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Red Hat: RHSA-2017:3277-01 Moderate: tcmu-runner Local DoS & Leak

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Calendar Grey November 29, 2017
Scroller Redhat
A recent security enhancement for tcmu-runner within Red Hat Gluster Storage mitigates local denial-of-service vulnerabilities and resolves potential information disclosure concerns.
An update for tcmu-runner is now available for Red Hat Gluster Storage 3.3.1 for Red Hat Enterprise Linux 7

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

Summary

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 handler_glfs.so 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. (CVE-2017-1000198)
* 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 handler_qcow.so 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. (CVE-2017-1000199)

Topics%20covered

Topics Covered

security advisory moderate Red Hat information leak security fix local DoS tcmu-runner

References

https://access.redhat.com/security/cve/CVE-2017-1000198 https://access.redhat.com/security/cve/CVE-2017-1000199 https://access.redhat.com/security/cve/CVE-2017-1000200 https://access.redhat.com/security/cve/CVE-2017-1000201 https://access.redhat.com/security/updates/classification/#moderate

Package List

Red Hat Gluster Storage Server 3.3 on RHEL-7:
Source: tcmu-runner-1.2.0-16.el7rhgs.src.rpm
x86_64: libtcmu-1.2.0-16.el7rhgs.x86_64.rpm libtcmu-devel-1.2.0-16.el7rhgs.x86_64.rpm tcmu-runner-1.2.0-16.el7rhgs.x86_64.rpm tcmu-runner-debuginfo-1.2.0-16.el7rhgs.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/


Advisory ID: RHSA-2017:3277-01
Product: Red Hat Gluster Storage
Advisory URL: https://access.redhat.com/errata/RHSA-2017:3277
Issue date: 2017-11-29

Topic

An update for tcmu-runner is now available for Red Hat Gluster Storage3.3.1 for Red Hat Enterprise Linux 7.Red Hat Product Security has rated this update as having a security impactof Moderate. A Common Vulnerability Scoring System (CVSS) base score, whichgives a detailed severity rating, is available for each vulnerability fromthe CVE link(s) in the References section.

Topics%20covered

Topics Covered

security advisory moderate Red Hat information leak security fix local DoS tcmu-runner

Relevant Releases Architectures

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

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

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