CVE-2020-13630
📋 TL;DR
CVE-2020-13630 is a use-after-free vulnerability in SQLite's FTS3 extension that can lead to memory corruption and potential code execution. It affects applications using SQLite with the FTS3 snippet feature enabled. Attackers could exploit this to crash applications or execute arbitrary code.
💻 Affected Systems
- SQLite
- Applications embedding SQLite (Chrome, Firefox, Android, iOS apps, etc.)
📦 What is this software?
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⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise, data theft, or ransomware deployment.
Likely Case
Application crash (denial of service) or limited memory corruption leading to unstable behavior.
If Mitigated
Application crash without code execution if memory protections like ASLR are effective.
🎯 Exploit Status
Exploitation requires control over SQL queries using the snippet() function. Multiple proof-of-concept examples exist in disclosure references.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: SQLite 3.32.0 and later
Vendor Advisory: https://sqlite.org/releaselog/3_32_0.html
Restart Required: Yes
Instructions:
1. Download SQLite 3.32.0 or later from sqlite.org. 2. Replace vulnerable SQLite library. 3. Recompile applications using SQLite. 4. Restart affected services and applications.
🔧 Temporary Workarounds
Disable FTS3 Extension
allPrevent use of vulnerable snippet() function by disabling FTS3 extension at compile time.
Compile SQLite with -DSQLITE_ENABLE_FTS3=0 or -DSQLITE_ENABLE_FTS3_PARENTHESIS=0
Application-Level Filtering
allBlock or sanitize SQL queries containing snippet() function calls.
🧯 If You Can't Patch
- Implement strict input validation to block snippet() function calls in SQL queries
- Deploy memory protection mechanisms (ASLR, DEP) to reduce exploit effectiveness
🔍 How to Verify
Check if Vulnerable:
Check SQLite version: sqlite3 --version. If version < 3.32.0 and FTS3 is enabled, system is vulnerable.Check Version:
sqlite3 --versionVerify Fix Applied:
Verify SQLite version is ≥ 3.32.0 and test snippet() function with known malicious queries.📡 Detection & Monitoring
Log Indicators:
- Application crashes with memory access violations
- SQL errors mentioning fts3EvalNextRow or snippet()
Network Indicators:
- Unusual SQL query patterns containing snippet() function
SIEM Query:
source="application.log" AND ("segmentation fault" OR "access violation" OR "fts3EvalNextRow")🔗 References
- http://seclists.org/fulldisclosure/2020/Dec/32
- http://seclists.org/fulldisclosure/2020/Nov/19
- http://seclists.org/fulldisclosure/2020/Nov/20
- http://seclists.org/fulldisclosure/2020/Nov/22
- https://bugs.chromium.org/p/chromium/issues/detail?id=1080459
- https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf
- https://lists.debian.org/debian-lts-announce/2020/08/msg00037.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L7KXQWHIY2MQP4LNM6ODWJENMXYYQYBN/
- https://security.FreeBSD.org/advisories/FreeBSD-SA-20:22.sqlite.asc
- https://security.gentoo.org/glsa/202007-26
- https://security.netapp.com/advisory/ntap-20200608-0002/
- https://sqlite.org/src/info/0d69f76f0865f962
- https://support.apple.com/kb/HT211843
- https://support.apple.com/kb/HT211844
- https://support.apple.com/kb/HT211850
- https://support.apple.com/kb/HT211931
- https://support.apple.com/kb/HT211935
- https://support.apple.com/kb/HT211952
- https://usn.ubuntu.com/4394-1/
- https://www.oracle.com/security-alerts/cpujul2020.html
- https://www.oracle.com/security-alerts/cpuoct2020.html
- http://seclists.org/fulldisclosure/2020/Dec/32
- http://seclists.org/fulldisclosure/2020/Nov/19
- http://seclists.org/fulldisclosure/2020/Nov/20
- http://seclists.org/fulldisclosure/2020/Nov/22
- https://bugs.chromium.org/p/chromium/issues/detail?id=1080459
- https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf
- https://lists.debian.org/debian-lts-announce/2020/08/msg00037.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L7KXQWHIY2MQP4LNM6ODWJENMXYYQYBN/
- https://security.FreeBSD.org/advisories/FreeBSD-SA-20:22.sqlite.asc
- https://security.gentoo.org/glsa/202007-26
- https://security.netapp.com/advisory/ntap-20200608-0002/
- https://sqlite.org/src/info/0d69f76f0865f962
- https://support.apple.com/kb/HT211843
- https://support.apple.com/kb/HT211844
- https://support.apple.com/kb/HT211850
- https://support.apple.com/kb/HT211931
- https://support.apple.com/kb/HT211935
- https://support.apple.com/kb/HT211952
- https://usn.ubuntu.com/4394-1/
- https://www.oracle.com/security-alerts/cpujul2020.html
- https://www.oracle.com/security-alerts/cpuoct2020.html
