CVE-2013-4939 Cross-Site Scripting in yui
Remote attackers can inject arbitrary web script or HTML via crafted URLs in the YUI IO Utility component, affecting applications like Moodle.
- 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-2013-4939?
CVE-2013-4939 is a medium-severity cross-site scripting vulnerability in Moodle Moodle, published on 26 Jul 2013. 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
Cross-site scripting (XSS) vulnerability in io.swf in the IO Utility component in Yahoo! YUI 3.0.0 through 3.9.1, as used in Moodle through 2.1.10, 2.2.x before 2.2.11, 2.3.x before 2.3.8, 2.4.x before 2.4.5, 2.5.x before 2.5.1, and other products, allows remote attackers to inject arbitrary web script or HTML via a crafted string in a URL.
Weakness: CWE-79
Which versions are affected by CVE-2013-4939?
2 open source packages ship an affected version, including yui. It affects 2 products.
| Package | Affected | Fixed in |
|---|---|---|
yui npm | All versions | 3.10.3 |
yui npm | All versions | 3.10.3 |
Products include Moodle Moodle, Yahoo Yui.
How do I fix CVE-2013-4939?
Upgrade yui to 3.10.3 or later.
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-2013-4939 being exploited?
There is no known exploitation of CVE-2013-4939 in the wild and no public exploit code.
Other vulnerabilities in Moodle Moodle
- CVE-2006-4935 File upload in n/a
- CVE-2006-4936 Moodle does not properly validate module instance id
- CVE-2004-2233 Unknown "front page vulnerability with Moodle servers" for Moodle before 1.3.2 has unknown impact and attack vectors.
- CVE-2004-2235 Cross-site scripting in n/a
- CVE-2004-2236 Other in n/a
Sources
Also known as GHSA-mj87-8xf8-fp4w.