Bug 1938291 (CVE-2021-28153)

Summary:	CVE-2021-28153 glib: g_file_replace() with G_FILE_CREATE_REPLACE_DESTINATION creates empty target for dangling symlink
Product:	[Other] Security Response	Reporter:	Guilherme de Almeida Suckevicz <gsuckevi>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	caillon+fedoraproject, erack, erik-fedora, fedora, fidencio, gnome-sig, jhorak, kaycoth, klember, manisandro, marcandre.lureau, mcatanza, mclasen, mdean, nobody, pahan, paul, rdieter, rhel8-maint, rh-spice-bugs, rhughes, rjones, rstrode, sandmann, stransky, tiagomatos, tpopela, vmugicag, walters
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	glib 2.67.6	Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-11-09 19:52:15 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:	1938292, 1938293, 1938294, 1938295, 1939116, 1939117, 1939118, 1939119, 1939120
Bug Blocks:	1938296

Description Guilherme de Almeida Suckevicz 2021-03-12 17:21:58 UTC

An issue was discovered in GNOME GLib before 2.66.8. When g_file_replace() is used with G_FILE_CREATE_REPLACE_DESTINATION to replace a path that is a dangling symlink, it incorrectly also creates the target of the symlink as an empty file, which could conceivably have security relevance if the symlink is attacker-controlled. (If the path is a symlink to a file that already exists, then the contents of that file correctly remain unchanged.)

References:
https://gitlab.gnome.org/GNOME/glib/-/issues/2325

Comment 1 Guilherme de Almeida Suckevicz 2021-03-12 17:22:34 UTC

Created glib tracking bugs for this issue:

Affects: epel-7 [bug 1938293]
Affects: fedora-all [bug 1938292]


Created glib2 tracking bugs for this issue:

Affects: fedora-all [bug 1938294]


Created mingw-glib2 tracking bugs for this issue:

Affects: fedora-all [bug 1938295]

Comment 2 Riccardo Schirone 2021-03-15 16:28:16 UTC

Upstream patches:
https://gitlab.gnome.org/GNOME/glib/-/commit/c80528f17ba25ea7d7089946926b93a98bd1479e [2.67.x]
https://gitlab.gnome.org/GNOME/glib/-/commit/01c5468e10707cbf78e6e83bbcf1ce9c866f2885 [2.66.x]

Comment 4 juneau 2021-03-22 15:04:18 UTC

Marking all Hosted* as "notaffected" as this appears to be limited to GNOME which is not present.

Comment 6 errata-xmlrpc 2021-11-09 18:32:48 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2021:4385 https://access.redhat.com/errata/RHSA-2021:4385

Comment 7 Product Security DevOps Team 2021-11-09 19:52:12 UTC

This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):

https://access.redhat.com/security/cve/cve-2021-28153

Comment 8 errata-xmlrpc 2022-11-15 11:09:57 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2022:8418 https://access.redhat.com/errata/RHSA-2022:8418