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AUSCERT External Security Bulletin Redistribution
ESB-2021.3929
USN-5149-1: AccountsService vulnerability
17 November 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: AccountsService
Publisher: Ubuntu
Operating System: Ubuntu
Linux variants
Impact/Access: Increased Privileges -- Existing Account
Denial of Service -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2021-3939
Original Bulletin:
https://ubuntu.com/security/notices/USN-5149-1
Comment: This advisory references vulnerabilities in the Linux kernel that
also affect distributions other than Ubuntu. It is recommended that
administrators running Linux check for an updated version of the
kernel for their system.
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USN-5149-1: AccountsService vulnerability
16 November 2021
AccountsService could be made to crash or run programs as an administrator
if it received a specially crafted command.
Releases
o Ubuntu 21.10
o Ubuntu 21.04
o Ubuntu 20.04 LTS
Packages
o 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.
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 21.10
o accountsservice - 0.6.55-0ubuntu14.1
o libaccountsservice0 - 0.6.55-0ubuntu14.1
Ubuntu 21.04
o accountsservice - 0.6.55-0ubuntu13.3
o libaccountsservice0 - 0.6.55-0ubuntu13.3
Ubuntu 20.04
o accountsservice - 0.6.55-0ubuntu12~20.04.5
o 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
o CVE-2021-3939
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