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Bug 1481149 - (CVE-2017-10663) CVE-2017-10663 kernel: Missing sanity check for segno and blkoff read
CVE-2017-10663 kernel: Missing sanity check for segno and blkoff read
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=20170512,reported=2...
: Security
Depends On: 1481153
Blocks: 1481154
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Reported: 2017-08-14 04:39 EDT by Adam Mariš
Modified: 2018-01-29 11:30 EST (History)
37 users (show)

See Also:
Fixed In Version:
Doc Type: Bug Fix
Doc Text:
The sanity_check_ckpt function in fs/f2fs/super.c in the Linux kernel before version 4.12.4 does not validate the blkoff and segno arrays. This allows an unprivileged, local user to cause a system panic and DoS. Due to the nature of the flaw, privilege escalation cannot be fully ruled out, although we believe it is unlikely.
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Last Closed: 2017-08-27 11:39:55 EDT
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RHEL 7.3 requirements from Atomic Host:
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Description Adam Mariš 2017-08-14 04:39:08 EDT 
The sanity_check_ckpt function in fs/f2fs/super.c in the Linux kernel before 4.12.4 does not validate the blkoff and segno arrays, which allows an unprivileged local user to cause a system panic and DoS. Due to the nature of the flaw, privilege escalation cannot be fully ruled out, although we believe it is unlikely.

References:

https://source.android.com/security/bulletin/2017-08-01#kernel-components

https://sourceforge.net/p/linux-f2fs/mailman/message/35835945/

Upstream patch:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=15d3042a937c13f5d9244241c7a9c8416ff6e82a
Comment 1 Adam Mariš 2017-08-14 04:47:18 EDT 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1481153]
Comment 4 Vladis Dronov 2017-08-27 11:39:55 EDT 
Statement:

This issue does not affect the versions of the Linux kernel as shipped with Red Hat Enterprise Linux 5, 6, 7 and Red Hat Enterprise MRG 2 as the code with the flaw is not built and shipped with the products listed.
Comment 5 Justin M. Forbes 2018-01-29 11:30:32 EST 
This was fixed for Fedora with the 4.12.4 stable updates
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