CVE-2020-3253 : Security Advisory and Response
Learn about CVE-2020-3253, a vulnerability in Cisco Firepower Threat Defense Software that allows unauthorized access to device shells. Find mitigation steps and long-term security practices here.
A vulnerability in the support tunnel feature of Cisco Firepower Threat Defense (FTD) Software could allow an authenticated, local attacker to access the shell of an affected device even though expert mode is disabled.
Understanding CVE-2020-3253
This CVE involves a security vulnerability in Cisco Firepower Threat Defense Software that could be exploited by an attacker to gain unauthorized access to the affected device.
What is CVE-2020-3253?
The vulnerability in the support tunnel feature of Cisco Firepower Threat Defense (FTD) Software allows a local attacker to access the device's shell, bypassing expert mode restrictions. By manipulating the support tunnel configuration, an attacker could execute system commands with root access.
The Impact of CVE-2020-3253
The vulnerability poses a medium-severity risk with a CVSS base score of 6.7. If successfully exploited, an attacker could compromise the confidentiality, integrity, and availability of the affected device.
Technical Details of CVE-2020-3253
This section provides more in-depth technical insights into the vulnerability.
Vulnerability Description
The vulnerability arises from the improper configuration of the support tunnel feature in Cisco FTD Software, enabling unauthorized access to the device's shell.
Affected Systems and Versions
- Product: Cisco Firepower Threat Defense Software
- Vendor: Cisco
- Affected Version: Not applicable
Exploitation Mechanism
- Attacker must be authenticated and local
- Enable the support tunnel, set a key, and derive the tunnel password
- Allows running system commands with root access on the device
Mitigation and Prevention
Protecting systems from CVE-2020-3253 requires immediate actions and long-term security practices.
Immediate Steps to Take
- Disable the support tunnel feature if not essential
- Monitor network traffic for any suspicious activities
- Apply vendor-supplied patches or updates promptly
Long-Term Security Practices
- Implement the principle of least privilege for user access
- Regularly review and update security configurations
- Conduct security training for personnel to recognize and respond to threats
Patching and Updates
- Cisco may release patches or updates to address the vulnerability
- Stay informed about security advisories and apply patches as soon as they are available