ESB-2017.3027 - [RedHat] tcmu-runner: Multiple vulnerabilities 2017-11-29

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             AUSCERT External Security Bulletin Redistribution

                   Moderate: tcmu-runner security update
                             29 November 2017


        AusCERT Security Bulletin Summary

Product:           tcmu-runner
Publisher:         Red Hat
Operating System:  Red Hat Enterprise Linux Server 7
Impact/Access:     Denial of Service        -- Existing Account
                   Access Confidential Data -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2017-1000201 CVE-2017-1000200 CVE-2017-1000199

Original Bulletin:

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Hash: SHA1

                   Red Hat Security Advisory

Synopsis:          Moderate: tcmu-runner security update
Advisory ID:       RHSA-2017:3277-01
Product:           Red Hat Gluster Storage
Advisory URL:
Issue date:        2017-11-29
CVE Names:         CVE-2017-1000198 CVE-2017-1000199 CVE-2017-1000200 

1. Summary:

An update for tcmu-runner is now available for Red Hat Gluster Storage
3.3.1 for Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having a security impact
of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which
gives a detailed severity rating, is available for each vulnerability from
the CVE link(s) in the References section.

2. Relevant releases/architectures:

Red Hat Gluster Storage Server 3.3 on RHEL-7 - x86_64

3. Description:

The tcmu-runner packages provide a service that handles the complexity of
the LIO kernel target's userspace passthrough interface (TCMU). It presents
a C plugin API for extension modules that handle SCSI requests in ways not
possible or suitable to be handled by LIO's in-kernel backstores.

Security Fix(es):

* A flaw was found in the implementation of CheckConfig method in of the tcmu-runner daemon. A local, non-root user with
access to the D-Bus system bus could send a specially crafted string to
CheckConfig method resulting in various kinds of segmentation fault.

* A NULL pointer dereference flaw was found in the UnregisterHandler method
implemented in the tcmu-runner daemon. A local, non-root user with access
to the D-Bus system bus could call the UnregisterHandler method with the
name of a handler loaded internally in tcmu-runner via dlopen() to trigger
DoS. (CVE-2017-1000200)

* A NULL pointer dereference flaw was found in the UnregisterHandler method
implemented in the tcmu-runner daemon. A local, non-root user with access
to the D-Bus system bus could call UnregisterHandler method with
non-existing tcmu handler as paramater to trigger DoS. (CVE-2017-1000201)

* A file information leak flaw was found in implementation of the
CheckConfig method in of the tcmu-runner daemon. A local,
non-root user with access to the D-Bus system bus could use this flaw to
leak arbitrary file names which might not be retrievable by non-root user.

4. Solution:

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

5. Bugs fixed (

1472332 - tcmu-runner: Various security and functionality related bugfixes (multiple DoS, memory leaks)
1487246 - CVE-2017-1000198 tcmu-runner: glfs handler allows local DoS via crafted CheckConfig strings
1487247 - CVE-2017-1000201 tcmu-runner: UnregisterHandler dbus method in tcmu-runner daemon for non-existing handler causes DoS
1487251 - CVE-2017-1000200 tcmu-runner: UnregisterHandler D-Bus method in tcmu-runner daemon for internal handler causes DoS
1487252 - CVE-2017-1000199 tcmu-runner: qcow handler opens up an information leak via the CheckConfig D-Bus method

6. Package List:

Red Hat Gluster Storage Server 3.3 on RHEL-7:



These packages are GPG signed by Red Hat for security.  Our key and
details on how to verify the signature are available from

7. References:

8. Contact:

The Red Hat security contact is <>. More contact
details at

Copyright 2017 Red Hat, Inc.
Version: GnuPG v1


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