Bug 1231816 (CVE-2015-1850)

Summary:	CVE-2015-1850 openstack-nova: Host file disclosure through qcow2 backing file
Product:	[Other] Security Response	Reporter:	Vasyl Kaigorodov <vkaigoro>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED WONTFIX	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	abaron, akscram, alexander.sakhnov, aortega, apevec, apevec, ayoung, berrange, bfilippov, carnil, chrisw, dallan, dasmith, davidx, eglynn, gkotton, gmollett, itamar, jjoyce, jonathansteffan, jose.castro.leon, jschluet, kbasil, kchamart, lhh, lpeer, markmc, mburns, mlvov, mmagr, p, rbryant, rk, sbauza, sclewis, sferdjao, sgordon, slinaber, slong, srevivo, tdecacqu, vladanovic, vromanso
Target Milestone:	---	Keywords:	Reopened, Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:	A flaw was found in how the OpenStack Compute (nova) service handles the qemu-img functionality during a snapshot upload. An authenticated attacker could possibly use this flaw to trick Compute into disclosing any file to which the Compute service user has access. However, it is unlikely that the code path can currently be exploited by an attacker.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2017-12-19 01:04:50 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	1231819, 1231820, 1232929, 1232930, 1232931, 1232932
Bug Blocks:	1231818

Description Vasyl Kaigorodov 2015-06-15 12:48:15 UTC

Title: Host file disclosure through qcow2 backing file
Reporter: Bastian Blank (credativ)
Products: Cinder and Nova
Affects: up to 2014.1.4 and 2014.2 versions through 2014.2.2

Description:
Bastian Blank from credativ reported a vulnerability in Cinder and Nova.
By overwriting an image with a malicious qcow2 header, an authenticated
user may mislead Cinder upload-to-image action, resulting in disclosure
of any file from the Cinder server. A similar vulnerability in Nova can
also be used by an authenticated user to trick Nova during a snapshot
upload, resulting in disclosure of any file for which the Nova process
user has access to. All Cinder and Nova setups are affected.

Upstream bug: https://bugs.launchpad.net/cinder/+bug/1415087
Suggested patches can be found here:
https://bugs.launchpad.net/cinder/+bug/1415087/+attachment/4362440/+files/0001-Disallow-backing-files-when-uploading-volumes-to-ima.patch
https://bugs.launchpad.net/cinder/+bug/1415087/+attachment/4340460/+files/0001-Require-source-image-format-for-convert_image-calls.patch

Comment 1 Vasyl Kaigorodov 2015-06-15 12:51:55 UTC

Created openstack-nova tracking bugs for this issue:

Affects: fedora-all [bug 1231819]
Affects: openstack-rdo [bug 1231820]

Comment 4 Garth Mollett 2015-06-30 03:37:00 UTC

Statement:

Red Hat Product Security has rated this issue as having Low security impact in all supported versions of Red Hat Enterprise Linux OpenStack Platform. While this issue is present, we do not believe the code path is currently reachable in an attacker exploitable fashion.

A future update may address this flaw.