CVE-2019-9937 : Vulnerability Insights and Analysis

A NULL Pointer Dereference vulnerability in SQLite version 3.27.2 can lead to issues when performing interleaving reads and writes within a single transaction using an fts5 virtual table.

Understanding CVE-2019-9937

This CVE involves a specific vulnerability in SQLite version 3.27.2 that can result in a NULL Pointer Dereference under certain conditions.

What is CVE-2019-9937?

In SQLite 3.27.2, interleaving reads and writes in a single transaction with an fts5 virtual table can trigger a NULL Pointer Dereference in the fts5ChunkIterate function in sqlite3.c. The vulnerability is associated with the files fts5_hash.c and fts5_index.c in the ext/fts5 directory.

The Impact of CVE-2019-9937

The vulnerability can be exploited by an attacker to cause a denial of service (DoS) condition or potentially execute arbitrary code on the affected system.

Technical Details of CVE-2019-9937

This section provides more in-depth technical details about the CVE.

Vulnerability Description

The vulnerability arises from improper handling of interleaving reads and writes within a single transaction using an fts5 virtual table in SQLite version 3.27.2, leading to a NULL Pointer Dereference in the fts5ChunkIterate function.

Affected Systems and Versions

SQLite version 3.27.2

Exploitation Mechanism

Attackers can exploit this vulnerability by performing interleaving reads and writes within a single transaction using an fts5 virtual table.

Mitigation and Prevention

Protecting systems from CVE-2019-9937 requires immediate actions and long-term security practices.

Immediate Steps to Take

Update SQLite to a non-vulnerable version.
Apply patches provided by the vendor.
Monitor vendor advisories for security updates.

Long-Term Security Practices

Regularly update software and libraries to the latest versions.
Implement secure coding practices to prevent similar vulnerabilities.

Patching and Updates

Apply security patches released by SQLite to address the vulnerability.