CVE-2021-24002 Command injection in Firefox
An attacker can inject arbitrary commands to an FTP server by tricking a user into clicking a malicious URL with encoded newlines in Firefox or Thunderbird.
- 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-2021-24002?
CVE-2021-24002 is a high-severity command injection vulnerability in Mozilla Firefox, published on 24 Jun 2021. 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
When a user clicked on an FTP URL containing encoded newline characters (%0A and %0D), the newlines would have been interpreted as such and allowed arbitrary commands to be sent to the FTP server. This vulnerability affects Firefox ESR < 78.10, Thunderbird < 78.10, and Firefox < 88.
Weakness: CWE-74
Which versions are affected by CVE-2021-24002?
It affects 3 products.
Products include Mozilla Firefox, Mozilla Firefox Esr, Mozilla Thunderbird.
How do I fix CVE-2021-24002?
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-2021-24002 being exploited?
There is no known exploitation of CVE-2021-24002 in the wild and no public exploit code.
Other vulnerabilities in Mozilla Firefox
Sources
Also known as DEBIAN-CVE-2021-24002, GHSA-jvwq-53jx-c5f6, UBUNTU-CVE-2021-24002.