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[USN-3276-2] shadow regression

Posted on 17 May 2017
Ubuntu Security

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Ubuntu Security Notice USN-3276-2
May 17, 2017

shadow regression
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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 St=F6ckmann 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 versions:

Ubuntu 17.04:
login 1:4.2-3.2ubuntu1.17.04.2
passwd 1:4.2-3.2ubuntu1.17.04.2
uidmap 1:4.2-3.2ubuntu1.17.04.2

Ubuntu 16.10:
login 1:4.2-3.2ubuntu1.16.10.2
passwd 1:4.2-3.2ubuntu1.16.10.2
uidmap 1:4.2-3.2ubuntu1.16.10.2

Ubuntu 16.04 LTS:
login 1:4.2-3.1ubuntu5.3
passwd 1:4.2-3.1ubuntu5.3
uidmap 1:4.2-3.1ubuntu5.3

Ubuntu 14.04 LTS:
login 1:4.1.5.1-1ubuntu9.5
passwd 1:4.1.5.1-1ubuntu9.5
uidmap 1:4.1.5.1-1ubuntu9.5

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

References:
http://www.ubuntu.com/usn/usn-3276-2
http://www.ubuntu.com/usn/usn-3276-1
https://launchpad.net/bugs/1690820

Package Information:
https://launchpad.net/ubuntu/+source/shadow/1:4.2-3.2ubuntu1.17.04.2
https://launchpad.net/ubuntu/+source/shadow/1:4.2-3.2ubuntu1.16.10.2
https://launchpad.net/ubuntu/+source/shadow/1:4.2-3.1ubuntu5.3
https://launchpad.net/ubuntu/+source/shadow/1:4.1.5.1-1ubuntu9.5

 

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