(CVE-2016-0701)

Solution

Upgrade to OpenSSL version 1.0.2f or later.

See Also

https://www.openssl.org/news/secadv/20160128.txt

https://weakdh.org/

Plugin Details

Severity: Low

ID: 88530

File Name: openssl_1_0_2f.nasl

Version: 1.10

Type: remote

Family: Web Servers

Published: 2/2/2016

Updated: 11/20/2019

Dependencies: openssl_version.nasl

Risk Information

CVSS Score Source: CVE-2015-4000

VPR

Risk Factor: Low

Score: 3.9

CVSS v2

Risk Factor: Medium

Base Score: 4.3

Temporal Score: 3.2

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

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

CVSS v3

Risk Factor: Low

Base Score: 3.7

Temporal Score: 3.2

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

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: 1/28/2016

Vulnerability Publication Date: 1/28/2016

Reference Information

CVE: CVE-2015-3197, CVE-2015-4000, CVE-2016-0701

BID: 74733

CERT: 257823