CVE-2020-15680 Information disclosure in Firefox
An attacker can determine if specific external protocol handlers are registered in Firefox by analyzing broken image sizes, leaking local system configuration details.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2020-15680?
CVE-2020-15680 is a medium-severity vulnerability in Mozilla Firefox, published on 22 Oct 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
If a valid external protocol handler was referenced in an image tag, the resulting broken image size could be distinguished from a broken image size of a non-existent protocol handler. This allowed an attacker to successfully probe whether an external protocol handler was registered. This vulnerability affects Firefox < 82.
Which versions are affected by CVE-2020-15680?
It affects 1 product.
Products include Mozilla Firefox.
How do I fix CVE-2020-15680?
Upgrade to a fixed version.
Is CVE-2020-15680 being exploited?
There is no known exploitation of CVE-2020-15680 in the wild and no public exploit code.
Other vulnerabilities in Mozilla Firefox
Sources
Also known as GHSA-rcq3-vgfc-jm9v, UBUNTU-CVE-2020-15680.