Lucee Admin - RCE (CVE-2021-21307)
Description
Lucee Server is a dynamic, Java based (JSR-223), tag and scripting language used for rapid web application development. In Lucee Admin before versions 5.3.7.47, 5.3.6.68 or 5.3.5.96 there is an unauthenticated remote code exploit. This is fixed in versions 5.3.7.47, 5.3.6.68 or 5.3.5.96. As a workaround, one can block access to the Lucee Administrator.
psychologyCrowdSec Analysis
CVE-2021-21307 is a vulnerability in Lucee Server that allows unauthenticated remote code execution through insufficient access controls in the administrative image processing component.
CrowdSec has been tracking this vulnerability and its exploits since 15th of May 2024.
According to CrowdSec data, while opportunistic exploitation dominates, a portion of threat actors trying to exploit CVE-2021-21307 apply basic targeting methods such as port or service detection. This indicates emerging patterns of selective targeting. Telemetry from the CrowdSec network also shows that exploitation activity for CVE-2021-21307 remains steady week-over-week. Attack volumes are consistent with long-term trends, indicating sustained interest from threat actors. CVE-2021-21307 continues to be an active part of the threat landscape and will likely remain this way for the forseeable future.
Observed exploitation attempts involve requests to URLs containing /lucee/admin/imgprocess.cfm.
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| Event | Date |
|---|---|
| CVE Published | 2021-02-11 |
| Rule Released | 2024-05-15 |
| CrowdSec First Seen | 2024-05-15 |
Related Weaknesses
Remediation & Protection
External References
- https://github.com/lucee/Lucee/security/advisories/GHSA-2xvv-723c-8p7r
- https://github.com/lucee/Lucee/commit/6208ab7c44c61d26c79e0b0af10382899f57e1ca
- https://github.com/httpvoid/writeups/blob/main/Apple-RCE.md
- https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2021/CVE-2021-21307.yaml