CVE-2020-3296 Explained : Impact and Mitigation

Cisco Small Business RV Series Routers Stack Overflow Arbitrary Code Execution Vulnerabilities

Understanding CVE-2020-3296

This CVE involves multiple vulnerabilities in the web-based management interface of Cisco Small Business RV Series Routers, potentially allowing remote attackers to execute arbitrary code.

What is CVE-2020-3296?

The vulnerabilities in the routers' management interface could be exploited by authenticated remote attackers with administrative privileges to execute arbitrary code on the affected devices. The issues stem from insufficient boundary restrictions on user-supplied input to scripts in the web-based management interface.

The Impact of CVE-2020-3296

The vulnerabilities could enable attackers to crash the device or execute arbitrary code with root privileges on the underlying operating system, posing a significant security risk.

Technical Details of CVE-2020-3296

Vulnerability Description

The vulnerabilities allow attackers to exploit the web-based management interface, causing a stack overflow by sending crafted requests with overly large values.

Affected Systems and Versions

Product: Cisco Small Business RV Series Router Firmware
Vendor: Cisco
Affected Version: n/a

Exploitation Mechanism

Attack Complexity: Low
Attack Vector: Network
Privileges Required: High
User Interaction: None
Scope: Unchanged
CVSS Score: 7.2 (High)
Impact: High confidentiality, integrity, and availability

Mitigation and Prevention

Immediate Steps to Take

Apply vendor-provided patches promptly
Restrict network access to the management interface
Monitor for any unauthorized access or unusual activities

Long-Term Security Practices

Regularly update firmware and security patches
Implement strong password policies and multi-factor authentication
Conduct security training for users and administrators

Patching and Updates

Refer to the vendor's security advisory for patch availability and installation instructions