CVE-2020-3291 Explained : Impact and Mitigation

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

Understanding CVE-2020-3291

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-2020-3291?

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 Impact of CVE-2020-3291

The vulnerabilities could lead to a stack overflow by sending crafted requests with overly large values, potentially causing the device to crash or allowing the attacker to execute code with root privileges.

Technical Details of CVE-2020-3291

Vulnerability Description

The vulnerabilities are a result of insufficient boundary restrictions on user-supplied input to scripts in the web-based management interface.

Affected Systems and Versions

Product: Cisco Small Business RV Series Router Firmware
Vendor: Cisco
Versions: Not Applicable

Exploitation Mechanism

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

Mitigation and Prevention

Immediate Steps to Take

Apply vendor-provided patches and updates promptly
Restrict network access to the management interface
Monitor for any unusual network activity

Long-Term Security Practices

Regularly update firmware and software
Implement strong password policies and multi-factor authentication
Conduct regular security assessments and audits

Patching and Updates

Refer to the vendor's security advisory for patching instructions and updates