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Ubuntu Security Notice USN-4001-1

Ubuntu Security Notice USN-4001-1
Posted May 30, 2019
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4001-1 - Jann Horn discovered that libseccomp did not correctly generate 64-bit syscall argument comparisons with arithmetic operators. An attacker could use this to bypass intended access restrictions for argument-filtered system calls.

tags | advisory
systems | linux, ubuntu
advisories | CVE-2019-9893
MD5 | fd881656726a00a51d46470323a31f91

Ubuntu Security Notice USN-4001-1

Change Mirror Download
==========================================================================
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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