CVE-2024-47889 Action Mailer has possible ReDoS vulnerability in block_format
Attackers can cause denial of service in Rails applications by sending crafted text to the Action Mailer block_format helper.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2024-47889?
CVE-2024-47889 is a medium-severity denial of service vulnerability in rails, published on 16 Oct 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Action Mailer is a framework for designing email service layers. Starting in version 3.0.0 and prior to versions 6.1.7.9, 7.0.8.5, 7.1.4.1, and 7.2.1.1, there is a possible ReDoS vulnerability in the block_format helper in Action Mailer. Carefully crafted text can cause the block_format helper to take an unexpected amount of time, possibly resulting in a DoS vulnerability. All users running an affected release should either upgrade to versions 6.1.7.9, 7.0.8.5, 7.1.4.1, or 7.2.1.1 or apply the relevant patch immediately. As a workaround, users can avoid calling the `block_format` helper or upgrade to Ruby 3.2. Ruby 3.2 has mitigations for this problem, so Rails applications using Ruby 3.2 or newer are unaffected. Rails 8.0.0.beta1 requires Ruby 3.2 or greater so is unaffected.
Weakness: CWE-1333
Which versions are affected by CVE-2024-47889?
9 open source packages ship an affected version, including rails and actionmailer.
| Package | Affected | Fixed in |
|---|---|---|
rails Bitnami | From 3.0.0 | 6.1.8, 7.0.9, 7.1.4, 7.2.2 |
actionmailer RubyGems | From 3.0.0 | 6.1.7.9 |
actionmailer RubyGems | From 3.0.0 | 6.1.7.9 |
actionmailer RubyGems | From 7.0.0 | 7.0.8.5 |
actionmailer RubyGems | From 7.0.0 | 7.0.8.5 |
actionmailer RubyGems | From 7.1.0 | 7.1.4.1 |
3 more packages
actionmailer RubyGems | From 7.1.0 | 7.1.4.1 |
actionmailer RubyGems | From 7.2.0 | 7.2.1.1 |
actionmailer RubyGems | From 7.2.0 | 7.2.1.1 |
Linux distribution packages (6)
rubygem-actionmailer-5_1 SUSE:Linux Enterprise High Availability Extension 15 SP2 | All versions | 5.1.4-150000.3.3.1 |
rubygem-actionmailer-5_1 SUSE:Linux Enterprise High Availability Extension 15 SP3 | All versions | 5.1.4-150000.3.3.1 |
rubygem-actionmailer-5_1 SUSE:Linux Enterprise High Availability Extension 15 SP4 | All versions | 5.1.4-150000.3.3.1 |
rubygem-actionmailer-5_1 SUSE:Linux Enterprise High Availability Extension 15 SP5 | All versions | 5.1.4-150000.3.3.1 |
rubygem-actionmailer-7.0 openSUSE:Tumbleweed | All versions | 7.0.8.6-1.1 |
rubygem-actionmailer-7.0 openSUSE:Tumbleweed | All versions | 7.0.8.6-1.3 |
How do I fix CVE-2024-47889?
Upgrade rails to a fixed version for your release line: 6.1.8, 7.0.9, 7.1.4 or 7.2.2.
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-2024-47889 being exploited?
There is no known exploitation of CVE-2024-47889 in the wild and no public exploit code.
Sources
Also known as BIT-rails-2024-47889, DEBIAN-CVE-2024-47889, GHSA-h47h-mwp9-c6q6, OESA-2024-2383, SUSE-SU-2024:3878-1, UBUNTU-CVE-2024-47889 and 2 more.