1. Ubuntu Security Notices
  2. USN-5910-1

USN-5910-1: Rack vulnerabilities

Publication date

2 March 2023

Overview

Several security issues were fixed in Rack.

Releases

Packages

  • ruby-rack - modular Ruby webserver interface

Details

It was discovered that Rack did not properly structure regular expressions
in some of its parsing components, which could result in uncontrolled
resource consumption if an application using Rack received specially
crafted input. A remote attacker could possibly use this issue to cause a
denial of service. (CVE-2022-44570, CVE-2022-44571)

It was discovered that Rack did not properly structure regular expressions
in its multipart parsing component, which could result in uncontrolled
resource consumption if an application using Rack to parse multipart posts
received specially crafted input. A remote attacker could possibly use
this issue to cause a denial of service. This issue was only fixed in
Ubuntu 20.04 ESM and Ubuntu 22.04 ESM. (CVE-2022-44572)

It was discovered that Rack did not properly structure regular expressions
in some of its parsing components, which could result in uncontrolled
resource consumption if an application using Rack received specially
crafted input. A remote attacker could possibly use this issue to cause a
denial of service. (CVE-2022-44570, CVE-2022-44571)

It was discovered that Rack did not properly structure regular expressions
in its multipart parsing component, which could result in uncontrolled
resource consumption if an application using Rack to parse multipart posts
received specially crafted input. A remote attacker could possibly use
this issue to cause a denial of service. This issue was only fixed in
Ubuntu 20.04 ESM and Ubuntu 22.04 ESM. (CVE-2022-44572)

Update instructions

After a standard system update you need to restart any applications using Rack to make all the necessary changes.

Learn more about how to get the fixes.

The problem can be corrected by updating your system to the following package versions:

Ubuntu Release Package Version
22.04 jammy ruby-rack –  2.1.4-5ubuntu1+esm3  
20.04 focal ruby-rack –  2.0.7-2ubuntu0.1+esm3  
18.04 bionic ruby-rack –  1.6.4-4ubuntu0.2+esm4  
16.04 xenial ruby-rack –  1.6.4-3ubuntu0.2+esm4  
14.04 trusty ruby-rack –  1.5.2-3+deb8u3ubuntu1~esm6  

Reduce your security exposure

Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines.

Get Ubuntu Pro

References

Have additional questions?

Talk to a member of the team ›