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Ubuntu Security Notice USN-5020-1

Ubuntu Security Notice USN-5020-1
Posted Jul 21, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 5020-1 - It was discovered that Ruby incorrectly handled certain inputs. An attacker could possibly use this issue to execute arbitrary code. It was discovered that Ruby incorrectly handled certain inputs. An attacker could possibly use this issue to conduct port scans and service banner extractions. This issue only affected Ubuntu 18.04 LTS, Ubuntu 20.04 LTS, Ubuntu 20.10, and Ubuntu 21.04. Various other issues were also addressed.

tags | advisory, arbitrary, ruby
systems | linux, ubuntu
advisories | CVE-2021-31799, CVE-2021-31810, CVE-2021-32066
MD5 | b2e949441f11b0559bbbb899cab3d9d3

Ubuntu Security Notice USN-5020-1

Change Mirror Download
=========================================================================
Ubuntu Security Notice USN-5020-1
July 21, 2021

ruby2.3, ruby2.5, ruby2.7 vulnerabilities
=========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 21.04
- Ubuntu 20.10
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 ESM

Summary:

Several security issues were fixed in Ruby.

Software Description:
- ruby2.7: Object-oriented scripting language
- ruby2.5: Object-oriented scripting language
- ruby2.3: Object-oriented scripting language

Details:

It was discovered that Ruby incorrectly handled certain inputs.
An attacker could possibly use this issue to execute arbitrary code.
(CVE-2021-31799)

It was discovered that Ruby incorrectly handled certain inputs.
An attacker could possibly use this issue to conduct
port scans and service banner extractions. This issue only affected
Ubuntu 18.04 LTS, Ubuntu 20.04 LTS, Ubuntu 20.10, and Ubuntu 21.04. (CVE-2021-31810)

It was discovered that Ruby incorrectly handled certain inputs.
An attacker could possibly use this issue to perform
man-in-the-middle attackers to bypass the TLS protection.
(CVE-2021-32066)

Update instructions:

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

Ubuntu 21.04:
libruby2.7 2.7.2-4ubuntu1.2
ruby2.7 2.7.2-4ubuntu1.2

Ubuntu 20.10:
libruby2.7 2.7.1-3ubuntu1.4
ruby2.7 2.7.1-3ubuntu1.4

Ubuntu 20.04 LTS:
libruby2.7 2.7.0-5ubuntu1.5
ruby2.7 2.7.0-5ubuntu1.5

Ubuntu 18.04 LTS:
libruby2.5 2.5.1-1ubuntu1.10
ruby2.5 2.5.1-1ubuntu1.10

Ubuntu 16.04 ESM:
libruby2.3 2.3.1-2~ubuntu16.04.16+esm1
ruby2.3 2.3.1-2~ubuntu16.04.16+esm1

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

References:
https://ubuntu.com/security/notices/USN-5020-1
CVE-2021-31799, CVE-2021-31810, CVE-2021-32066

Package Information:
https://launchpad.net/ubuntu/+source/ruby2.7/2.7.2-4ubuntu1.2
https://launchpad.net/ubuntu/+source/ruby2.7/2.7.1-3ubuntu1.4
https://launchpad.net/ubuntu/+source/ruby2.7/2.7.0-5ubuntu1.5
https://launchpad.net/ubuntu/+source/ruby2.5/2.5.1-1ubuntu1.10
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