CVE-2021-23968 Information disclosure in Firefox
Firefox leaks sensitive redirect URIs in CSP violation reports, allowing attackers to read confidential data from blocked frame navigations.
- 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-2021-23968?
CVE-2021-23968 is a medium-severity vulnerability in Debian Debian Linux, published on 26 Feb 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
If Content Security Policy blocked frame navigation, the full destination of a redirect served in the frame was reported in the violation report; as opposed to the original frame URI. This could be used to leak sensitive information contained in such URIs. This vulnerability affects Firefox < 86, Thunderbird < 78.8, and Firefox ESR < 78.8.
Weakness: CWE-209
Which versions are affected by CVE-2021-23968?
It affects 4 products.
Products include Debian Debian Linux, Mozilla Firefox, Mozilla Firefox Esr, Mozilla Thunderbird.
How do I fix CVE-2021-23968?
Upgrade to a fixed version.
Is CVE-2021-23968 being exploited?
There is no known exploitation of CVE-2021-23968 in the wild and no public exploit code.
Other vulnerabilities in Debian Debian Linux
Sources
Also known as DEBIAN-CVE-2021-23968, GHSA-94jc-v9rf-w32j, UBUNTU-CVE-2021-23968.