CVE-2020-6799 Command injection in Firefox
Attackers can execute arbitrary code via command line injection when Firefox is the default handler for specific file types on Windows.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2020-6799?
CVE-2020-6799 is a high-severity command injection vulnerability in Mozilla Firefox, published on 2 Mar 2020. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
Command line arguments could have been injected during Firefox invocation as a shell handler for certain unsupported file types. This required Firefox to be configured as the default handler for a given file type and for a file downloaded to be opened in a third party application that insufficiently sanitized URL data. In that situation, clicking a link in the third party application could have been used to retrieve and execute files whose location was supplied through command line arguments. Note: This issue only affects Windows operating systems and when Firefox is configured as the default handler for non-default filetypes. Other operating systems are unaffected. This vulnerability affects Firefox < 73 and Firefox < ESR68.5.
Weakness: CWE-88
Which versions are affected by CVE-2020-6799?
It affects 2 products.
Products include Mozilla Firefox, Mozilla Firefox Esr.
How do I fix CVE-2020-6799?
Upgrade to a fixed version.
Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.
Is CVE-2020-6799 being exploited?
There is no known exploitation of CVE-2020-6799 in the wild and no public exploit code.
Other vulnerabilities in Mozilla Firefox
Sources
Also known as GHSA-8h3q-5823-cjpv.