Bug 1730300 (CVE-2019-13226)

Summary:	CVE-2019-13226 deepin-clone: predictable path in the Helper::temporaryMountDevice() function enabling a symlink exploit
Product:	[Other] Security Response	Reporter:	Marian Rehak <mrehak>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED UPSTREAM	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	robinlee.sysu, sensor.wen, sztsian
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2019-07-16 14:40:47 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:	1730301
Bug Blocks:

Description Marian Rehak 2019-07-16 12:18:11 UTC

deepin-clone before 1.1.3 uses a predictable path /tmp/.deepin-clone/mount/<block-dev-basename> in the Helper::temporaryMountDevice() function to temporarily mount a file system as root. An unprivileged user can prepare a symlink at this location to have the file system mounted in an arbitrary location. By winning a race condition, the attacker can also enter the mount point, thereby preventing a subsequent unmount of the file system.

External Reference:

https://bugzilla.suse.com/show_bug.cgi?id=1130388

Comment 1 Marian Rehak 2019-07-16 12:18:24 UTC

Created deepin-clone tracking bugs for this issue:

Affects: fedora-30 [bug 1730301]

Comment 2 Product Security DevOps Team 2019-07-16 14:40:47 UTC

This CVE Bugzilla entry is for community support informational purposes only as it does not affect a package in a commercially supported Red Hat product. Refer to the dependent bugs for status of those individual community products.