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Ubuntu: USN-3276-2: shadow regression

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Ubuntu: USN-3276-2: shadow regression

Severity
4
CVSS
(AV:L/AC:M/Au:N/C:P/I:P/A:P)
Published
05/16/2017
Created
07/25/2018
Added
05/18/2017
Modified
07/09/2020

Description

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)

Solution(s)

  • ubuntu-upgrade-login
  • ubuntu-upgrade-passwd
  • ubuntu-upgrade-uidmap

References

  • USN-3276-1
  • USN-3276-2

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