CVE-2023-7104: SQLite Heap-Based Buffer Overflow Flaw

CVE-2023-7104 Overview

A critical heap-based buffer overflow vulnerability has been identified in SQLite up to version 3.43.0. This issue affects the sessionReadRecord function located in the file ext/session/sqlite3session.c within the make alltest Handler component. The vulnerability allows attackers to manipulate input in a way that triggers a heap-based buffer overflow condition, potentially leading to memory corruption and application crashes.

Critical Impact
This heap-based buffer overflow in SQLite's session extension can be exploited remotely over the network without authentication, potentially compromising confidentiality, integrity, and availability of affected systems.

Affected Products

SQLite versions up to and including 3.43.0
Fedora 38
Fedora 39

Discovery Timeline

2023-12-29 - CVE-2023-7104 published to NVD
2025-11-03 - Last updated in NVD database

Technical Details for CVE-2023-7104

Vulnerability Analysis

This vulnerability is classified as a heap-based buffer overflow (CWE-122) and more broadly as improper restriction of operations within the bounds of a memory buffer (CWE-119). The flaw exists in SQLite's session extension, specifically within the sessionReadRecord function that handles record processing during session operations.

When the session extension processes certain malformed or specially crafted input, the sessionReadRecord function fails to properly validate buffer boundaries before writing data. This allows an attacker to overflow heap memory, potentially overwriting adjacent memory structures. The network-accessible nature of this vulnerability means that applications using SQLite with exposed interfaces could be targeted remotely without requiring user interaction or authentication.

Root Cause

The root cause lies in inadequate bounds checking within the sessionReadRecord function in ext/session/sqlite3session.c. The function processes session records without properly validating that the data being read fits within the allocated buffer space. When processing malicious input, this oversight allows write operations to exceed buffer boundaries, resulting in heap memory corruption.

Attack Vector

The vulnerability can be exploited through network-based attack vectors. An attacker can craft malicious input data that, when processed by the sessionReadRecord function, causes the buffer overflow. The attack does not require any privileges or user interaction, making it particularly dangerous for internet-facing applications that utilize SQLite's session extension.

The exploitation mechanism involves providing manipulated session data that exceeds expected boundaries during the record reading process. When the vulnerable function attempts to process this data, it writes beyond the allocated heap buffer, potentially allowing the attacker to corrupt memory structures, crash the application, or in more severe scenarios, achieve code execution.

Detection Methods for CVE-2023-7104

Indicators of Compromise

Unexpected crashes or memory corruption errors in applications using SQLite session extensions
Abnormal memory allocation patterns or heap corruption warnings in system logs
Unusual network traffic patterns targeting SQLite-enabled services with malformed session data

Detection Strategies

Monitor application logs for SQLite-related crashes, particularly those involving the session extension component
Implement memory monitoring tools to detect heap corruption or out-of-bounds access patterns
Use intrusion detection systems (IDS) to identify suspicious payloads targeting SQLite session handling functionality

Monitoring Recommendations

Enable verbose logging for SQLite operations, especially session-related functions
Deploy endpoint detection and response (EDR) solutions capable of detecting heap overflow exploitation attempts
Regularly audit SQLite version deployments across your infrastructure to ensure vulnerable versions are identified

How to Mitigate CVE-2023-7104

Immediate Actions Required

Update SQLite to a patched version beyond 3.43.0 as soon as available
Review and restrict network access to applications using SQLite session extensions
Apply vendor-provided patches from Fedora or other distribution maintainers for affected systems
Consider disabling SQLite session extension functionality if not required by your application

Patch Information

SQLite has released a patch to address this vulnerability. The fix is available through the SQLite Source Code repository at commit 0e4e7a05c4204b47. Organizations should apply this patch or upgrade to a version of SQLite that includes this fix.

Additional security advisories and patches are available from:

Workarounds

Restrict network access to SQLite-dependent applications using firewall rules or network segmentation
Implement input validation at the application layer to sanitize data before it reaches SQLite session functions
Consider using SQLite in WAL (Write-Ahead Logging) mode with restricted session extension usage until patching is complete

bash

# Verify current SQLite version and check if vulnerable
sqlite3 --version

# For Fedora systems, update SQLite package
sudo dnf update sqlite

# For Debian/Ubuntu systems
sudo apt update && sudo apt upgrade libsqlite3-0

# Restrict network access to SQLite services (example firewall rule)
sudo iptables -A INPUT -p tcp --dport [SQLITE_PORT] -s [TRUSTED_IP_RANGE] -j ACCEPT
sudo iptables -A INPUT -p tcp --dport [SQLITE_PORT] -j DROP