VDB-87749 · CVE-2016-4545 · Qualys 370534

F5 BIG-IP up to 10.2.0/11.5.3 SSL Handshake input validation

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7.2	$0-$5k	0.00

A vulnerability was found in F5 BIG-IP up to 10.2.0/11.5.3 (Firewall Software). It has been rated as critical. This issue affects an unknown code of the component SSL Handshake Handler. The manipulation with an unknown input leads to a input validation vulnerability. Using CWE to declare the problem leads to CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. Impacted is availability. The summary by CVE is:

Virtual servers in F5 BIG-IP 11.5.4, when SSL profiles are enabled, allow remote attackers to cause a denial of service (resource consumption and Traffic Management Microkernel restart) via an SSL alert during the handshake.

The weakness was shared 12/16/2015 as 518275 / SOL48042976 as confirmed knowledge base article (Website). The advisory is shared at support.f5.com. The identification of this vulnerability is CVE-2016-4545 since 05/05/2016. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Neither technical details nor an exploit are publicly available. The advisory points out:

When a Secure Sockets Layer (SSL) alert is sent during the handshake on a BIG-IP 11.5.4 base, the TMM may restart and produce a core file while logging SSL 'codec alert' messages to the /var/log/ltm file. The messages appear similar to the following example: warning tmm[32354]: 01260009:4: Connection error: hud_ssl_handler:1131: codec alert (20)

The vulnerability scanner Nessus provides a plugin with the ID 91435 (F5 Networks BIG-IP : BIG-IP SSL vulnerability (K48042976)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family F5 Networks Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 370534 (F5 BIG-IP ASM TMM SSL Denial of Service Vulnerability (K48042976)).

Upgrading to version 10.2.1, 11.0.0, 11.5.4 HF1, 11.6.0 or 12.0.0 eliminates this vulnerability. A possible mitigation has been published immediately after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (91435).

Productinfo

Type

Firewall Software

Vendor

Name

BIG-IP

Version

License

commercial

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB CVSS-B Score: 🔍
VulDB CVSS-BT Score: 🔍
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.5
VulDB Meta Temp Score: 7.3

VulDB Base Score: 7.5
VulDB Temp Score: 7.2
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
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NVD Base Score: 🔍

Exploitinginfo

Class: Input validation
CWE: CWE-20
ATT&CK: Unknown

Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 91435
Nessus Name: F5 Networks BIG-IP : BIG-IP SSL vulnerability (K48042976)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 867540
OpenVAS Name: F5 BIG-IP Denial of Service Vulnerability
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Upgrade: BIG-IP 10.2.1/11.0.0/11.5.4 HF1/11.6.0/12.0.0

Timelineinfo

12/16/2015 🔍
12/16/2015 +0 days 🔍
05/05/2016 +141 days 🔍
06/02/2016 +28 days 🔍
06/03/2016 +1 days 🔍
06/06/2016 +3 days 🔍
06/07/2016 +1 days 🔍
01/06/2019 +943 days 🔍

Sourcesinfo

Vendor: f5.com

Advisory: 518275 / SOL48042976
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2016-4545 (🔍)
SecurityTracker: 1036025

Entryinfo

Created: 06/06/2016 16:04
Updated: 01/06/2019 10:25
Changes: 06/06/2016 16:04 (64), 01/06/2019 10:25 (16)
Complete: 🔍