USN-4705-1: Sudo vulnerabilities

Releases

• Ubuntu 20.10
• Ubuntu 20.04 LTS
• Ubuntu 18.04 ESM
• Ubuntu 16.04 ESM

Packages

• 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

• sudo - 1.9.1-1ubuntu1.1
• sudo-ldap - 1.9.1-1ubuntu1.1

Ubuntu 20.04

• sudo - 1.8.31-1ubuntu1.2
• sudo-ldap - 1.8.31-1ubuntu1.2

Ubuntu 18.04

• sudo - 1.8.21p2-3ubuntu1.4
• sudo-ldap - 1.8.21p2-3ubuntu1.4

Ubuntu 16.04

• sudo - 1.8.16-0ubuntu1.10
• sudo-ldap - 1.8.16-0ubuntu1.10

In general, a standard system update will make all the necessary changes.

References

• CVE-2021-3156
• CVE-2021-23239

Related notices

• USN-4705-2: sudo-ldap, sudo