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Category:   OS (Linux)  >   Linux Kernel Vendors:   kernel.org
Linux Kernel 'tmpfs' File System Permission Flaw Lets Local Users Gain Elevated Privileges
SecurityTracker Alert ID:  1038053
SecurityTracker URL:  http://securitytracker.com/id/1038053
CVE Reference:   CVE-2017-5551   (Links to External Site)
Date:  Mar 16 2017
Impact:   Modification of system information, User access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   A vulnerability was reported in the Linux kernel. A local user can obtain elevated privileges on the target system.

On systems with the 'tmpfs' file system, the set group id (setgid) bit is not properly cleared during a setxattr call. A local user can exploit this to change permissions on a file and gain elevated privileges on the target system.

Impact:   A local user can obtain elevated privileges on the target system.
Solution:   The vendor has issued a source code fix [in January 2017], available at:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=497de07d89c1410d76a15bec2bb41f24a2a89f31

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

Message History:   This archive entry has one or more follow-up message(s) listed below.
Mar 16 2017 (Ubuntu Issues Fix) Linux Kernel 'tmpfs' File System Permission Flaw Lets Local Users Gain Elevated Privileges
Ubuntu has issued a fix for Ubuntu Linux 16.04 LTS.



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