==========================================================================
Ubuntu Security Notice USN-5910-1
March 02, 2023

ruby-rack vulnerabilities
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 ESM
- Ubuntu 14.04 ESM

Summary:

Several security issues were fixed in Rack.

Software Description:
- 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)

Update instructions:

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

Ubuntu 22.04 LTS:
   ruby-rack                       2.1.4-5ubuntu1+esm3

Ubuntu 20.04 LTS:
   ruby-rack                       2.0.7-2ubuntu0.1+esm3

Ubuntu 18.04 LTS:
   ruby-rack                       1.6.4-4ubuntu0.2+esm4

Ubuntu 16.04 ESM:
   ruby-rack                       1.6.4-3ubuntu0.2+esm4

Ubuntu 14.04 ESM:
   ruby-rack                       1.5.2-3+deb8u3ubuntu1~esm6

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

References:
   https://ubuntu.com/security/notices/USN-5910-1
   CVE-2022-44570, CVE-2022-44571, CVE-2022-44572

Package Information: