F5 Networks BIG-IP : NTP vulnerability (K17517)

Medium Nessus Plugin ID 91313


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


Memory leak in the CRYPTO_ASSOC function in ntpd in NTP 4.2.x before 4.2.8p4, and 4.3.x before 4.3.77 allows remote attackers to cause a denial of service (memory consumption). (CVE-2015-7701)


An attacker could send packets to ntpd that may, after several days of ongoing attack, cause it to run out of memory. There is no control plane exposure in the BIG-IP system when you use a default configuration, and this issue is exposed only when NTP is configured to use the Autokey security protocol.


Upgrade to one of the non-vulnerable versions listed in the F5 Solution K17517.

See Also



Plugin Details

Severity: Medium

ID: 91313

File Name: f5_bigip_SOL17517.nasl

Version: 2.9

Type: local

Published: 2016/05/25

Updated: 2020/06/22

Dependencies: 76940

Configuration: Enable paranoid mode

Risk Information

Risk Factor: Medium

CVSS v2.0

Base Score: 5

Temporal Score: 3.7

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P

Temporal Vector: CVSS2#E:U/RL:OF/RC:C

CVSS v3.0

Base Score: 7.5

Temporal Score: 6.5

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

Temporal Vector: CVSS:3.0/E:U/RL:O/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 Available: false

Exploit Ease: No known exploits are available

Patch Publication Date: 2015/11/02

Vulnerability Publication Date: 2017/08/07

Reference Information

CVE: CVE-2015-7701