Ubuntu Security Update USN-3276-2: shadow regression

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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

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