CVE-2019-11934 : Exploit Details and Defense Strategies

An out-of-bounds read vulnerability in AsyncSSLSocket in Facebook's Folly library versions prior to v2019.11.04.00.

Understanding CVE-2019-11934

This CVE involves mishandling of close_notify alerts leading to an out-of-bounds read vulnerability in AsyncSSLSocket.

What is CVE-2019-11934?

An out-of-bounds read vulnerability in AsyncSSLSocket due to mishandling of close_notify alerts.
Impacting Facebook's Folly library versions earlier than v2019.11.04.00.

The Impact of CVE-2019-11934

Attackers can exploit this vulnerability to read sensitive information from memory.
Could potentially lead to unauthorized access or information disclosure.

Technical Details of CVE-2019-11934

This section provides technical insights into the vulnerability.

Vulnerability Description

Improper handling of close_notify alerts results in an out-of-bounds read in AsyncSSLSocket.

Affected Systems and Versions

Product: Folly
Vendor: Facebook
Affected Versions: v2019.11.04.00 and earlier

Exploitation Mechanism

Attackers can trigger the vulnerability by manipulating close_notify alerts, leading to out-of-bounds memory access.

Mitigation and Prevention

Protecting systems from CVE-2019-11934 requires immediate actions and long-term security measures.

Immediate Steps to Take

Update Folly library to version v2019.11.04.00 or later to mitigate the vulnerability.
Monitor network traffic for any suspicious activities indicating exploitation.

Long-Term Security Practices

Regularly update software and libraries to patch known vulnerabilities.
Implement secure coding practices to prevent similar memory-related issues.

Patching and Updates

Stay informed about security advisories from vendors like Facebook to apply relevant patches promptly.