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From: Rodrigo Figueiredo Zaiden <rodrigo.zaiden@canonical.com>
Reply-To: security@ubuntu.com
To: ubuntu-security-announce@lists.ubuntu.com
Message-ID: <24a2b7dd-bf5e-5934-edc0-5c96aba799cb@canonical.com>
Subject: [USN-5395-2] networkd-dispatcher regression

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==========================================================================
Ubuntu Security Notice USN-5395-2
May 04, 2022

networkd-dispatcher regression
==========================================================================

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

- Ubuntu 22.04 LTS
- Ubuntu 21.10
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS

Summary:

USN-5395-1 introduced a regression in networkd-dispatcher.

Software Description:
- networkd-dispatcher: Dispatcher service for systemd-networkd 
connection status changes

Details:

USN-5395-1 fixed vulnerabilities in networkd-dispatcher. Unfortunately
that update was incomplete and could introduce a regression. This update
fixes the problem.

We apologize for the inconvenience.

Original advisory details:

  It was discovered that networkd-dispatcher incorrectly handled internal
  scripts. A local attacker could possibly use this issue to cause a race
  condition, escalate privileges and execute arbitrary code.
  (CVE-2022-29799, CVE-2022-29800)

Update instructions:

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

Ubuntu 22.04 LTS:
   networkd-dispatcher             2.1-2ubuntu0.22.04.2

Ubuntu 21.10:
   networkd-dispatcher             2.1-2ubuntu0.21.10.2

Ubuntu 20.04 LTS:
   networkd-dispatcher             2.1-2~ubuntu20.04.3

Ubuntu 18.04 LTS:
   networkd-dispatcher             1.7-0ubuntu3.5

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

References:
   https://ubuntu.com/security/notices/USN-5395-2
   https://ubuntu.com/security/notices/USN-5395-1
   https://launchpad.net/bugs/1971550

Package Information:
 
https://launchpad.net/ubuntu/+source/networkd-dispatcher/2.1-2ubuntu0.22.04.2
 
https://launchpad.net/ubuntu/+source/networkd-dispatcher/2.1-2ubuntu0.21.10.2
 
https://launchpad.net/ubuntu/+source/networkd-dispatcher/2.1-2~ubuntu20.04.3
   https://launchpad.net/ubuntu/+source/networkd-dispatcher/1.7-0ubuntu3.5
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