CVE-2024-22191
📋 TL;DR
A stored cross-site scripting (XSS) vulnerability in Avo's key_value field allows attackers to inject malicious JavaScript that executes in victims' browsers. This affects Ruby on Rails applications using Avo admin panels versions 3.2.3 and 2.46.0 (and possibly older versions). Attackers could steal sensitive information, hijack accounts, or redirect users to malicious sites.
💻 Affected Systems
- Avo (Ruby on Rails admin panel framework)
📦 What is this software?
Avo by Avohq
Avo by Avohq
⚠️ Risk & Real-World Impact
Worst Case
Complete account takeover, sensitive data exfiltration, and redirection to phishing sites leading to credential theft and lateral movement.
Likely Case
Session hijacking, theft of admin panel credentials, and unauthorized access to administrative functions.
If Mitigated
Limited impact with proper input validation, output encoding, and Content Security Policy (CSP) headers in place.
🎯 Exploit Status
Exploitation requires access to create or modify key_value field content. The vulnerability is straightforward to exploit once an attacker gains appropriate access.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Avo 3.2.4 and 2.47.0
Vendor Advisory: https://github.com/avo-hq/avo/security/advisories/GHSA-ghjv-mh6x-7q6h
Restart Required: Yes
Instructions:
1. Update Gemfile to specify 'avo' gem version '>=3.2.4' or '>=2.47.0'. 2. Run 'bundle update avo'. 3. Restart the Rails application server.
🔧 Temporary Workarounds
Input Validation and Sanitization
allImplement server-side validation and sanitization for key_value field inputs before storage.
Content Security Policy (CSP)
allImplement strict CSP headers to mitigate XSS impact by restricting script execution sources.
🧯 If You Can't Patch
- Disable or restrict access to the key_value field functionality in Avo admin panels.
- Implement web application firewall (WAF) rules to detect and block XSS payloads in requests.
🔍 How to Verify
Check if Vulnerable:
Check Gemfile.lock for avo gem version 3.2.3 or 2.46.0 (or potentially older). Review if key_value field is used without input sanitization.Check Version:
grep -A 1 'avo' Gemfile.lockVerify Fix Applied:
Confirm avo gem version is 3.2.4 or higher (for v3) or 2.47.0 or higher (for v2) in Gemfile.lock after update.📡 Detection & Monitoring
Log Indicators:
- Unusual JavaScript payloads in POST/PUT requests to key_value endpoints
- Multiple failed login attempts from unexpected locations following key_value updates
Network Indicators:
- Outbound connections to unknown domains following admin panel access
- Unexpected redirects from admin panel pages
SIEM Query:
source="rails_logs" AND (message:"key_value" AND (message:"script" OR message:"javascript" OR message:"onerror"))🔗 References
- https://github.com/avo-hq/avo/commit/51bb80b181cd8e31744bdc4e7f9b501c81172347
- https://github.com/avo-hq/avo/commit/fc92a05a8556b1787c8694643286a1afa6a71258
- https://github.com/avo-hq/avo/security/advisories/GHSA-ghjv-mh6x-7q6h
- https://github.com/avo-hq/avo/commit/51bb80b181cd8e31744bdc4e7f9b501c81172347
- https://github.com/avo-hq/avo/commit/fc92a05a8556b1787c8694643286a1afa6a71258
- https://github.com/avo-hq/avo/security/advisories/GHSA-ghjv-mh6x-7q6h
