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AUSCERT External Security Bulletin Redistribution
ESB-2021.0287
USN-4705-1: Sudo vulnerabilities
27 January 2021
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AusCERT Security Bulletin Summary
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Product: Sudo
Publisher: Ubuntu
Operating System: Ubuntu
Impact/Access: Root Compromise -- Existing Account
Access Confidential Data -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2021-23239 CVE-2021-3156
Reference: ESB-2021.0281
Original Bulletin:
https://ubuntu.com/security/notices/USN-4705-1
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USN-4705-1: Sudo vulnerabilities
26 January 2021
Several security issues were fixed in Sudo.
Releases
o Ubuntu 20.10
o Ubuntu 20.04 LTS
o Ubuntu 18.04 LTS
o Ubuntu 16.04 LTS
Packages
o sudo - Provide limited super user privileges to specific users
Details
It was discovered that Sudo incorrectly handled memory when parsing command
lines. A local attacker could possibly use this issue to obtain unintended
access to the administrator account. ( CVE-2021-3156 )
It was discovered that the Sudo sudoedit utility incorrectly handled
checking directory permissions. A local attacker could possibly use this
issue to bypass file permissions and determine if a directory exists or
not. ( CVE-2021-23239 )
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 20.10
o sudo - 1.9.1-1ubuntu1.1
o sudo-ldap - 1.9.1-1ubuntu1.1
Ubuntu 20.04
o sudo - 1.8.31-1ubuntu1.2
o sudo-ldap - 1.8.31-1ubuntu1.2
Ubuntu 18.04
o sudo - 1.8.21p2-3ubuntu1.4
o sudo-ldap - 1.8.21p2-3ubuntu1.4
Ubuntu 16.04
o sudo - 1.8.16-0ubuntu1.10
o sudo-ldap - 1.8.16-0ubuntu1.10
In general, a standard system update will make all the necessary changes.
References
o CVE-2021-3156
o CVE-2021-23239
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