CVE-2018-5135 : What You Need to Know
Learn about CVE-2018-5135, a vulnerability in Firefox versions before 59 that allows WebExtensions to inject scripts into unauthorized contexts, potentially leading to security risks. Find mitigation steps and prevention measures here.
In certain situations, WebExtensions in Firefox versions prior to 59 have a vulnerability that allows them to bypass standard constraints and inject scripts into contexts where it is typically prohibited. This can include pages from other WebExtensions or unprivileged 'about:' pages.
Understanding CVE-2018-5135
This CVE relates to a specific vulnerability in Firefox versions before 59 that enables WebExtensions to inject scripts in unauthorized contexts.
What is CVE-2018-5135?
WebExtensions in Firefox versions prior to 59 can exploit the 'browser.tabs.executeScript' function to insert scripts into contexts where it is usually restricted, such as pages from other WebExtensions or unprivileged 'about:' pages.
The Impact of CVE-2018-5135
This vulnerability can be exploited by malicious actors to execute arbitrary scripts in unauthorized contexts, potentially leading to unauthorized access or data manipulation.
Technical Details of CVE-2018-5135
WebExtensions in Firefox versions before 59 can inject scripts into unintended contexts, posing a security risk.
Vulnerability Description
The vulnerability allows WebExtensions to bypass normal restrictions and inject scripts into contexts where it should not be allowed, potentially compromising the security of the browser.
Affected Systems and Versions
- Product: Firefox
- Vendor: Mozilla
- Versions Affected: < 59
Exploitation Mechanism
- WebExtensions exploit the 'browser.tabs.executeScript' function to insert scripts into unauthorized contexts.
Mitigation and Prevention
Taking immediate steps and implementing long-term security practices are crucial to mitigate the risks associated with CVE-2018-5135.
Immediate Steps to Take
- Update Firefox to version 59 or higher to patch the vulnerability.
- Avoid visiting untrusted websites or clicking on suspicious links.
Long-Term Security Practices
- Regularly update browsers and software to the latest versions.
- Implement strong security measures such as using reputable security software and firewalls.
Patching and Updates
- Apply patches and updates provided by Mozilla to address the vulnerability and enhance browser security.