Executive Summary

Summary
Title snapd vulnerability
Informations
Name USN-3917-1 First vendor Publication 2019-03-21
Vendor Ubuntu Last vendor Modification 2019-03-21
Severity (Vendor) N/A Revision N/A

Security-Database Scoring CVSS v3

Cvss vector : N/A
Overall CVSS Score NA
Base Score NA Environmental Score NA
impact SubScore NA Temporal Score NA
Exploitabality Sub Score NA
 
Calculate full CVSS 3.0 Vectors scores

Security-Database Scoring CVSS v2

Cvss vector :
Cvss Base Score N/A Attack Range N/A
Cvss Impact Score N/A Attack Complexity N/A
Cvss Expoit Score N/A Authentication N/A
Calculate full CVSS 2.0 Vectors scores

Detail

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 18.10 - Ubuntu 18.04 LTS - Ubuntu 16.04 LTS - Ubuntu 14.04 LTS

Summary:

An intended access restriction in snapd could be bypassed by strict mode snaps on 64 bit architectures.

Software Description: - snapd: Daemon and tooling that enable snap packages

Details:

The snapd default seccomp filter for strict mode snaps blocks the use of the ioctl() system call when used with TIOCSTI as the second argument to the system call. Jann Horn discovered that this restriction could be circumvented on 64 bit architectures. A malicious snap could exploit this to bypass intended access restrictions to insert characters into the terminal's input queue. On Ubuntu, snapd typically will have already automatically refreshed itself to snapd 2.37.4 which is unaffected.

Update instructions:

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

Ubuntu 18.10:
snapd 2.37.4+18.10.1

Ubuntu 18.04 LTS:
snapd 2.37.4+18.04.1

Ubuntu 16.04 LTS:
snapd 2.37.4ubuntu0.1

Ubuntu 14.04 LTS:
snapd 2.37.4~14.04.1

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

References:
https://usn.ubuntu.com/usn/usn-3917-1
CVE-2019-7303, https://launchpad.net/bugs/1812973

Package Information:
https://launchpad.net/ubuntu/+source/snapd/2.37.4+18.10.1
https://launchpad.net/ubuntu/+source/snapd/2.37.4+18.04.1
https://launchpad.net/ubuntu/+source/snapd/2.37.4ubuntu0.1
https://launchpad.net/ubuntu/+source/snapd/2.37.4~14.04.1

Original Source

Url : http://www.ubuntu.com/usn/USN-3917-1

Alert History

If you want to see full details history, please login or register.
0
Date Informations
2019-03-22 00:18:13
  • First insertion