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
Source: USN-3276-2: shadow regression
