CVE-2009-5017 Cross-site scripting in n/a
Remote attackers can bypass XSS protection in Mozilla Firefox via crafted overlong UTF-8 strings, requiring user interaction to view the malicious content.
- 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-2009-5017?
CVE-2009-5017 is a medium-severity cross-site scripting vulnerability in Mozilla Firefox, published on 12 Nov 2010. 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
Mozilla Firefox before 3.6 Beta 3 does not properly handle overlong UTF-8 encoding, which makes it easier for remote attackers to bypass cross-site scripting (XSS) protection mechanisms via a crafted string, a different vulnerability than CVE-2010-1210.
Weakness: CWE-79
Which versions are affected by CVE-2009-5017?
It affects 1 product.
Products include Mozilla Firefox.
How do I fix CVE-2009-5017?
Upgrade to a fixed version.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2009-5017 being exploited?
There is no known exploitation of CVE-2009-5017 in the wild and no public exploit code.
Other vulnerabilities in Mozilla Firefox
Sources
Also known as GHSA-p83q-cg3p-77f9.