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Category:   OS (Linux)  >   Linux Kernel Vendors:   kernel.org
Linux Kernel NFSv4 Server Input Validation Flaw in pNFS LAYOUTGET Command Lets Remote Users Cause the Target Service to Crash
SecurityTracker Alert ID:  1038790
SecurityTracker URL:  http://securitytracker.com/id/1038790
CVE Reference:   CVE-2017-8797   (Links to External Site)
Date:  Jun 27 2017
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   A vulnerability was reported in the Linux kernel NFSv4 Server. A remote user can cause the target service to crash.

A remote user on a system within the target mount's host address mask range can send a specially crafted NFSv4 pNFS LAYOUTGET command via UDP to trigger an input validation and array deference error and cause the target service to crash.

Systems compiled with CONFIG_NFSD_PNFS enabled are affected.

Jani Tuovila from Synopsys Ltd reported this vulnerability.

Impact:   A remote user can cause the target service to crash.
Solution:   The vendor has issued a source code fix, available at:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/fs/nfsd?h=v4.12-rc7&id=b550a32e60a4941994b437a8d662432a486235a5
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/fs/nfsd?h=v4.12-rc7&id=f961e3f2acae94b727380c0b74e2d3954d0edf79

Vendor URL:  www.kernel.org/ (Links to External Site)
Cause:   Access control error, Input validation error

Message History:   This archive entry has one or more follow-up message(s) listed below.
Sep 6 2017 (Red Hat Issues Fix) Linux Kernel NFSv4 Server Input Validation Flaw in pNFS LAYOUTGET Command Lets Remote Users Cause the Target Service to Crash
Red Hat has issued a fix for Red Hat Enterprise Linux 6.



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