USN-4001-1: libseccomp vulnerability

libseccomp vulnerability

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

Ubuntu 19.04
Ubuntu 18.10
Ubuntu 18.04 LTS
Ubuntu 16.04 LTS

Summary

libseccomp could allow unintended access to system calls.

Software Description

libseccomp – library for working with the Linux seccomp filter

Details

Jann Horn discovered that libseccomp did not correctly generate 64-bit
syscall argument comparisons with arithmetic operators (LT, GT, LE, GE).
An attacker could use this to bypass intended access restrictions for
argument-filtered system calls.

Update instructions

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

Ubuntu 19.04: libseccomp2 – 2.4.1-0ubuntu0.19.04.3
Ubuntu 18.10: libseccomp2 – 2.4.1-0ubuntu0.18.10.3
Ubuntu 18.04 LTS: libseccomp2 – 2.4.1-0ubuntu0.18.04.2
Ubuntu 16.04 LTS: libseccomp2 – 2.4.1-0ubuntu0.16.04.2

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

This update uses a new upstream release which includes additional bug
fixes. In general, a standard system update will make all the necessary
changes.