CVE-2020-5907 : Vulnerability Insights and Analysis

In BIG-IP versions 15.0.0-15.1.0.3, 14.1.0-14.1.2.3, 13.1.0-13.1.3.3, 12.1.0-12.1.5.1, and 11.6.1-11.6.5.1, an authorized user provided with access only to the TMOS Shell (tmsh) may be able to conduct arbitrary file read/writes via the built-in sftp functionality.

Understanding CVE-2020-5907

This CVE involves privilege escalation in F5 BIG-IP products.

What is CVE-2020-5907?

CVE-2020-5907 is a vulnerability in BIG-IP versions that allows an authorized user to perform arbitrary file read/writes through the tmsh interface.

The Impact of CVE-2020-5907

This vulnerability could be exploited by an authorized user to escalate privileges and potentially compromise the system's integrity.

Technical Details of CVE-2020-5907

This section provides more technical insights into the vulnerability.

Vulnerability Description

Authorized users with access to tmsh can exploit the sftp functionality to conduct unauthorized file read/writes.

Affected Systems and Versions

BIG-IP versions 15.0.0-15.1.0.3
BIG-IP versions 14.1.0-14.1.2.3
BIG-IP versions 13.1.0-13.1.3.3
BIG-IP versions 12.1.0-12.1.5.1
BIG-IP versions 11.6.1-11.6.5.1

Exploitation Mechanism

Authorized users with access to tmsh can abuse the built-in sftp functionality to perform unauthorized file operations.

Mitigation and Prevention

Protect your systems from CVE-2020-5907 with the following measures.

Immediate Steps to Take

Apply vendor-supplied patches promptly.
Restrict access to tmsh to authorized personnel only.
Monitor file read/write activities for suspicious behavior.

Long-Term Security Practices

Regularly update and patch BIG-IP systems.
Implement the principle of least privilege to restrict user access.
Conduct security training for personnel to recognize and report unusual activities.

Patching and Updates

Ensure timely installation of patches and updates provided by F5 to address this vulnerability.