CVE-2020-27207
📋 TL;DR
CVE-2020-27207 is a use-after-free vulnerability in SQLCipher 4.x that allows remote denial of service attacks. Attackers can exploit this via SQL injection to execute crafted SQL commands, causing unexpected RAM data reads and potential application crashes. This affects applications using vulnerable SQLCipher versions for encrypted database operations.
💻 Affected Systems
- Zetetic SQLCipher
📦 What is this software?
Sqlcipher by Zetetic
⚠️ Risk & Real-World Impact
Worst Case
Complete application crash leading to denial of service, potential memory corruption that could enable arbitrary code execution in specific conditions.
Likely Case
Application instability and crashes resulting in denial of service, potentially exposing sensitive memory contents.
If Mitigated
Limited impact with proper input validation and SQL injection prevention, though underlying vulnerability remains.
🎯 Exploit Status
Exploitation requires SQL injection capability. The vulnerability is triggered via crafted SQL commands targeting sqlcipher_codec_pragma.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 4.4.1
Vendor Advisory: https://github.com/sqlcipher/sqlcipher/compare/v4.4.0...v4.4.1
Restart Required: Yes
Instructions:
1. Update SQLCipher to version 4.4.1 or later. 2. Recompile applications using SQLCipher. 3. Restart affected services. 4. Test database functionality after update.
🔧 Temporary Workarounds
Input Validation and SQL Injection Prevention
allImplement strict input validation and parameterized queries to prevent SQL injection attacks that could trigger this vulnerability.
Database Access Restriction
allLimit database access to trusted sources only and implement proper authentication/authorization controls.
🧯 If You Can't Patch
- Implement web application firewall (WAF) rules to block SQL injection attempts
- Isolate affected systems from untrusted networks and implement network segmentation
🔍 How to Verify
Check if Vulnerable:
Check SQLCipher version in use. If version is 4.x and less than 4.4.1, the system is vulnerable.Check Version:
For applications: Check build configuration or runtime SQLCipher version. For command line: sqlcipher --versionVerify Fix Applied:
Verify SQLCipher version is 4.4.1 or later. Test database operations to ensure functionality is maintained.📡 Detection & Monitoring
Log Indicators:
- Application crashes with memory access violations
- Unusual SQL query patterns with codec_pragma
- Database connection failures
Network Indicators:
- SQL injection attempts in web traffic
- Unusual database query patterns
SIEM Query:
search 'sqlcipher' OR 'codec_pragma' AND (crash OR memory OR violation) OR search for SQL injection patterns in web logs🔗 References
- https://github.com/sqlcipher/sqlcipher/compare/v4.4.0...v4.4.1
- https://www.telekom.com/en/corporate-responsibility/data-protection-data-security/security/details/advisories-504842
- https://www.telekom.com/resource/blob/612796/9f221708832a465f03585a45d7f59b45/dl-201112-denial-of-serviceen-data.pdf
- https://github.com/sqlcipher/sqlcipher/compare/v4.4.0...v4.4.1
- https://www.telekom.com/en/corporate-responsibility/data-protection-data-security/security/details/advisories-504842
- https://www.telekom.com/resource/blob/612796/9f221708832a465f03585a45d7f59b45/dl-201112-denial-of-serviceen-data.pdf
