CVE-2022-23514 Inefficient Regular Expression Complexity in Loofah
Attackers can cause denial of service via CPU exhaustion by exploiting inefficient regular expressions in the Loofah library during SVG sanitization.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2022-23514?
CVE-2022-23514 is a high-severity denial of service vulnerability in flavorjones loofah, published on 14 Dec 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Loofah is a general library for manipulating and transforming HTML/XML documents and fragments, built on top of Nokogiri. Loofah < 2.19.1 contains an inefficient regular expression that is susceptible to excessive backtracking when attempting to sanitize certain SVG attributes. This may lead to a denial of service through CPU resource consumption. This issue is patched in version 2.19.1.
Weakness: CWE-1333
Which versions are affected by CVE-2022-23514?
2 open source packages ship an affected version, including loofah. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
loofah RubyGems | All versions | 2.19.1 |
loofah RubyGems | All versions | 2.19.1 |
Products include Loofah Project Loofah.
How do I fix CVE-2022-23514?
Upgrade loofah to 2.19.1 or later.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2022-23514 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2022-23514 exists.
Other vulnerabilities in flavorjones loofah
Sources
Also known as DEBIAN-CVE-2022-23514, GHSA-486f-hjj9-9vhh, UBUNTU-CVE-2022-23514.