F5 BIG-IP up to 14.1.0.1 sftp permission

Summaryinfo

A vulnerability described as critical has been identified in F5 BIG-IP up to 11.5.8/11.6.3.4/12.1.4/13.1.1.4/14.1.0.1. This affects an unknown function of the component sftp. Such manipulation leads to permission. This vulnerability is traded as CVE-2019-6617. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability was 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 issue is an unknown code block of the component sftp. The manipulation with an unknown input leads to a permission vulnerability. Using CWE to declare the problem leads to CWE-275. Impacted is integrity, and availability. CVE summarizes:

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, a user with the Resource Administrator role is able to overwrite sensitive low-level files (such as /etc/passwd) using SFTP to modify user permissions, without Advanced Shell access. This is contrary to our definition for the Resource Administrator (RA) role restrictions.

The bug was discovered 05/01/2019. The weakness was shared 05/03/2019 (Website). The advisory is shared for download at support.f5.com. This vulnerability is handled as CVE-2019-6617 since 01/22/2019. The attack may be launched remotely. The requirement for exploitation is a simple authentication. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $5k-$25k (estimation calculated on 09/12/2023). The MITRE ATT&CK project declares the attack technique as T1222.

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 371792 (F5 BIG-IP ASM,LTM,APM BIG-IP Resource Administrator User Privilege Manipulation Vulnerability(K38941195)).

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

The entries VDB-134386, VDB-134383, VDB-134382 and VDB-134381 are related to this item. VulDB is the best source for vulnerability data and more expert information about this specific topic.

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/

CPE 2.3info

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VulDB is the best source for vulnerability data and more expert information about this specific topic.

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