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.

References

• CVE-2019-9893

from Ubuntu Security Notices http://bit.ly/2EJVb9j