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Ubuntu 21.10, 21.04, 20.04 LTS USN-5149-1: Critical AccountsService Flaw

ubuntu
Calendar Grey November 16, 2021
Dist Ubuntu Esm H88
The identified AccountsService vulnerability poses a severe security risk in multiple Ubuntu versions, enabling unauthorized elevation of user privileges and system access.
AccountsService could be made to crash or run programs as an administrator if it received a specially crafted command.

Summary

AccountsService could be made to crash or run programs as an administrator

if it received a specially crafted command.

Software Description:

- accountsservice: query and manipulate user account information

Details:

Kevin Backhouse discovered that AccountsService incorrectly handled memory

when performing certain language setting operations. A local attacker could

use this issue to escalate privileges.

Topics%20covered

Topics Covered

security advisory critical ubuntu administrative access accountsservice

Update Instructions

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

Ubuntu 21.10:
  accountsservice                 0.6.55-0ubuntu14.1
  libaccountsservice0             0.6.55-0ubuntu14.1

Ubuntu 21.04:
  accountsservice                 0.6.55-0ubuntu13.3
  libaccountsservice0             0.6.55-0ubuntu13.3

Ubuntu 20.04 LTS:
  accountsservice                 0.6.55-0ubuntu12~20.04.5
  libaccountsservice0             0.6.55-0ubuntu12~20.04.5

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

References

https://ubuntu.com/security/notices/USN-5149-1

CVE-2021-3939

Severity
critical
Lowest
Low
Medium
High
Critical

November 16, 2021

Topics%20covered

Topics Covered

security advisory critical ubuntu administrative access accountsservice

Package Information

https://launchpad.net/ubuntu/+source/accountsservice/0.6.55-0ubuntu14.1
https://launchpad.net/ubuntu/+source/accountsservice/0.6.55-0ubuntu13.3
https://launchpad.net/ubuntu/+source/accountsservice/0.6.55-0ubuntu12~20.04.5

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