[USN-4001-1] libseccomp vulnerability

[Jamie Strandboge]

==========================================================================
Ubuntu Security Notice USN-4001-1
May 30, 2019

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

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

References:
  https://usn.ubuntu.com/usn/usn-4001-1
  CVE-2019-9893

Package Information:
  https://launchpad.net/ubuntu/+source/libseccomp/2.4.1-0ubuntu0.19.04.3
  https://launchpad.net/ubuntu/+source/libseccomp/2.4.1-0ubuntu0.18.10.3
  https://launchpad.net/ubuntu/+source/libseccomp/2.4.1-0ubuntu0.18.04.2
  https://launchpad.net/ubuntu/+source/libseccomp/2.4.1-0ubuntu0.16.04.2
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