External risk intelligence

SQLite ALTER TABLE Use-After-Free Vulnerability

CVE advisorySeverity: CRITICAL (CVSS 9.8)

CVE-2020-11656

SQLite is a library embedded within other applications, not a standalone network service. While it is used in many products, it typically operates as a local file-based database or internal component. Public internet exposure is uncommon for the library itself and usually depends entirely on the specific, often internal, implementation of the parent application.

Halo Surface Signal: 2 out of 5 — less likely to be public-facing.

External exposure likelihood

Horizon Alert

Summary of the vulnerability and why it matters

A critical vulnerability has been identified in SQLite, a widely used database engine. This issue could allow for significant data corruption or unauthorized access if exploited. Given SQLite's broad integration into various software and systems, understanding its potential impact and confirming its presence within our environment is prudent.

  • Database engine has a critical flaw.
  • It's a core component in many products.
  • Confirm relevance and exposure to our systems.

Attack Path

How an attacker could exploit the issue

An attacker could exploit this vulnerability by targeting a system that uses a vulnerable version of SQLite. By crafting a specific SQL query, such as one involving an `ORDER BY` clause within a compound `SELECT` statement, they could trigger a use-after-free condition in the `ALTER TABLE` function. This could allow an attacker to corrupt memory, potentially leading to a denial of service or even arbitrary code execution on the affected system.

  • Attacker must have a way to send SQL commands.
  • Triggered by a malformed `ALTER TABLE` command.
  • Memory corruption and potential code execution.

Live Threat

Current exploitation, exposure, and threat context

A use-after-free vulnerability in SQLite's `ALTER TABLE` functionality could be triggered under specific conditions involving compound `SELECT` statements with an `ORDER BY` clause. This could potentially lead to denial of service or, in some scenarios, allow for code execution.

  • System data integrity.
  • When an application uses a vulnerable SQLite version.
  • Application instability or compromise.

Operational Fix

Recommended remediation, mitigation, and detection steps

Identifying the scope of this vulnerability requires understanding where the SQLite library is utilized within your environment. Application owners, platform teams, and infrastructure teams should collaborate to locate all instances of the affected technology, assess their reachability and business criticality, and then determine the appropriate remediation strategy based on the identified risk.

  • Application and platform teams own this issue.
  • Verify affected technology and criticality first.
  • Plan remediation based on risk assessment.

Supplementary metadata

Validate whether this threat affects your internet-facing exposure.

Halo Threat Intelligence helps prioritize remediation with Halo Surface Signal and H/A/L/O context. Start exposure validation with a free external attack surface trial.

Frequently asked questions

What is SQLite and how is it used?

SQLite is a lightweight, self-contained database engine. Unlike client-server databases, it is a library embedded directly into applications to store and manage data locally. Because it is highly portable and requires no separate server process, it is frequently integrated into a vast array of software, ranging from web browsers and mobile apps to complex infrastructure management tools and enterprise platforms.

What does the CVE-2020-11656 vulnerability mean?

This vulnerability is a use-after-free weakness, categorized as CWE-416. It occurs when a program continues to use a memory address after that memory has been freed. In this specific case, the flaw exists within the ALTER TABLE implementation. If triggered, it can cause memory corruption, which may result in application instability, a crash, or potentially allow an attacker to execute unauthorized code.

How is this SQLite vulnerability triggered?

An attacker triggers this bug by providing a specifically crafted SQL query to a vulnerable application. The issue specifically occurs when an ALTER TABLE command is combined with a compound SELECT statement that includes an ORDER BY clause. This condition does not trigger if the application does not use these specific SQL patterns or if the database interface does not accept user-controlled inputs for ALTER TABLE commands.

Is my system at risk?

Halo Surface Signal notes that while this is a critical flaw, SQLite is an embedded library, not a standalone network service. The actual risk depends on how your specific application uses the library and whether it allows external users to send SQL commands. Direct internet exposure of the underlying library is uncommon, as the risk is usually determined by the security posture of the parent application hosting the database.

What should I do if I use affected software?

Start by identifying which applications in your environment rely on SQLite versions up to 3.31.1. Collaborate with your platform and application teams to verify where these versions are running. Once identified, evaluate the criticality of those systems and coordinate with the respective vendors to apply available updates or patches that include the corrected version of the SQLite library.

References