CVE-2018-5163 : Security Advisory and Response

A vulnerability in Firefox versions prior to 60 could allow an attacker to execute malicious JavaScript code with elevated privileges by manipulating the JavaScript Start-up Bytecode Cache (JSBC).

Understanding CVE-2018-5163

This CVE involves a security flaw in Firefox that enables an attacker to bypass content process restrictions by replacing cached data in the JSBC with malicious JavaScript code.

What is CVE-2018-5163?

If a malicious actor exploits another vulnerability to take control of a content process, they can substitute legitimate data in the JSBC with malicious code. When the parent process executes this altered code, the script runs with elevated privileges, evading content process limitations.

The Impact of CVE-2018-5163

The vulnerability allows an attacker to execute arbitrary JavaScript code with the privileges of the parent process, potentially leading to unauthorized access and data manipulation.

Technical Details of CVE-2018-5163

This section provides detailed technical insights into the vulnerability.

Vulnerability Description

The flaw in Firefox versions prior to 60 enables attackers to replace cached data in the JSBC with malicious JavaScript code, allowing them to execute code with elevated privileges.

Affected Systems and Versions

Product: Firefox
Vendor: Mozilla
Versions Affected: < 60

Exploitation Mechanism

Attackers exploit an additional vulnerability to gain control over a content process, enabling them to manipulate the JSBC and execute malicious JavaScript code with elevated privileges.

Mitigation and Prevention

Protecting systems from CVE-2018-5163 requires immediate actions and long-term security practices.

Immediate Steps to Take

Update Firefox to version 60 or later to mitigate the vulnerability.
Monitor for any suspicious activities on the browser.

Long-Term Security Practices

Regularly update browsers and software to patch known vulnerabilities.
Implement security measures to prevent unauthorized access to critical processes.
Educate users on safe browsing practices to minimize the risk of exploitation.

Patching and Updates

Mozilla has released patches addressing CVE-2018-5163. Ensure all systems are updated with the latest Firefox version to prevent exploitation.