CVE-2021-41817 Regular expression denial of service vulnerability (ReDoS) in date
Attackers can cause denial of service in Ruby applications using the date gem by submitting long strings to Date.parse.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2021-41817?
CVE-2021-41817 is a high-severity denial of service vulnerability in Debian Debian Linux, published on 1 Jan 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Date.parse in the date gem through 3.2.0 for Ruby allows ReDoS (regular expression Denial of Service) via a long string. The fixed versions are 3.2.1, 3.1.2, 3.0.2, and 2.0.1.
Weakness: CWE-1333
Which versions are affected by CVE-2021-41817?
10 open source packages ship an affected version, including date, ruby and ruby-min. It affects 9 products.
| Package | Affected | Fixed in |
|---|---|---|
date RubyGems | All versions | 2.0.1 |
date RubyGems | All versions | 2.0.1 |
date RubyGems | From 3.0.0 | 3.0.2 |
date RubyGems | From 3.0.0 | 3.0.2 |
date RubyGems | From 3.1.0 | 3.1.2 |
date RubyGems | From 3.1.0 | 3.1.2 |
4 more packages
date RubyGems | From 3.2.0 | 3.2.1 |
date RubyGems | From 3.2.0 | 3.2.1 |
ruby Bitnami | From 2.6.0 | 2.6.9, 2.7.5, 3.0.3 |
ruby-min Bitnami | From 2.6.0 | 2.6.9, 2.7.5, 3.0.3 |
Products include Debian Debian Linux, Fedoraproject Fedora, Opensuse Factory, Opensuse Leap, Redhat Enterprise Linux, Redhat Software Collections and 3 more.
How do I fix CVE-2021-41817?
Upgrade date to a fixed version for your release line: 2.0.1, 3.0.2, 3.1.2 or 3.2.1.
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-2021-41817 being exploited?
There is no known exploitation of CVE-2021-41817 in the wild and no public exploit code.
Other vulnerabilities in Debian Debian Linux
Sources
Also known as ALPINE-CVE-2021-41817, AZL-7110, BIT-ruby-2021-41817, BIT-ruby-min-2021-41817, CLEANSTART-2026-KK38106, DEBIAN-CVE-2021-41817 and 4 more.