1. Ubuntu Security Notices
  2. USN-5253-1

USN-5253-1: Rack vulnerabilities

Publication date

13 December 2022

Overview

Several security issues were fixed in Rack.

Releases

Packages

  • ruby-rack - modular Ruby webserver interface

Details

It was discovered that Rack insecurely handled session ids. An
unauthenticated remote attacker could possibly use this issue to perform
a timing attack and hijack sessions. (CVE-2019-16782)

It was discovered that Rack was incorrectly handling cookies during
parsing, not validating them or performing the necessary integrity checks.
An attacker could possibly use this issue to overwrite existing cookie
data and gain control over a remote system’s behaviour. This issue only
affected Ubuntu 14.04 ESM. (CVE-2020-8184)

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. This issue was only fixed in Ubuntu...

It was discovered that Rack insecurely handled session ids. An
unauthenticated remote attacker could possibly use this issue to perform
a timing attack and hijack sessions. (CVE-2019-16782)

It was discovered that Rack was incorrectly handling cookies during
parsing, not validating them or performing the necessary integrity checks.
An attacker could possibly use this issue to overwrite existing cookie
data and gain control over a remote system’s behaviour. This issue only
affected Ubuntu 14.04 ESM. (CVE-2020-8184)

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. This issue was only fixed in Ubuntu 14.04 ESM and Ubuntu 16.04
ESM. (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. This issue was only fixed in Ubuntu
14.04 ESM and Ubuntu 16.04 ESM. (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
20.04 focal ruby-rack –  2.0.7-2ubuntu0.1+esm1  
18.04 bionic ruby-rack –  1.6.4-4ubuntu0.2+esm1  
16.04 xenial ruby-rack –  1.6.4-3ubuntu0.2+esm2  
14.04 trusty ruby-rack –  1.5.2-3+deb8u3ubuntu1~esm4  

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References

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