External risk intelligence

Chrome WebAudio Use-After-Free Vulnerability

CVE advisoryKnown Exploit

CVE-2019-13720

A vulnerability in Google Chrome's WebAudio component allows remote attackers to exploit heap corruption via a crafted HTML page. This can lead to unauthorized system access or data compromise for affected organizations. Business risk includes potential data breaches and service disruptions.

3Halo Surface Signal

Use After Free

Google Chrome

before 78.0.3904.8715.1

External exposure likelihood

Halo Surface Signal score for CVE-2019-13720

The vulnerability exists in the WebAudio component of a web browser, requiring a user to visit a crafted HTML page. While browsers are internet-facing applications, this specific attack surface relies on user interaction (browsing to a malicious site) rather than being an internet-accessible service, endpoint, or gateway that is inherently reachable or listening for incoming connections.

Horizon Alert

Summary of the vulnerability and why it matters

The WebAudio component in Google Chrome is susceptible to a use-after-free vulnerability. This flaw enables remote attackers to cause heap corruption through specially crafted HTML pages. Such an exploit could lead to a compromise of system integrity and confidentiality, potentially allowing unauthorized access to sensitive data or disruption of services. The impact on affected organizations could include significant data breaches and operational disruptions.

  • Vulnerable web browser component
  • Heap corruption flaw
  • Data compromise and service disruption

Attack Path

How an attacker could exploit the issue

A remote attacker can exploit heap corruption in the WebAudio component of Google Chrome through a specially crafted HTML page. This vulnerability allows for potential control over the affected system by an attacker. The exploitation requires a user to interact with a malicious web page.

  • Exposure requires user to visit a crafted page.
  • Attacker gains control by triggering heap corruption.
  • Impact includes potential system control.

Live Threat

Current exploitation, exposure, and threat context

The described vulnerability could allow attackers to execute malicious code by corrupting memory. This is achieved through a specially crafted webpage, posing a risk to organizations whose employees may encounter such pages. The exploitation requires user interaction, such as clicking a malicious link or visiting a compromised website.

  • Likely attacker skill: Moderate.
  • Required access: User visits malicious page.
  • Business risk: High, potential for data compromise.

Priority actions

Operational Fix

Recommended remediation, mitigation, and detection steps

This vulnerability, found in Google Chrome's WebAudio component, could allow remote attackers to cause heap corruption through a crafted HTML page. Organizations should prioritize identifying which systems are affected, implementing measures to reduce exposure, applying vendor-provided updates, and verifying that the fixes are successful. Continuous monitoring for related security events is also recommended.

  • Identify Chrome browsers and affected systems.
  • Limit or isolate exposure risks.
  • Apply fixes, verify, and monitor.

Frequently asked questions

What is the software context for CVE-2019-13720, a use-after-free vulnerability in Google Chrome's WebAudio component?

CVE-2019-13720 affects Google Chrome, specifically its WebAudio component. This vulnerability allows remote attackers to potentially exploit heap corruption by directing users to a specially crafted HTML page. The exploitation requires user interaction, meaning an individual must visit a malicious website or click a malicious link. This type of vulnerability can lead to significant security risks, including data compromise and service disruption for affected organizations.

How is the CWE-416 weakness class relevant to CVE-2019-13720, and what is the core weakness?

The core weakness in CVE-2019-13720 is identified as CWE-416, which is a 'Use-After-Free' vulnerability. This occurs when software attempts to access memory after it has been freed, leading to unpredictable behavior and potential corruption. In this case, it allows a remote attacker to trigger heap corruption via a crafted HTML page, potentially leading to system compromise.

What is the trigger path for CVE-2019-13720, and does scope negation apply?

The trigger path for CVE-2019-13720 involves a remote attacker presenting a crafted HTML page to a user. When a user visits this page using a vulnerable version of Google Chrome, the WebAudio component is manipulated, leading to heap corruption. Scope negation does not appear to be a direct factor in the described trigger path, as the vulnerability's impact is within the context of the browser session initiated by the user's interaction with the malicious page.

How relevant is CVE-2019-13720, considering it's listed on the CISA Known Exploited Vulnerabilities catalog?

CVE-2019-13720 is highly relevant as it is listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. This designation indicates that the vulnerability has been actively exploited in the wild, posing a significant threat. The Halo Surface Signal assesses this vulnerability as 'Possible' risk, noting that while it exists in an internet-facing application (web browser), exploitation requires user interaction with a malicious HTML page rather than direct network accessibility.

What are the practical response steps for organizations concerning CVE-2019-13720?

Organizations should prioritize updating Google Chrome to versions 78.0.3904.87 or later to mitigate CVE-2019-13720. It is crucial to identify all affected systems within the environment and implement measures to reduce exposure to malicious websites. Verifying the successful application of updates and maintaining continuous monitoring for related security events are also recommended steps to ensure ongoing protection against this and similar vulnerabilities.

References

Cyber Threat Intelligence (CTI)

Sources: threatActor