Advisory Published

USN-3887-1: snapd vulnerability

First published: Tue Feb 12 2019(Updated: )

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.

Affected SoftwareAffected VersionHow to fix
All of
ubuntu/snapd<2.35.5+18.10.1
2.35.5+18.10.1
Ubuntu OpenSSH Client=18.10
All of
ubuntu/snapd<2.34.2+18.04.1
2.34.2+18.04.1
Ubuntu OpenSSH Client=18.04
All of
ubuntu/snapd<2.34.2ubuntu0.1
2.34.2ubuntu0.1
Ubuntu OpenSSH Client=16.04
All of
ubuntu/snapd<2.34.2~14.04.1
2.34.2~14.04.1
Ubuntu OpenSSH Client=14.04

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Child vulnerabilities

(Contains the following vulnerabilities)

Frequently Asked Questions

  • What is the severity of USN-3887-1?

    The severity of USN-3887-1 is critical due to the potential for local attackers to gain administrator privileges.

  • How do I fix USN-3887-1?

    To fix USN-3887-1, upgrade snapd to version 2.35.5+18.10.1 or later for Ubuntu 18.10, 2.34.2+18.04.1 or later for Ubuntu 18.04, 2.34.2ubuntu0.1 or later for Ubuntu 16.04, or 2.34.2~14.04.1 or later for Ubuntu 14.04.

  • What versions of Ubuntu are affected by USN-3887-1?

    USN-3887-1 affects Ubuntu versions 14.04, 16.04, 18.04, and 18.10 with specific vulnerable versions of snapd.

  • Who discovered the vulnerability in USN-3887-1?

    The vulnerability in USN-3887-1 was discovered by Chris Moberly.

  • What does the vulnerability USN-3887-1 allow attackers to do?

    USN-3887-1 allows local attackers to improperly access privileged socket APIs, potentially leading to elevated privileges.

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