CVE-2021-39295 : What You Need to Know

This CVE record involves a vulnerability in OpenBMC 2.9 that allows attackers to cause a denial of service via crafted IPMI messages.

Understanding CVE-2021-39295

OpenBMC 2.9 is susceptible to crafted IPMI messages that enable an attacker to disrupt the BMC's operation through the netipmid (IPMI lan+) interface.

What is CVE-2021-39295?

The vulnerability in OpenBMC 2.9 permits an attacker to execute a denial-of-service attack on the BMC by sending specially crafted IPMI messages through the netipmid interface.

The Impact of CVE-2021-39295

This vulnerability could result in a denial of service to the BMC, affecting the system's availability and potentially disrupting critical operations.

Technical Details of CVE-2021-39295

OpenBMC 2.9 is affected by a specific vulnerability that allows for denial-of-service attacks through crafted IPMI messages.

Vulnerability Description

The flaw in OpenBMC 2.9 enables attackers to disrupt the BMC's functionality by sending malicious IPMI messages via the netipmid (IPMI lan+) interface.

Affected Systems and Versions

Vendor: n/a
Product: n/a
Versions: All versions are impacted.

Exploitation Mechanism

The vulnerability can be exploited by sending malicious IPMI messages through the netipmid (IPMI lan+) interface, causing a denial of service to the BMC.

Mitigation and Prevention

Taking immediate steps to address and prevent the CVE-2021-39295 vulnerability is crucial.

Immediate Steps to Take

Update OpenBMC to a patched version that addresses the vulnerability.
Monitor network traffic for any suspicious IPMI messages.
Implement proper access controls to restrict IPMI message injections.

Long-Term Security Practices

Regularly update and patch OpenBMC to prevent vulnerabilities.
Conduct security assessments and audits on the BMC infrastructure.

Patching and Updates

Apply the latest security patches provided by OpenBMC to mitigate the vulnerability effectively.