Ubuntu alert USN-4001-2 (libseccomp)

From:
             
 
Jamie Strandboge <jamie@canonical.com> 
To:
             
 
ubuntu-security-announce@lists.ubuntu.com 
Subject:
             
 
[USN-4001-2] libseccomp vulnerability 
Date:
             
 
Thu, 30 May 2019 18:09:49 -0500
Message-ID:
             
 
<20190530230949.GE24724@iolanthe>
==========================================================================
Ubuntu Security Notice USN-4001-2
May 30, 2019

libseccomp vulnerability
==========================================================================

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

- Ubuntu 14.04 ESM

Summary:

libseccomp could allow unintended access to system calls.

Software Description:
- libseccomp: library for working with the Linux seccomp filter

Details:

USN-4001-1 fixed a vulnerability in libseccomp. This update provides the
corresponding update for Ubuntu 14.04 ESM.

Original advisory 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 14.04 ESM:
  libseccomp2                     2.4.1-0ubuntu0.14.04.2

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-4001-2
  https://usn.ubuntu.com/usn/usn-4001-1
  CVE-2019-9893
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