Bug 1597495

Summary:	accountsservice: Improper path validation of user icon files allows for spoofing via symlink
Product:	[Other] Security Response	Reporter:	Sam Fowler <sfowler>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED DUPLICATE	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	mclasen, rstrode, stefw
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:	2018-07-13 19:17:39 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:	1597497, 1597499
Bug Blocks:	1597500

Description Sam Fowler 2018-07-03 05:41:43 UTC

GNOME AccountsService does not properly validate the filepaths of user icon files in the user.c:user_change_icon_file_authorized_cb() function. An attacker could exploit this by providing a crafted path via  D-Bus message and replacing it with a symlink. Third party applications that trust this path can potentially read from its location as root and try to interpret it as an image file.


External Reference:

http://www.openwall.com/lists/oss-security/2018/07/02/2


Upstream Bug:

https://bugs.freedesktop.org/show_bug.cgi?id=107085

Comment 1 Sam Fowler 2018-07-03 05:42:08 UTC

Created accountsservice tracking bugs for this issue:

Affects: fedora-all [bug 1597497]

Comment 3 Sam Fowler 2018-07-03 05:42:55 UTC

openSUSE Bug:

https://bugzilla.novell.com/show_bug.cgi?id=1099699

Comment 4 Tomas Hoger 2018-07-13 19:17:39 UTC


*** This bug has been marked as a duplicate of bug 1601019 ***