CVE-2021-45821
📋 TL;DR
CVE-2021-45821 is a blind SQL injection vulnerability in Xbtit 3.1's chat history functionality that allows authenticated users to extract sensitive database information. Attackers can potentially obtain user credentials and achieve remote code execution. All Xbtit 3.1 installations with the vulnerable file are affected.
💻 Affected Systems
- Xbtit
📦 What is this software?
Xbtit by Btiteam
⚠️ Risk & Real-World Impact
Worst Case
Full database compromise leading to credential theft, privilege escalation, and remote code execution on the web server.
Likely Case
Extraction of sensitive user data including usernames and password hashes, potentially enabling account takeover.
If Mitigated
Limited data exposure if proper input validation and database permissions are enforced.
🎯 Exploit Status
Exploitation requires valid user credentials. SQL injection is blind but well-documented in public references.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not available
Vendor Advisory: Not available
Restart Required: No
Instructions:
No official patch exists. Remove or secure the vulnerable file manually.
🔧 Temporary Workarounds
Remove vulnerable file
linuxDelete or restrict access to ajaxchat/getHistoryChatData.php
rm /path/to/xbtit/ajaxchat/getHistoryChatData.php
Implement input validation
allAdd parameter sanitization for the sid parameter
Edit getHistoryChatData.php to validate sid as integer
🧯 If You Can't Patch
- Implement web application firewall rules to block SQL injection patterns
- Restrict network access to Xbtit installation to trusted users only
🔍 How to Verify
Check if Vulnerable:
Check if ajaxchat/getHistoryChatData.php exists in Xbtit installation and contains unsanitized sid parameter usage.Check Version:
Check Xbtit version in configuration files or admin panel.Verify Fix Applied:
Verify file removal or confirm parameter sanitization in the PHP code.📡 Detection & Monitoring
Log Indicators:
- Unusual SQL queries in database logs
- Multiple requests to getHistoryChatData.php with varying sid parameters
Network Indicators:
- HTTP POST/GET requests to ajaxchat/getHistoryChatData.php containing SQL syntax
SIEM Query:
source="web_logs" AND uri="/ajaxchat/getHistoryChatData.php" AND (query CONTAINS "UNION" OR query CONTAINS "SELECT" OR query CONTAINS "SLEEP")🔗 References
- https://emaragkos.gr/infosec-adventures/xbtit-3-1-sql-njection/
- https://github.com/btiteam/xbtit-3.1/blob/master/ajaxchat/getHistoryChatData.php
- https://github.com/btiteam/xbtit-3.1/issues/6
- https://emaragkos.gr/infosec-adventures/xbtit-3-1-sql-njection/
- https://github.com/btiteam/xbtit-3.1/blob/master/ajaxchat/getHistoryChatData.php
- https://github.com/btiteam/xbtit-3.1/issues/6
