Ubuntu: Moderate Security Update 3887-1 for snapd Access Control Issue

ubuntu

February 12, 2019

snapd could be made to run programs as an administrator.

Summary

snapd could be made to run programs as an administrator.

Software Description:

- snapd: Daemon and tooling that enable snap packages

Details:

Chris Moberly discovered that snapd versions 2.28 through 2.37 incorrectly

validated and parsed the remote socket address when performing access

controls on its UNIX socket. A local attacker could use this to access

privileged socket APIs and obtain administrator privileges. On Ubuntu

systems with snaps installed, snapd typically will have already

automatically refreshed itself to snapd 2.37.1 which is unaffected.

Topics Covered

security advisory security issue software update privilege escalation access control Ubuntu snapd

Update Instructions

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 18.10:
  snapd                           2.35.5+18.10.1

Ubuntu 18.04 LTS:
  snapd                           2.34.2+18.04.1

Ubuntu 16.04 LTS:
  snapd                           2.34.2ubuntu0.1

Ubuntu 14.04 LTS:
  snapd                           2.34.2~14.04.1

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