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AUSCERT External Security Bulletin Redistribution
ESB-2021.1943
USN-4980-1: polkit vulnerability
4 June 2021
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AusCERT Security Bulletin Summary
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Product: polkit
Publisher: Ubuntu
Operating System: Ubuntu
Impact/Access: Increased Privileges -- Existing Account
Denial of Service -- Existing Account
Access Confidential Data -- Existing Account
Reduced Security -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2021-3560
Reference: ESB-2021.1940
ESB-2021.1928
Original Bulletin:
https://ubuntu.com/security/notices/USN-4980-1
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USN-4980-1: polkit vulnerability
03 June 2021
The system could be made to run programs as an administrator.
Releases
o Ubuntu 21.04
o Ubuntu 20.10
o Ubuntu 20.04 LTS
Packages
o policykit-1 - framework for managing administrative policies and privileges
Details
Kevin Backhouse discovered that polkit incorrectly handled errors in the
polkit_system_bus_name_get_creds_sync function. A local attacker could
possibly use this issue to escalate privileges.
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 21.04
o libpolkit-agent-1-0 - 0.105-30ubuntu0.1
o libpolkit-gobject-1-0 - 0.105-30ubuntu0.1
o policykit-1 - 0.105-30ubuntu0.1
Ubuntu 20.10
o libpolkit-agent-1-0 - 0.105-29ubuntu0.1
o libpolkit-gobject-1-0 - 0.105-29ubuntu0.1
o policykit-1 - 0.105-29ubuntu0.1
Ubuntu 20.04
o libpolkit-agent-1-0 - 0.105-26ubuntu1.1
o libpolkit-gobject-1-0 - 0.105-26ubuntu1.1
o policykit-1 - 0.105-26ubuntu1.1
After a standard system update you need to reboot your computer to make
all the necessary changes.
References
o CVE-2021-3560
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