1. Ubuntu Security Notices
  2. USN-5896-1

USN-5896-1: Rack vulnerabilities

Publication date

27 February 2023

Overview

Several security issues were fixed in Rack.

Releases

Packages

  • ruby-rack - modular Ruby webserver interface

Details

It was discovered that Rack was not properly parsing data when processing
multipart POST requests. If a user or automated system were tricked into
sending a specially crafted multipart POST request to an application using
Rack, a remote attacker could possibly use this issue to cause a denial of
service. (CVE-2022-30122)

It was discovered that Rack was not properly escaping untrusted data when
performing logging operations, which could cause shell escaped sequences
to be written to a terminal. If a user or automated system were tricked
into sending a specially crafted request to an application using Rack, a
remote attacker could possibly use this issue to execute arbitrary code in
the machine running the application. (CVE-2022-30123)

It was discovered that Rack was not properly parsing data when processing
multipart POST requests. If a user or automated system were tricked into
sending a specially crafted multipart POST request to an application using
Rack, a remote attacker could possibly use this issue to cause a denial of
service. (CVE-2022-30122)

It was discovered that Rack was not properly escaping untrusted data when
performing logging operations, which could cause shell escaped sequences
to be written to a terminal. If a user or automated system were tricked
into sending a specially crafted request to an application using Rack, a
remote attacker could possibly use this issue to execute arbitrary code in
the machine running the application. (CVE-2022-30123)

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+esm2  
20.04 focal ruby-rack –  2.0.7-2ubuntu0.1+esm2  
18.04 bionic ruby-rack –  1.6.4-4ubuntu0.2+esm2  

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References

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