CVE-2020-6799 : Exploit Details and Defense Strategies
Learn about CVE-2020-6799, a Mozilla Firefox vulnerability allowing arbitrary code execution when opening PDF links. Find mitigation steps and long-term security practices here.
A vulnerability in Mozilla Firefox could allow for arbitrary code execution when opening PDF links from other applications.
Understanding CVE-2020-6799
This CVE involves a security issue in Firefox that could lead to the execution of arbitrary code under specific conditions.
What is CVE-2020-6799?
Command line arguments injected during Firefox invocation could be exploited when Firefox is configured as the default handler for certain file types, potentially allowing the retrieval and execution of files.
The Impact of CVE-2020-6799
The vulnerability could result in arbitrary code execution when opening PDF links from other applications, specifically when Firefox is set as the default PDF reader.
Technical Details of CVE-2020-6799
This section provides more technical insights into the vulnerability.
Vulnerability Description
The issue arises from the injection of command line arguments during Firefox invocation, leading to potential code execution.
Affected Systems and Versions
- Affected Product: Firefox
- Vendor: Mozilla
- Versions: Firefox < 73, Firefox < ESR68.5
Exploitation Mechanism
- Firefox configured as default handler for unsupported file types
- File downloaded and opened in a third-party app with insufficient URL data sanitization
- Clicking a link in the third-party app could retrieve and execute files
- Vulnerability only affects Windows OS when Firefox is default handler for non-default file types
Mitigation and Prevention
Protecting systems from CVE-2020-6799 requires immediate actions and long-term security practices.
Immediate Steps to Take
- Update Firefox to version 73 or ESR68.5 to mitigate the vulnerability
- Avoid opening PDF links from other applications until the browser is patched
Long-Term Security Practices
- Regularly update Firefox to the latest version to address security flaws
- Be cautious when configuring default file handlers in browsers
Patching and Updates
- Apply security patches provided by Mozilla promptly to address CVE-2020-6799