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Category:   OS (Linux)  >   Linux Kernel Vendors:   kernel.org
Linux Kernel Small Stack Guard Page Lets Local Users Gain Elevated Privileges
SecurityTracker Alert ID:  1038724
SecurityTracker URL:  http://securitytracker.com/id/1038724
CVE Reference:   CVE-2017-1000364   (Links to External Site)
Date:  Jun 20 2017
Impact:   Execution of arbitrary code via local system, Root access via local system, 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.

A local user can trigger a stack memory allocation flaw in certain cases and execute arbitrary code on the target system with elevated privileges.

The kernel's limited stack guard page memory gap can be "jumped" in cases where heap memory and stack memory are adjacent.

The original advisory is available at:

https://www.qualys.com/2017/06/19/stack-clash/stack-clash.txt

Qualys Research Labs reported this vulnerability.

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

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=1be7107fbe18eed3e319a6c3e83c78254b693acb

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.
Jun 20 2017 (Red Hat Issues Fix) Linux Kernel Small Stack Guard Page Lets Local Users Gain Elevated Privileges
Red Hat has issued a fix for Red Hat Enterprise Linux 5, 5.9, 6, 6.4, 6.5, 6.6, 6.7, 7, and 7.2.
Jun 20 2017 (Ubuntu Issues Fix) Linux Kernel Small Stack Guard Page Lets Local Users Gain Elevated Privileges
Ubuntu has issued a fix for Ubuntu Linux 14.04 LTS.
Jun 22 2017 (Ubuntu Issues Fix) Linux Kernel Small Stack Guard Page Lets Local Users Gain Elevated Privileges
Ubuntu has issued a fix for Ubuntu Linux 12.04 ESM.
Aug 2 2017 (McAfee Issues Fix for McAfee Web Gateway) Linux Kernel Small Stack Guard Page Lets Local Users Gain Elevated Privileges
McAfee has issued a fix for McAfee Web Gateway.



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