CVE-2020-3204 : Exploit Details and Defense Strategies

A vulnerability in the Tool Command Language (Tcl) interpreter of Cisco IOS Software and Cisco IOS XE Software could allow an authenticated, local attacker to execute arbitrary code with root privileges.

Understanding CVE-2020-3204

This CVE involves a vulnerability in the Tcl interpreter of Cisco IOS and IOS XE Software, potentially enabling attackers to execute malicious code with elevated privileges.

What is CVE-2020-3204?

The vulnerability arises from insufficient input validation in the Tcl interpreter, allowing attackers to load malicious Tcl code on affected devices and execute it with root privileges.

The Impact of CVE-2020-3204

CVSS Base Score: 6.7 (Medium Severity)
Attack Vector: Local
Confidentiality Impact: High
Integrity Impact: High
Availability Impact: High
The exploit could lead to memory corruption or unauthorized code execution on the underlying OS.

Technical Details of CVE-2020-3204

This section provides more in-depth technical insights into the vulnerability.

Vulnerability Description

The flaw allows authenticated local attackers with privileged EXEC credentials to run arbitrary code on the OS with root privileges due to inadequate input validation in the Tcl interpreter.

Affected Systems and Versions

Affected Product: Cisco IOS 12.2(53)SE1
Vendor: Cisco
Versions: n/a

Exploitation Mechanism

Attackers can exploit this vulnerability by injecting malicious Tcl code onto the targeted device, leveraging the lack of input validation to execute unauthorized commands.

Mitigation and Prevention

Protecting systems from CVE-2020-3204 requires immediate actions and long-term security measures.

Immediate Steps to Take

Apply vendor-recommended patches and updates promptly.
Monitor network traffic for any suspicious activities.
Restrict access to privileged EXEC credentials.

Long-Term Security Practices

Conduct regular security audits and vulnerability assessments.
Implement network segmentation to contain potential breaches.
Educate users on best practices for identifying and reporting security threats.

Patching and Updates

Regularly check for security advisories and updates from Cisco to address vulnerabilities and enhance system security.