CVE-2021-3243 Cross-site scripting in n/a
An attacker on the same LAN can inject malicious scripts via User-Agent headers in Wfilter ICF logs, leading to system takeover through plugin execution.
- 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
- None listed
What is CVE-2021-3243?
CVE-2021-3243 is a medium-severity cross-site scripting vulnerability in n/a, published on 15 Apr 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
Wfilter ICF 5.0.117 contains a cross-site scripting (XSS) vulnerability. An attacker in the same LAN can craft a packet with a malicious User-Agent header to inject a payload in its logs, where an attacker can take over the system by through its plugin-running function.
Weakness: CWE-79
Which versions are affected by CVE-2021-3243?
It affects 1 product.
Products include Wfiltericf Wfilter Internet Content Filter.
How do I fix CVE-2021-3243?
No fix has been published for CVE-2021-3243 yet. Limit exposure of the affected software until one is available.
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-2021-3243 being exploited?
There is no known exploitation of CVE-2021-3243 in the wild and no public exploit code.
Sources
Also known as GHSA-4g65-6f28-v2h9.