CVE-2020-12399 Information disclosure in Firefox
Timing side-channel in NSS DSA signatures allows attackers to potentially leak private keys from Firefox and Thunderbird users.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2020-12399?
CVE-2020-12399 is a medium-severity vulnerability in Debian Debian Linux, published on 9 Jul 2020. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
NSS has shown timing differences when performing DSA signatures, which was exploitable and could eventually leak private keys. This vulnerability affects Thunderbird < 68.9.0, Firefox < 77, and Firefox ESR < 68.9.
Weakness: CWE-203
Which versions are affected by CVE-2020-12399?
It affects 4 products.
Products include Debian Debian Linux, Mozilla Firefox, Mozilla Firefox Esr, Mozilla Thunderbird.
How do I fix CVE-2020-12399?
Upgrade to a fixed version.
Is CVE-2020-12399 being exploited?
There is no known exploitation of CVE-2020-12399 in the wild and no public exploit code.
Other vulnerabilities in Debian Debian Linux
Sources
Also known as DEBIAN-CVE-2020-12399, GHSA-fq62-4j88-qq7x, UBUNTU-CVE-2020-12399, USN-4397-2.