Bug 1487246 – CVE-2017-1000198 tcmu-runner: glfs handler allows local DoS via crafted CheckConfig strings

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Bug 1487246 - (CVE-2017-1000198) CVE-2017-1000198 tcmu-runner: glfs handler allows local DoS via crafted CheckConfig strings

Summary:	CVE-2017-1000198 tcmu-runner: glfs handler allows local DoS via crafted Check...

Status:	NEW

Aliases:	CVE-2017-1000198

Product:	Security Response
Classification:	Other
Component:	vulnerability (Show other bugs)
Sub Component:
Version:	unspecified
Hardware:	All Linux

Priority	medium Severity medium
Target Milestone:	---
Target Release:	---
Assigned To:	Red Hat Product Security
QA Contact:
Docs Contact:

URL:
Whiteboard:	impact=moderate,public=20170521,repor...
Keywords:	Security

Depends On:	1487255 1494514 1494511
Blocks:	1487254
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Reported:	2017-08-31 09:41 EDT by Andrej Nemec
Modified:	2017-11-28 22:33 EST (History)
CC List:	7 users (show)

See Also:
Fixed In Version:
Doc Type:	If docs needed, set a value
Doc Text:	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.
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Last Closed:
Type:	---
Regression:	---
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oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
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External Trackers
Tracker	ID	Priority	Status	Summary	Last Updated
Red Hat Product Errata	RHSA-2017:3277	normal	SHIPPED_LIVE	Moderate: tcmu-runner security update	2017-11-29 03:32:51 EST

Groups: None (edit)

Description Andrej Nemec 2017-08-31 09:41:00 EDT

A local non-root user with access to the D-Bus system bus can call the
CheckConfig method implemented in the tcmu-runner daemon via
handler_glfs.so and cause various kinds of segmentation faults,
depending on the string passed to the method.

For example the "hosts" variable in glfs_check_config() is not zero
initialized, but always freed on error, causing invalid free and/or
invalid memory accesses.

Upstream patch:

https://github.com/open-iscsi/tcmu-runner/commit/61bd03e600d2abf309173e9186f4d465bb1b7157

References:

http://seclists.org/oss-sec/2017/q3/207

Comment 1 Andrej Nemec 2017-08-31 09:50:24 EDT

Created tcmu-runner tracking bugs for this issue:

Affects: fedora-all [bug 1487255]

Comment 4 errata-xmlrpc 2017-11-28 22:33:27 EST

This issue has been addressed in the following products:

  Red Hat Gluster Storage 3.3 for RHEL 7

Via RHSA-2017:3277 https://access.redhat.com/errata/RHSA-2017:3277

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