F5 BIG-IP up to 11.6.5.2/12.1.5.2/13.1.3.3 Access Control default permission

Summaryinfo

A vulnerability was found in F5 BIG-IP up to 11.6.5.2/12.1.5.2/13.1.3.3. It has been rated as critical. This affects an unknown part of the component Access Control. The manipulation leads to default permission. This vulnerability is uniquely identified as CVE-2020-5906. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability was found in F5 BIG-IP up to 11.6.5.2/12.1.5.2/13.1.3.3 (Firewall Software) and classified as critical. This issue affects an unknown function of the component Access Control. The manipulation with an unknown input leads to a default permission vulnerability. Using CWE to declare the problem leads to CWE-276. During installation, installed file permissions are set to allow anyone to modify those files. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

In versions 13.1.0-13.1.3.3, 12.1.0-12.1.5.2, and 11.6.1-11.6.5.2, the BIG-IP system does not properly enforce the access controls for the scp.blacklist files. This allows Admin and Resource Admin users with Secure Copy (SCP) protocol access to read and overwrite blacklisted files via SCP.

The weakness was disclosed 07/01/2020 (Website). The advisory is shared at support.f5.com. The identification of this vulnerability is CVE-2020-5906 since 01/06/2020. The attack may be initiated remotely. The successful exploitation requires a simple authentication. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 07/02/2020). MITRE ATT&CK project uses the attack technique T1222 for this issue.

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

The entries VDB-157578, VDB-157576, VDB-157575 and VDB-157574 are pretty similar. Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

• Firewall Software

Vendor

• F5

Name

• BIG-IP

Version

• 11.6.5.0
• 11.6.5.1
• 11.6.5.2
• 12.1.5.0
• 12.1.5.1
• 12.1.5.2
• 13.1.3.0
• 13.1.3.1
• 13.1.3.2
• 13.1.3.3

License

• commercial

Website

• Vendor: https://f5.com/

CPE 2.3info

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CPE 2.2info

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Entryinfo

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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