CVE-2009-4142 Cross-site scripting in n/a
Remote attackers can execute cross-site scripting attacks by exploiting improper handling of invalid character sequences in the PHP htmlspecialchars function.
- 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-2009-4142?
CVE-2009-4142 is a medium-severity cross-site scripting vulnerability in Php Php, published on 21 Dec 2009. 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
The htmlspecialchars function in PHP before 5.2.12 does not properly handle (1) overlong UTF-8 sequences, (2) invalid Shift_JIS sequences, and (3) invalid EUC-JP sequences, which allows remote attackers to conduct cross-site scripting (XSS) attacks by placing a crafted byte sequence before a special character.
Weakness: CWE-79
Which versions are affected by CVE-2009-4142?
It affects 1 product.
Products include Php Php.
How do I fix CVE-2009-4142?
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-2009-4142 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2009-4142 exists.
Public exploit code: 2 Exploit-DB entries.
Other vulnerabilities in Php Php
Sources
Also known as GHSA-q555-wmm9-43g3.