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How CVE-2025-3787 Works
This vulnerability in PbootCMS 3.2.5 arises from improper input validation in the Image Handler component. Attackers can craft malicious requests containing external URLs, forcing the server to fetch arbitrary resources. The SSRF flaw occurs due to insufficient checks on user-supplied image URLs, allowing attackers to bypass restrictions and interact with internal systems. The vulnerability is exploitable remotely with high-privilege access (PR:H), but impact is limited to information leakage (VI:L) due to constrained attack vectors.
DailyCVE Form
Platform: PbootCMS
Version: 3.2.5
Vulnerability: SSRF
Severity: Medium
Date: 04/23/2025
What Undercode Say:
Exploitation:
POST /admin.php/Image/upload HTTP/1.1 Host: target.com Content-Type: multipart/form-data --BOUNDARY Content-Disposition: form-data; name="file"; filename="exploit.png" Content-Type: image/png http://internal-server/admin --BOUNDARY--
Mitigation:
1. Patch to PbootCMS 3.2.6+
2. Implement input validation:
function validateUrl($url) {
$parsed = parse_url($url);
return !in_array($parsed['host'], ['localhost', '127.0.0.1']);
}
Detection:
grep -r "file_get_contents($_FILES" /var/www/pbootcms
Analytics:
- Attack Surface: Limited to authenticated admins
- Exploit Complexity: Low (pre-requisite: admin access)
- Observed Payloads: Internal port scanning, AWS metadata queries
WAF Rule:
location ~ /Image/upload {
if ($args ~ "^(.)internal(.)") {
return 403;
}
}
Log Analysis:
SELECT FROM access_log WHERE request_uri LIKE '%/Image/upload%' AND status_code = 200;
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode
