USN-3887-1: snapd vulnerability

Releases

• Ubuntu 18.10
• Ubuntu 18.04 ESM
• Ubuntu 16.04 ESM
• Ubuntu 14.04 ESM

Packages

• 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.

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

• snapd - 2.34.2+18.04.1

Ubuntu 16.04

• snapd - 2.34.2ubuntu0.1

Ubuntu 14.04

• snapd - 2.34.2~14.04.1

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

References

• CVE-2019-7304
• https://launchpad.net/bugs/1813365