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Bug 1610110 - (CVE-2018-14617) CVE-2018-14617 kernel: NULL pointer dereference in fs/hfsplus/dir.c:hfsplus_lookup() when operating on a file in a crafted hfs+ image
CVE-2018-14617 kernel: NULL pointer dereference in fs/hfsplus/dir.c:hfsplus_l...
Status: CLOSED NOTABUG
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
low Severity low
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Assigned To: Red Hat Product Security
impact=low,public=20180627,reported=2...
: Security
Depends On: 1611687 1610112
Blocks: 1610113
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Reported: 2018-07-30 21:55 EDT by Sam Fowler
Modified: 2018-08-20 03:05 EDT (History)
50 users (show)

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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.
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Last Closed: 2018-08-02 12:03:27 EDT
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RHEL 7.3 requirements from Atomic Host:
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Description Sam Fowler 2018-07-30 21:55:35 EDT 
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 11:58:56 EDT 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1611687]
Comment 4 Vladis Dronov 2018-08-02 12:01:44 EDT 
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 03:50:39 EDT 
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.
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