USN-3276-1: shadow vulnerabilities

USN-3276-1: shadow vulnerabilities

Ubuntu Security Notice USN-3276-1

5th May, 2017

shadow vulnerabilities

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

su could be made to crash or stop programs as an administrator.

Software description

• shadow
  – system login tools

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

1:4.2-3.2ubuntu1.17.04.1

login

1:4.2-3.2ubuntu1.17.04.1

uidmap

1:4.2-3.2ubuntu1.17.04.1

Ubuntu 16.10:

passwd

1:4.2-3.2ubuntu1.16.10.1

login

1:4.2-3.2ubuntu1.16.10.1

uidmap

1:4.2-3.2ubuntu1.16.10.1

Ubuntu 16.04 LTS:

passwd

1:4.2-3.1ubuntu5.2

login

1:4.2-3.1ubuntu5.2

uidmap

1:4.2-3.1ubuntu5.2

Ubuntu 14.04 LTS:

passwd

1:4.1.5.1-1ubuntu9.4

login

1:4.1.5.1-1ubuntu9.4

uidmap

1:4.1.5.1-1ubuntu9.4

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

CVE-2016-6252,

CVE-2017-2616

Source: USN-3276-1: shadow vulnerabilities