F5 TLS Session Ticket Implementation Remote Memory Disclosure (Ticketbleed) (uncredentialed check)

high Nessus Plugin ID 97191
New! Plugin Severity Now Using CVSS v3

The calculated severity for Plugins has been updated to use CVSS v3 by default. Plugins that do not have a CVSS v3 score will fall back to CVSS v2 for calculating severity. Severity display preferences can be toggled in the settings dropdown.

Synopsis

The remote device is affected by an information disclosure vulnerability.

Description

Based on its response to a resumed TLS connection, the remote service appears to be affected by an information disclosure vulnerability, known as Ticketbeed, in the TLS Session Ticket implementation. The issue is due to the server incorrectly echoing back 32 bytes of memory, even if the Session ID was shorter. A remote attacker can exploit this vulnerability, by providing a 1-byte Session ID, to disclose up to 31 bytes of uninitialized memory which may contain sensitive information such as private keys, passwords, and other sensitive data.

Note that this vulnerability is only exploitable if the non-default Session Tickets option enabled.

Solution

Upgrade to a fixed version according to the vendor advisory (K05121675). Alternatively, disable the Session Ticket option on the affected Client SSL profile.

See Also

https://filippo.io/Ticketbleed/

https://blog.filippo.io/finding-ticketbleed/

https://support.f5.com/csp/article/K05121675

Plugin Details

Severity: High

ID: 97191

File Name: f5_session_id_mem_disclosure.nasl

Version: 1.18

Type: remote

Family: General

Published: 2/15/2017

Updated: 2/3/2021

Dependencies: ssl_supported_versions.nasl, bigip_web_detect.nasl

Risk Information

CVSS Score Source: CVE-2016-9244

VPR

Risk Factor: Medium

Score: 4.4

CVSS v2

Risk Factor: Medium

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

Risk Factor: High

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: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_analytics, cpe:/h:f5:big-ip, cpe:/h:f5:big-ip_protocol_security_manager

Required KB Items: installed_sw/F5 BIG-IP web management

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 2/9/2017

Vulnerability Publication Date: 2/9/2017

Reference Information

CVE: CVE-2016-9244

EDB-ID: 41298