CVE-2014-3146 lxml Cross-site Scripting Via Control Characters
Remote attackers can execute arbitrary scripts via control characters in link schemes due to incomplete blacklist filtering in the lxml.html.clean module.
- 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-2014-3146?
CVE-2014-3146 is a medium-severity cross-site scripting vulnerability in n/a, published on 14 May 2014. 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
Incomplete blacklist vulnerability in the lxml.html.clean module in lxml before 3.3.5 allows remote attackers to conduct cross-site scripting (XSS) attacks via control characters in the link scheme to the clean_html function.
Weakness: CWE-79
Which versions are affected by CVE-2014-3146?
3 open source packages ship an affected version, including lxml. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
lxml PyPI | All versions | 3.3.5 |
lxml PyPI | All versions | 3.3.5 |
lxml PyPI | All versions | 3.3.5 |
Products include Lxml Lxml.
How do I fix CVE-2014-3146?
Upgrade lxml to 3.3.5 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-2014-3146 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2014-3146 exists.
Public exploit code: 1 Exploit-DB entry.
Other vulnerabilities in n/a
Sources
Also known as DEBIAN-CVE-2014-3146, DLA-0009-1, DSA-2941-1, GHSA-57qw-cc2g-pv5p, MGASA-2014-0218, PYSEC-2014-9 and 2 more.