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Ubuntu Security Notice USN-4001-2

Ubuntu Security Notice USN-4001-2
Posted May 30, 2019
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4001-2 - USN-4001-1 fixed a vulnerability in libseccomp. This update provides the corresponding update for Ubuntu 14.04 ESM. 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. Various other issues were also addressed.

tags | advisory
systems | linux, ubuntu
advisories | CVE-2019-9893
MD5 | db9d4092379567c878c0d3825ea5365b

Ubuntu Security Notice USN-4001-2

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