F5 Networks BIG-IP : libssh vulnerability (K57255643)

medium Nessus Plugin ID 93750

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Synopsis

The remote device is missing a vendor-supplied security patch.

Description

libssh before 0.7.3 improperly truncates ephemeral secrets generated for the (1) diffie-hellman-group1 and (2) diffie-hellman-group14 key exchange methods to 128 bits, which makes it easier for man-in-the-middle attackers to decrypt or intercept SSH sessions via unspecified vectors, aka a 'bits/bytes confusion bug.' (CVE-2016-0739)

Solution

Upgrade to one of the non-vulnerable versions listed in the F5 Solution K57255643.

See Also

https://support.f5.com/csp/article/K57255643

Plugin Details

Severity: Medium

ID: 93750

File Name: f5_bigip_SOL57255643.nasl

Version: 2.10

Type: local

Published: 9/28/2016

Updated: 1/4/2019

Risk Information

VPR

Risk Factor: Low

Score: 3.6

CVSS v2

Risk Factor: Medium

Base Score: 4.3

Temporal Score: 3.2

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

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

CVSS v3

Risk Factor: Medium

Base Score: 5.9

Temporal Score: 5.2

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

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

Vulnerability Information

CPE: cpe:/a:f5:big-ip_advanced_firewall_manager, cpe:/h:f5:big-ip

Required KB Items: Host/local_checks_enabled, Host/BIG-IP/hotfix, Host/BIG-IP/modules, Host/BIG-IP/version

Exploit Ease: No known exploits are available

Patch Publication Date: 9/27/2016

Reference Information

CVE: CVE-2016-0739