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A critical vulnerability has been discovered in Vite, a popular frontend development tooling framework. Versions prior to 6.2.3, 6.1.2, 6.0.12, 5.4.15, and 4.5.10 are affected. The exploit allows attackers to retrieve arbitrary file contents by manipulating URL substrings.
Vulnerability Details
By appending substrings like `?raw??` or `?import&raw??` to a URL, an attacker can bypass security checks and access sensitive files (e.g., /etc/passwd). The issue arises due to improper handling of trailing delimiters (?) in regular expressions used for query validation.
Exploit Payload Structure:
/@fs/etc/passwd?<WORD>?raw
– `@fs` – Restriction bypass mechanism
– `/etc/passwd` – Target file
– `
– `raw` – Forces file import as a string
Proof of Concept (PoC):
You Should Know: Mitigation & Detection
1. Patch Immediately
Upgrade to the latest secure versions:
- Vite 6.2.3+
- Vite 6.1.2+
- Vite 6.0.12+
- Vite 5.4.15+
- Vite 4.5.10+
2. Implement Input Validation
Use the following regex to block malicious requests:
[regex]
\/@fs\/([a-zA-Z0-9_-]+\/)([a-zA-Z0-9_-]+).+?\?raw
[/regex]
3. Server-Side Protection (Nginx/Apache)
Nginx Rule:
location ~ \/@fs\/.\?raw {
deny all;
return 403;
}
Apache Rule:
<LocationMatch "/@fs/.\?raw"> Require all denied </LocationMatch>
4. Linux File Permissions Hardening
Restrict access to sensitive files:
chmod 600 /etc/passwd chmod 700 /etc/shadow
5. Log Monitoring
Check for exploitation attempts:
grep -r "/@fs" /var/log/nginx/access.log
What Undercode Say
This vulnerability highlights the risks of improper input validation in dev tooling. Always:
– Patch early – Zero-day exploits evolve rapidly.
– Use WAFs – Deploy Web Application Firewalls to filter malicious payloads.
– Audit dependencies – Regularly check for CVEs in third-party tools.
Additional Security Commands:
Check running services for vulnerabilities netstat -tulnp Verify file integrity sha256sum /etc/passwd Monitor real-time processes lsof -i :80
Expected Output:
A secure, patched Vite deployment with regex-based request filtering and active log monitoring.
Vite Official Security Advisory
References:
Reported By: Saurabh B294b21aa – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
