F5 BIG-IP up to 14.1.0.1 Appliance Mode access control

Summaryinfo

A vulnerability marked as critical has been reported in F5 BIG-IP up to 11.5.8/11.6.3.4/12.1.4/13.1.1.4/14.1.0.1. The impacted element is an unknown function of the component Appliance Mode. This manipulation causes access control. This vulnerability appears as CVE-2019-6616. The attack may be initiated remotely. There is no available exploit.

Detailsinfo

A vulnerability has been found in F5 BIG-IP up to 11.5.8/11.6.3.4/12.1.4/13.1.1.4/14.1.0.1 (Firewall Software) and classified as critical. Affected by this vulnerability is an unknown code of the component Appliance Mode. The manipulation with an unknown input leads to a access control vulnerability. The CWE definition for the vulnerability is CWE-284. The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

On BIG-IP 14.0.0-14.1.0.1, 13.0.0-13.1.1.4, 12.1.0-12.1.4, 11.6.1-11.6.3.4, and 11.5.2-11.5.8, administrative users with TMSH access can overwrite critical system files on BIG-IP which can result in bypass of whitelist / blacklist restrictions enforced by appliance mode.

The bug was discovered 05/01/2019. The weakness was presented 05/03/2019 (Website). It is possible to read the advisory at support.f5.com. This vulnerability is known as CVE-2019-6616 since 01/22/2019. The attack can be launched remotely. A single authentication is needed for exploitation. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 09/12/2023). The attack technique deployed by this issue is T1068 according to MITRE ATT&CK.

The vulnerability was handled as a non-public zero-day exploit for at least 2 days. During that time the estimated underground price was around $5k-$25k. The commercial vulnerability scanner Qualys is able to test this issue with plugin 371793 (F5 BIG-IP ASM,LTM,APM Appliance Mode tmsh Privilege Escalation Vulnerability(K82814400)).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

See VDB-134386, VDB-134384, VDB-134382 and VDB-134381 for similar entries. Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Type

• Firewall Software

Vendor

• F5

Name

• BIG-IP

Version

• 11.5.0
• 11.5.1
• 11.5.2
• 11.5.3
• 11.5.4
• 11.5.5
• 11.5.6
• 11.5.7
• 11.5.8
• 11.6.3.0
• 11.6.3.1
• 11.6.3.2
• 11.6.3.3
• 11.6.3.4
• 12.1.0
• 12.1.1
• 12.1.2
• 12.1.3
• 12.1.4
• 13.1.1.0
• 13.1.1.1
• 13.1.1.2
• 13.1.1.3
• 13.1.1.4
• 14.1.0.0
• 14.1.0.1

License

• commercial

Website

• Vendor: https://f5.com/

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Entryinfo

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