F5 Networks BIG-IP : OpenSSH vulnerability (K17113)

high Nessus Plugin ID 88812
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Synopsis

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

Description

The kbdint_next_device function in auth2-chall.c in sshd in OpenSSH through 6.9 does not properly restrict the processing of keyboard-interactive devices within a single connection, which makes it easier for remote attackers to conduct brute-force attacks or cause a denial of service (CPU consumption) via a long and duplicative list in the ssh -oKbdInteractiveDevices option, as demonstrated by a modified client that provides a different password for each pam element on this list. (CVE-2015-5600)

Solution

Upgrade to one of the non-vulnerable versions listed in the F5 Solution K17113.

See Also

https://support.f5.com/csp/article/K17113

Plugin Details

Severity: High

ID: 88812

File Name: f5_bigip_SOL17113.nasl

Version: 2.8

Type: local

Published: 2/18/2016

Updated: 1/4/2019

Dependencies: f5_bigip_detect.nbin

Configuration: Enable paranoid mode

Risk Information

VPR

Risk Factor: Medium

Score: 4.2

CVSS v2

Risk Factor: High

Base Score: 8.5

Temporal Score: 6.3

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

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

Vulnerability Information

CPE: cpe:/a:f5:big-ip_access_policy_manager, cpe:/a:f5:big-ip_advanced_firewall_manager, cpe:/a:f5:big-ip_application_acceleration_manager, cpe:/a:f5:big-ip_application_security_manager, cpe:/a:f5:big-ip_application_visibility_and_reporting, cpe:/a:f5:big-ip_global_traffic_manager, cpe:/a:f5:big-ip_link_controller, cpe:/a:f5:big-ip_local_traffic_manager, cpe:/a:f5:big-ip_policy_enforcement_manager, cpe:/a:f5:big-ip_wan_optimization_manager, cpe:/a:f5:big-ip_webaccelerator, cpe:/h:f5:big-ip, cpe:/h:f5:big-ip_protocol_security_manager

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

Exploit Ease: No known exploits are available

Patch Publication Date: 8/14/2015

Reference Information

CVE: CVE-2015-5600