RHSA-2017:3277 - Security Advisory

Topic

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.

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 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)

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

Affected Products

• Red Hat Gluster Storage Server for On-premise 3 for RHEL 7 x86_64

Fixes

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

CVEs

• CVE-2017-1000198
• CVE-2017-1000199
• CVE-2017-1000200
• CVE-2017-1000201

References

• https://access.redhat.com/security/updates/classification/#moderate