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CVE-2020-3139 : Exploit Details and Defense Strategies

Learn about CVE-2020-3139, a vulnerability in Cisco APIC allowing remote attackers to bypass IP table rules. Find mitigation steps and affected versions here.

A vulnerability in the out of band (OOB) management interface IP table rule programming for Cisco Application Policy Infrastructure Controller (APIC) could allow an unauthenticated, remote attacker to bypass configured deny entries for specific IP ports.

Understanding CVE-2020-3139

This CVE involves a security vulnerability in Cisco APIC that could enable an attacker to bypass IP table rules.

What is CVE-2020-3139?

The vulnerability in Cisco APIC allows an unauthenticated remote attacker to bypass configured deny entries for specific IP ports, potentially permitting unauthorized access to the out-of-band management interface.

The Impact of CVE-2020-3139

        CVSS Base Score: 5.3 (Medium Severity)
        Attack Vector: Network
        Attack Complexity: Low
        Integrity Impact: Low
        No privileges required for exploitation

Technical Details of CVE-2020-3139

This section provides detailed technical information about the vulnerability.

Vulnerability Description

The vulnerability is a result of a programming logic error in the configuration of specific IP table entries, allowing an attacker to send traffic to the OOB management interface and bypass configured IP table rules.

Affected Systems and Versions

        Affected Product: Cisco Application Policy Infrastructure Controller (APIC)
        Vendor: Cisco
        Affected Versions: Prior to 4.2(3j)

Exploitation Mechanism

        An attacker can exploit this vulnerability by sending traffic to the OOB management interface on the targeted device.
        Successful exploitation could allow the attacker to bypass configured IP table rules and drop specific IP port traffic.

Mitigation and Prevention

Protecting systems from this vulnerability requires immediate actions and long-term security practices.

Immediate Steps to Take

        Apply the necessary security patches provided by Cisco.
        Monitor network traffic for any suspicious activity targeting the OOB management interface.

Long-Term Security Practices

        Regularly update and patch all software and firmware to prevent vulnerabilities.
        Implement network segmentation to limit the impact of potential attacks.

Patching and Updates

        Ensure that all affected systems are updated to Cisco APIC Release 4.2(3j) or later to mitigate the vulnerability.

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