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Ubuntu Security Notice USN-5254-1
January 27, 2022

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

- Ubuntu 18.04 LTS
- Ubuntu 16.04 ESM
- Ubuntu 14.04 ESM

Summary:

Several security issues were fixed in shadow.

Software Description:
- shadow: system login tools

Details:

It was discovered that shadow incorrectly handled certain inputs.
An attacker could possibly use this issue to cause a crash or
expose sensitive information. This issue only affected
Ubuntu 14.04 ESM and Ubuntu 16.04 ESM. (CVE-2017-12424)

It was discovered that shadow incorrectly handled certain inputs.
An attacker could possibly use this issue to expose sensitive information.
(CVE-2018-7169)

Update instructions:

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

Ubuntu 18.04 LTS:
  login                           1:4.5-1ubuntu2.2
  passwd                          1:4.5-1ubuntu2.2
  uidmap                          1:4.5-1ubuntu2.2

Ubuntu 16.04 ESM:
  login                           1:4.2-3.1ubuntu5.5+esm1
  passwd                          1:4.2-3.1ubuntu5.5+esm1
  uidmap                          1:4.2-3.1ubuntu5.5+esm1

Ubuntu 14.04 ESM:
  login                           1:4.1.5.1-1ubuntu9.5+esm1
  passwd                          1:4.1.5.1-1ubuntu9.5+esm1
  uidmap                          1:4.1.5.1-1ubuntu9.5+esm1

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

References:
  https://ubuntu.com/security/notices/USN-5254-1
  CVE-2017-12424, CVE-2018-7169

Package Information:
  https://launchpad.net/ubuntu/+source/shadow/1:4.5-1ubuntu2.2