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Ubuntu Security Notice USN-6190-2
September 25, 2023

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

- Ubuntu 18.04 LTS (Available with Ubuntu Pro)
- Ubuntu 16.04 LTS (Available with Ubuntu Pro)
- Ubuntu 14.04 LTS (Available with Ubuntu Pro)

Summary:

AccountsService could be made to crash or run programs if it received
specially crafted messages.

Software Description:
- accountsservice: query and manipulate user account information

Details:

USN-6190-1 fixed a vulnerability in AccountsService. This update provides
the corresponding update for Ubuntu 14.04 LTS, Ubuntu 16.04 LTS and
Ubuntu 18.04 LTS.

Original advisory details:

Kevin Backhouse discovered that AccountsService incorrectly handled certain
D-Bus messages. A local attacker could use this issue to cause
AccountsService to crash, resulting in a denial of service, or possibly
execute arbitrary code.

Update instructions:

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

Ubuntu 18.04 LTS (Available with Ubuntu Pro):
accountsservice 0.6.45-1ubuntu1.3+esm1
libaccountsservice0 0.6.45-1ubuntu1.3+esm1

Ubuntu 16.04 LTS (Available with Ubuntu Pro):
accountsservice 0.6.40-2ubuntu11.6+esm1
libaccountsservice0 0.6.40-2ubuntu11.6+esm1

Ubuntu 14.04 LTS (Available with Ubuntu Pro):
accountsservice 0.6.35-0ubuntu7.3+esm3
libaccountsservice0 0.6.35-0ubuntu7.3+esm3

After a standard system update you need to reboot your computer to make all
the necessary changes.

References:
https://ubuntu.com/security/notices/USN-6190-2
https://ubuntu.com/security/notices/USN-6190-1
CVE-2023-3297