CVE-2023-3533 — Path traversal in file upload functionality in `/main/webservices/additional_web

Path traversal in file upload functionality in `/main/webservices/additional_webservices.php` in Chamilo LMS <= v1.11.20 allows unauthenticated attackers to perform stored cross-site scripting attacks and obtain remote code execution via arbitrary file write.

01What is this vulnerability?

Path traversal in file upload functionality in `/main/webservices/additional_webservices.php` in Chamilo LMS <= v1.11.20 allows unauthenticated attackers to perform stored cross-site scripting attacks and obtain remote code execution via arbitrary file write.

02Affected products

Vendor	Product	Versions
Chamilo	Chamilo	0

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Open the Sigma generator with a pre-filled prompt for this CVE to draft a starting detection in your stack of choice:

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07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2023-11-28T07:06:43.738Z
• Last modified: 2024-08-02T06:55:03.594Z

09References

• support.chamilo.org — https://support.chamilo.org/projects/chamilo-18/wiki/security_issues#Issue-124-2…
• starlabs.sg — https://starlabs.sg/advisories/23/23-3533/
• github.com — https://github.com/chamilo/chamilo-lms/commit/37be9ce7243a30259047dd4517c48ff8b2…