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Ubuntu Security Notice USN-3968-1

Ubuntu Security Notice USN-3968-1
Posted May 6, 2019
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3968-1 - Florian Weimer discovered that Sudo incorrectly handled the noexec restriction when used with certain applications. A local attacker could possibly use this issue to bypass configured restrictions and execute arbitrary commands. It was discovered that Sudo did not properly parse the contents of /proc/[pid]/stat when attempting to determine its controlling tty. A local attacker in some configurations could possibly use this to overwrite any file on the filesystem, bypassing intended permissions. Various other issues were also addressed.

tags | advisory, arbitrary, local
systems | linux, ubuntu
advisories | CVE-2016-7076, CVE-2017-1000368
MD5 | 917a4737fb71ee1e22c48c7952c10fdb

Ubuntu Security Notice USN-3968-1

Change Mirror Download
==========================================================================
Ubuntu Security Notice USN-3968-1
May 06, 2019

sudo vulnerabilities
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 16.04 LTS

Summary:

Several security issues were fixed in Sudo.

Software Description:
- sudo: Provide limited super user privileges to specific users

Details:

Florian Weimer discovered that Sudo incorrectly handled the noexec
restriction when used with certain applications. A local attacker could
possibly use this issue to bypass configured restrictions and execute
arbitrary commands. (CVE-2016-7076)

It was discovered that Sudo did not properly parse the contents of
/proc/[pid]/stat when attempting to determine its controlling tty. A local
attacker in some configurations could possibly use this to overwrite any
file on the filesystem, bypassing intended permissions. (CVE-2017-1000368)

Update instructions:

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

Ubuntu 16.04 LTS:
sudo 1.8.16-0ubuntu1.6
sudo-ldap 1.8.16-0ubuntu1.6

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

References:
https://usn.ubuntu.com/usn/usn-3968-1
CVE-2016-7076, CVE-2017-1000368

Package Information:
https://launchpad.net/ubuntu/+source/sudo/1.8.16-0ubuntu1.6

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