CVE-2020-13871 – CVE-2020-13871 is a use-after-free vulnerabilit... (How to Fix)

Q: What is the severity of CVE-2020-13871?

CVE-2020-13871 has a CVSS score of 7.5 (HIGH). CVE-2020-13871 is a use-after-free vulnerability in SQLite's window function implementation that could allow memory corruption. This affects applications using SQLite 3.32.2 or earlier versions with window functions enabled. Attackers could potentially execute arbitrary code or cause denial of service.

📋 TL;DR

CVE-2020-13871 is a use-after-free vulnerability in SQLite's window function implementation that could allow memory corruption. This affects applications using SQLite 3.32.2 or earlier versions with window functions enabled. Attackers could potentially execute arbitrary code or cause denial of service.

💻 Affected Systems

Products:

SQLite
Applications using SQLite library

Versions: SQLite 3.32.2 and earlier (specifically versions with window function support)

Operating Systems: All platforms running SQLite

Default Config Vulnerable: ⚠️ Yes

Notes: Vulnerability requires window functions to be used in SQL queries. Many applications may not use this feature.

📦 What is this software?

⚠️ Risk & Real-World Impact

🔴

Worst Case

Remote code execution leading to complete system compromise if SQLite is used in a network-facing service with window functions enabled.

🟠

Likely Case

Application crash or denial of service when processing malicious SQL queries with window functions.

🟢

If Mitigated

Limited impact if window functions are disabled or proper input validation prevents malicious queries.

🌐 Internet-Facing: MEDIUM - Risk depends on whether SQLite is exposed via network services and window functions are enabled.

🏢 Internal Only: LOW - Most SQLite usage is embedded/local, reducing attack surface.

🎯 Exploit Status

Public PoC: ⚠️ Yes

Weaponized: LIKELY

Unauthenticated Exploit: ⚠️ Yes

Complexity: MEDIUM

Exploitation requires crafting specific SQL queries with window functions. Proof-of-concept code exists in security advisories.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: SQLite 3.32.3 and later

Vendor Advisory: https://www.sqlite.org/releaselog/3_32_3.html

Restart Required: Yes

Instructions:

1. Download SQLite 3.32.3 or later from sqlite.org. 2. Replace vulnerable SQLite library. 3. Recompile applications if statically linked. 4. Restart affected services.

🔧 Temporary Workarounds

Disable window functions

all

Configure applications to avoid using SQL window functions

Application-specific configuration - no universal command

Input validation

all

Implement strict SQL query validation to block window function syntax

Application-level implementation required

🧯 If You Can't Patch

Implement network segmentation to isolate SQLite-dependent services
Deploy application-level firewalls to filter SQL queries containing window functions

🔍 How to Verify

Check if Vulnerable:

Check SQLite version: sqlite3 --version. If version is 3.32.2 or earlier, system is vulnerable.

Check Version:

sqlite3 --version

Verify Fix Applied:

Verify SQLite version is 3.32.3 or later: sqlite3 --version

📡 Detection & Monitoring

Log Indicators:

Application crashes with memory access violations
Unexpected SQL query patterns with window functions

Network Indicators:

SQL queries containing OVER() clause or window function syntax in network traffic

SIEM Query:

SELECT * FROM logs WHERE message LIKE '%sqlite%' AND (message LIKE '%segfault%' OR message LIKE '%access violation%')

📊 Metadata

CVE ID: CVE-2020-13871

CVSS v3 Score: 7.5 (HIGH)

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CWE: CWE-416

Published: June 6, 2020

Last Updated: November 21, 2024

🔗 References

https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf Patch,Third Party Advisory
https://lists.debian.org/debian-lts-announce/2020/08/msg00037.html Mailing List,Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BN32AGQPMHZRNM6P6L5GZPETOWTGXOKP/
https://security.gentoo.org/glsa/202007-26 Mitigation,Third Party Advisory
https://security.netapp.com/advisory/ntap-20200619-0002/ Third Party Advisory
https://www.oracle.com/security-alerts/cpuApr2021.html Third Party Advisory
https://www.oracle.com/security-alerts/cpujan2021.html Third Party Advisory
https://www.sqlite.org/src/info/79eff1d0383179c4 Patch,Vendor Advisory
https://www.sqlite.org/src/info/c8d3b9f0a750a529 Exploit,Vendor Advisory
https://www.sqlite.org/src/info/cd708fa84d2aaaea Exploit,Vendor Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf Patch,Third Party Advisory
https://lists.debian.org/debian-lts-announce/2020/08/msg00037.html Mailing List,Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BN32AGQPMHZRNM6P6L5GZPETOWTGXOKP/
https://security.gentoo.org/glsa/202007-26 Mitigation,Third Party Advisory
https://security.netapp.com/advisory/ntap-20200619-0002/ Third Party Advisory
https://www.oracle.com/security-alerts/cpuApr2021.html Third Party Advisory
https://www.oracle.com/security-alerts/cpujan2021.html Third Party Advisory
https://www.sqlite.org/src/info/79eff1d0383179c4 Patch,Vendor Advisory
https://www.sqlite.org/src/info/c8d3b9f0a750a529 Exploit,Vendor Advisory
https://www.sqlite.org/src/info/cd708fa84d2aaaea Exploit,Vendor Advisory

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