CISA Flags Apache Struts CVE-2016-3081 Command Injection Risk

En bref

• CVE-2016-3081 affects Apache Struts through Dynamic Method Invocation.
• Remote attackers can achieve command injection and arbitrary code execution, including remote code execution.
• CISA guidance points to mitigations, vendor instructions, and exposure evaluation.
• Agencies should patch under BOD 26-04 or stop using the product if no fix is available.

In 2016, a vulnerability tracked as CVE-2016-3081 was disclosed in Apache Struts, tied to the Dynamic Method Invocation feature. The weakness permits remote attackers to inject commands and achieve arbitrary code execution, with the potential for full remote code execution on vulnerable servers. CISA has highlighted the issue in mitigation guidance, indicating that unpatched deployments still warrant attention.

Affected parties are organizations that run Apache Struts, especially any instance reachable from the internet. K-12 districts and government agencies often inherit legacy web applications that may embed this framework without current support. Because exploitation does not require local access, an exposed service can be targeted directly by external actors.

The impact is serious: command injection and code execution can let an intruder run system commands, alter application behavior, or pivot into connected systems. Even though the flaw dates to 2016, old components frequently remain in production when applications are not actively maintained. That persistence makes inventory and exposure review essential rather than optional.

Recommended actions include applying available mitigations, following vendor instructions, and evaluating internet exposure. Where BOD 26-04 applies, patch according to its requirements. If a supported update is not available, discontinue use of the affected component. Administrators should also watch for scanning activity, unusual child processes, and signs of exploitation, and confirm remediation through testing and monitoring.

À faire maintenant

1. Inventory every Apache Struts deployment and confirm whether Dynamic Method Invocation is enabled or reachable.
2. Determine internet exposure immediately; restrict or block external access to affected services until remediation is complete.
3. Apply Apache mitigations and vendor patches, and remediate under BOD 26-04 timelines where applicable.
4. If no supported fix exists, remove, replace, or retire the vulnerable component rather than leaving it exposed.
5. Review web, application, and process logs for command injection attempts, unexpected execution, or post-exploitation activity.
6. After patching, retest affected applications and run a vulnerability scan to verify the issue is resolved.
7. Document actions and retain evidence for CISA or oversight reporting requirements.

Source originale

CISA Known Exploited Vulnerabilities