USN-4001-1: libseccomp vulnerability

Releases

• Ubuntu 19.04
• Ubuntu 18.10
• Ubuntu 18.04 ESM
• Ubuntu 16.04 ESM

Packages

• 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

• libseccomp2 - 2.4.1-0ubuntu0.18.04.2

Ubuntu 16.04

• 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

• CVE-2019-9893

Related notices

• USN-4001-2: libseccomp, seccomp, libseccomp-dev, libseccomp2