CVE-2017-7765 Security feature bypass in Firefox
Attackers can bypass Windows security warnings for downloaded executables by exploiting a flaw in how Firefox handles long filenames, potentially tricking users into running malicious code.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2017-7765?
CVE-2017-7765 is a high-severity vulnerability in Mozilla Firefox, published on 11 Jun 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
The "Mark of the Web" was not correctly saved on Windows when files with very long names were downloaded from the Internet. Without the Mark of the Web data, the security warning that Windows displays before running executables downloaded from the Internet is not shown. Note: This attack only affects Windows operating systems. Other operating systems are unaffected. This vulnerability affects Firefox < 54, Firefox ESR < 52.2, and Thunderbird < 52.2.
Weakness: CWE-20
Which versions are affected by CVE-2017-7765?
It affects 2 products.
Products include Mozilla Firefox, Mozilla Thunderbird.
How do I fix CVE-2017-7765?
Upgrade to a fixed version.
Is CVE-2017-7765 being exploited?
There is no known exploitation of CVE-2017-7765 in the wild and no public exploit code.
Other vulnerabilities in Mozilla Firefox
Sources
Also known as GHSA-983c-fhxg-vvqr.