CVE-2019-11694 : Exploit Details and Defense Strategies

A vulnerability exists in the Windows sandbox where an uninitialized value in memory can be leaked to a renderer from a broker when making a call to access an otherwise unavailable file. This results in the potential leaking of information stored at that memory location. Note: this issue only occurs on Windows. Other operating systems are unaffected. This vulnerability affects Thunderbird versions earlier than 60.7, Firefox versions earlier than 67, and Firefox ESR versions earlier than 60.7.

Understanding CVE-2019-11694

This CVE identifies a vulnerability in the Windows sandbox that could lead to the exposure of uninitialized memory values.

What is CVE-2019-11694?

The Windows sandbox vulnerability allows uninitialized memory values to be unintentionally disclosed to a renderer from a broker, potentially exposing sensitive information stored at that memory location.

The Impact of CVE-2019-11694

The vulnerability could result in the exposure of sensitive information stored in uninitialized memory locations, posing a risk to user data confidentiality.

Technical Details of CVE-2019-11694

The technical aspects of the vulnerability are as follows:

Vulnerability Description

Uninitialized memory values can be leaked to a renderer from a broker in the Windows sandbox.

Affected Systems and Versions

Thunderbird versions earlier than 60.7
Firefox versions earlier than 67
Firefox ESR versions earlier than 60.7

Exploitation Mechanism

When attempting to access an inaccessible file, uninitialized memory values can be unintentionally disclosed to a renderer from a broker.

Mitigation and Prevention

Taking immediate steps and implementing long-term security practices are crucial to mitigating the risks associated with CVE-2019-11694.

Immediate Steps to Take

Update affected software to versions 60.7 for Thunderbird, 67 for Firefox, and 60.7 for Firefox ESR.
Monitor official security advisories for patches and updates.

Long-Term Security Practices

Regularly update software to the latest versions to address security vulnerabilities.
Implement secure coding practices to prevent memory leaks and unauthorized data disclosure.

Patching and Updates

Apply patches provided by Mozilla for Thunderbird, Firefox, and Firefox ESR to address the vulnerability.