CVE-2022-31147
📋 TL;DR
The jQuery Validation Plugin versions before 1.19.5 contain a regular expression denial of service (ReDoS) vulnerability in the url2 method. Attackers can cause excessive CPU consumption and service disruption by submitting specially crafted URLs. This affects any web application using vulnerable versions of the plugin for form validation.
💻 Affected Systems
- jQuery Validation Plugin (jquery-validation)
📦 What is this software?
Jquery Validation by Jqueryvalidation
⚠️ Risk & Real-World Impact
Worst Case
Complete service unavailability due to CPU exhaustion, potentially affecting all users of the application.
Likely Case
Degraded performance and intermittent service disruptions for users submitting forms with URL validation.
If Mitigated
Minimal impact with proper input validation and rate limiting in place.
🎯 Exploit Status
Exploitation requires the attacker to submit malicious input to the vulnerable url2 method. The advisory includes technical details that could be used to create exploits.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.19.5
Vendor Advisory: https://github.com/jquery-validation/jquery-validation/security/advisories/GHSA-ffmh-x56j-9rc3
Restart Required: No
Instructions:
1. Update the jquery-validation dependency to version 1.19.5 or later. 2. Replace the vulnerable library file with the patched version. 3. Clear browser caches to ensure clients load the updated version.
🔧 Temporary Workarounds
Disable URL validation
allRemove or disable the url2 validation method from forms
Modify form validation rules to exclude url2 validation
Implement server-side validation
allAdd server-side validation for URLs to complement client-side validation
Implement URL validation in backend code before processing
🧯 If You Can't Patch
- Implement rate limiting on form submissions to prevent DoS attacks
- Deploy WAF rules to detect and block malicious URL patterns
🔍 How to Verify
Check if Vulnerable:
Check the version of jquery-validation.js in your web application. Versions below 1.19.5 are vulnerable.Check Version:
grep -r 'jquery-validation' package.json || find . -name '*jquery-validation*' -exec grep -l 'version' {} \;Verify Fix Applied:
Verify that jquery-validation version is 1.19.5 or higher in your application's dependencies and loaded files.📡 Detection & Monitoring
Log Indicators:
- Multiple failed form submissions with unusual URL patterns
- High CPU usage spikes coinciding with form submissions
Network Indicators:
- Unusually long URL parameters in POST requests to forms
- Repeated form submissions with similar URL patterns
SIEM Query:
source="web_logs" AND (url="*url2*" OR form_data="*url2*") AND status=400🔗 References
- https://github.com/jquery-validation/jquery-validation/commit/5bbd80d27fc6b607d2f7f106c89522051a9fb0dd
- https://github.com/jquery-validation/jquery-validation/releases/tag/1.19.5
- https://github.com/jquery-validation/jquery-validation/security/advisories/GHSA-ffmh-x56j-9rc3
- https://github.com/jquery-validation/jquery-validation/commit/5bbd80d27fc6b607d2f7f106c89522051a9fb0dd
- https://github.com/jquery-validation/jquery-validation/releases/tag/1.19.5
- https://github.com/jquery-validation/jquery-validation/security/advisories/GHSA-ffmh-x56j-9rc3
