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Red Hat Security Advisory 2020-5607-01

Red Hat Security Advisory 2020-5607-01
Posted Dec 17, 2020
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2020-5607-01 - The fapolicyd software framework introduces a form of file access control based on a user-defined policy. The application file access control feature provides one of the most efficient ways to prevent running untrusted and possibly malicious applications on the system. Bug Fix: When an update replaces the binary of a running application, the kernel modifies the application binary path in memory by appending the " " suffix. Previously, the fapolicyd file access policy daemon treated such applications as untrusted, and prevented them from opening and executing any other files. As a consequence, the system was sometimes unable to boot after applying updates.

tags | advisory, kernel
systems | linux, redhat
MD5 | cfb74db3da4ac6bab83e48f5b36acb9c

Red Hat Security Advisory 2020-5607-01

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=====================================================================
Red Hat Security Advisory

Synopsis: Important: fapolicyd bug fix update
Advisory ID: RHSA-2020:5607-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2020:5607
Issue date: 2020-12-17
=====================================================================

1. Summary:

An update for fapolicyd is now available for Red Hat Enterprise Linux 8.

2. Relevant releases/architectures:

Red Hat Enterprise Linux AppStream (v. 8) - aarch64, noarch, ppc64le, s390x, x86_64

3. Description:

The fapolicyd software framework introduces a form of file access control
based on a user-defined policy. The application file access control feature
provides one of the most efficient ways to prevent running untrusted and
possibly malicious applications on the system.

Bug Fix(es):

* When an update replaces the binary of a running application, the kernel
modifies the application binary path in memory by appending the "
(deleted)" suffix. Previously, the fapolicyd file access policy daemon
treated such applications as untrusted, and prevented them from opening and
executing any other files. As a consequence, the system was sometimes
unable to boot after applying updates.

With this update, fapolicyd ignores the suffix in the binary path so the
binary can match the trust database. As a result, fapolicyd enforces the
rules correctly and the update process can finish.

(BZ#1906472)

* Adding DISA STIG during OS installation causes 'ipa-server-install' to
fail

(BZ#1905895)

Note: The issue from BZ#1906472 was previously addressed in erratum
RHBA-2020:5242 linked to from the References section. Due to the high
impact of the issue that can cause systems to become unable to boot, we are
releasing the same fix again in a security erratum to ensure proper
visibility to users who only install security updates. This fix has not
been changed in any way since the original bug fix erratum. This erratum
does not provide any security fixes.

For more details about the issue, see the Knowledgebase article linked from
the References section.

4. Solution:

For details on how to apply this update, which includes the changes
described in this advisory, refer to:

https://access.redhat.com/articles/11258

5. Bugs fixed (https://bugzilla.redhat.com/):

1905895 - Adding DISA STIG during OS installation causes 'ipa-server-install' to fail [rhel-8.3.0.z]
1906472 - Erratum RHBA-2020:4969 is of no help when upgrading partially RHEL 8.2 systems [rhel-8.3.0.z]

6. Package List:

Red Hat Enterprise Linux AppStream (v. 8):

Source:
fapolicyd-1.0-3.el8_3.4.src.rpm

aarch64:
fapolicyd-1.0-3.el8_3.4.aarch64.rpm
fapolicyd-debuginfo-1.0-3.el8_3.4.aarch64.rpm
fapolicyd-debugsource-1.0-3.el8_3.4.aarch64.rpm

noarch:
fapolicyd-selinux-1.0-3.el8_3.4.noarch.rpm

ppc64le:
fapolicyd-1.0-3.el8_3.4.ppc64le.rpm
fapolicyd-debuginfo-1.0-3.el8_3.4.ppc64le.rpm
fapolicyd-debugsource-1.0-3.el8_3.4.ppc64le.rpm

s390x:
fapolicyd-1.0-3.el8_3.4.s390x.rpm
fapolicyd-debuginfo-1.0-3.el8_3.4.s390x.rpm
fapolicyd-debugsource-1.0-3.el8_3.4.s390x.rpm

x86_64:
fapolicyd-1.0-3.el8_3.4.x86_64.rpm
fapolicyd-debuginfo-1.0-3.el8_3.4.x86_64.rpm
fapolicyd-debugsource-1.0-3.el8_3.4.x86_64.rpm

These packages are GPG signed by Red Hat for security. Our key and
details on how to verify the signature are available from
https://access.redhat.com/security/team/key/

7. References:

https://access.redhat.com/security/updates/classification/#important
https://access.redhat.com/errata/RHBA-2020:5242
https://access.redhat.com/solutions/5542661

8. Contact:

The Red Hat security contact is <secalert@redhat.com>. More contact
details at https://access.redhat.com/security/team/contact/

Copyright 2020 Red Hat, Inc.
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