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Ubuntu Security Notice USN-5806-1

Ubuntu Security Notice USN-5806-1
Posted Jan 18, 2023
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 5806-1 - Hiroshi Tokumaru discovered that Ruby did not properly handle certain user input for applications which generate HTTP responses using cgi gem. An attacker could possibly use this issue to maliciously modify the response a user would receive from a vulnerable application.

tags | advisory, web, cgi, ruby
systems | linux, ubuntu
advisories | CVE-2021-33621
SHA-256 | 75ea48c38a96b7594dbd0877d422b431f6c885a45730d787e0fa46952d38d26c

Ubuntu Security Notice USN-5806-1

Change Mirror Download
==========================================================================

Ubuntu Security Notice USN-5806-1
January 17, 2023

ruby2.3 vulnerability
==========================================================================

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

- Ubuntu 16.04 ESM

Summary:

Ruby could allow for internet traffic to be modified if
a vulnerable application processed malicious user input.

Software Description:
- ruby2.3: Object-oriented scripting language

Details:

Hiroshi Tokumaru discovered that Ruby did not properly handle certain
user input for applications which generate HTTP responses using cgi gem.
An attacker could possibly use this issue to maliciously modify the
response a user would receive from a vulnerable application.

Update instructions:

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

Ubuntu 16.04 ESM:
libruby2.3 2.3.1-2~ubuntu16.04.16+esm4
ruby2.3 2.3.1-2~ubuntu16.04.16+esm4

In general, a standard system update will make all the necessary changes.

References:
https://ubuntu.com/security/notices/USN-5806-1
<https://ubuntu.com/security/notices/USN-5806-1>
CVE-2021-33621

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