Bug 1610110 (CVE-2018-14617)

Summary:	CVE-2018-14617 kernel: NULL pointer dereference in fs/hfsplus/dir.c:hfsplus_lookup() when operating on a file in a crafted hfs+ image
Product:	[Other] Security Response	Reporter:	Sam Fowler <sfowler>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	abhgupta, airlied, aquini, bhu, blc, bskeggs, dbaker, dhoward, esammons, ewk, fhrbata, hdegoede, hkrzesin, hwkernel-mgr, iboverma, ichavero, itamar, jarodwilson, jforbes, jglisse, jkacur, john.j5live, jokerman, jonathan, josef, jross, jwboyer, kernel-maint, kernel-mgr, labbott, lgoncalv, linville, lwang, matt, mchehab, mcressma, mguzik, mjg59, mlangsdo, nmurray, plougher, rt-maint, rvrbovsk, skozina, slawomir, steved, sthangav, trankin, vdronov, williams
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:	An issue was discovered in the Linux kernel. A NULL pointer dereference and panic in hfsplus_lookup() in the fs/hfsplus/dir.c function can occur when opening a file (that is purportedly a hard link) in an hfs+ filesystem that has malformed catalog data, and is mounted read-only without a metadata directory.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2018-08-02 16:03:27 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:	1610112, 1611687
Bug Blocks:	1610113

Description Sam Fowler 2018-07-31 01:55:35 UTC

An issue was discovered in the Linux kernel. There is a NULL pointer dereference and panic in hfsplus_lookup() in fs/hfsplus/dir.c when opening a file (that is purportedly a hard link) in an hfs+ filesystem that has malformed catalog data, and is mounted read-only without a metadata directory.

References:

https://bugzilla.kernel.org/show_bug.cgi?id=200297

A suggested upstream patch:

https://www.spinics.net/lists/linux-fsdevel/msg130021.html

Comment 3 Vladis Dronov 2018-08-02 15:58:56 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1611687]

Comment 4 Vladis Dronov 2018-08-02 16:01:44 UTC

Note:

An HFS+ filesystem is not built for any Red Hat products except for Red Hat Enterprise Linux 5, which is no longer in development and is in Extended Life Phase (https://access.redhat.com/support/policy/updates/errata/#Extended_Life_Cycle_Phase).

Comment 5 Wade Mealing 2018-08-09 07:50:39 UTC

Mitigation:

If the HFS+ filesystem is not in use, this module can be blacklisted and prevented from being loaded. See https://access.redhat.com/solutions/41278 for instructions on how to blacklist the 'hfsplus.ko' kernel module.