USN-3276-2: shadow regression

Ubuntu Security Notice USN-3276-2

16th May, 2017

shadow regression

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

Ubuntu 17.04
Ubuntu 16.10
Ubuntu 16.04 LTS
Ubuntu 14.04 LTS

Summary

USN-3276-1 introduced a regression in su.

Software description

shadow
– system login tools

Details

USN-3276-1 intended to fix a vulnerability in su. The solution introduced
a regression in su signal handling. This update modifies the security fix.
We apologize for the inconvenience.

Original advisory details:

Sebastian Krahmer discovered integer overflows in shadow utilities.
A local attacker could possibly cause them to crash or potentially
gain privileges via crafted input. (CVE-2016-6252)

Tobias Stöckmann discovered a race condition in su. A local
attacker could cause su to send SIGKILL to other processes with
root privileges. (CVE-2017-2616)

Update instructions

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

Ubuntu 17.04:: passwd

1:4.2-3.2ubuntu1.17.04.2; login

1:4.2-3.2ubuntu1.17.04.2; uidmap

1:4.2-3.2ubuntu1.17.04.2
Ubuntu 16.10:: passwd

1:4.2-3.2ubuntu1.16.10.2; login

1:4.2-3.2ubuntu1.16.10.2; uidmap

1:4.2-3.2ubuntu1.16.10.2
Ubuntu 16.04 LTS:: passwd

1:4.2-3.1ubuntu5.3; login

1:4.2-3.1ubuntu5.3; uidmap

1:4.2-3.1ubuntu5.3
Ubuntu 14.04 LTS:: passwd

1:4.1.5.1-1ubuntu9.5; login

1:4.1.5.1-1ubuntu9.5; uidmap

1:4.1.5.1-1ubuntu9.5

To update your system, please follow these instructions:
https://wiki.ubuntu.com/Security/Upgrades.

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

References

LP: 1690820

Source: USN-3276-2: shadow regression

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