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Category:   OS (Linux)  >   Linux Kernel Vendors:   kernel.org
Linux Kernel sg_ioctl() Stack Overflow Lets Local Users Cause Denial of Service Conditions on the Target System
SecurityTracker Alert ID:  1038086
SecurityTracker URL:  http://securitytracker.com/id/1038086
CVE Reference:   CVE-2017-7187   (Links to External Site)
Date:  Mar 21 2017
Impact:   Denial of service via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   A vulnerability was reported in the Linux kernel. A local user can cause denial of service conditions on the target system.

A local user can supply a specially crafted command size value to an SG_NEXT_CMD_LEN IOCTL call to trigger a stack overflow and cause denial of service conditions on the target system.

The vulnerability resides in the sg_ioctl() function in 'drivers/scsi/sg.c'.

The original advisory is available at:

https://gist.github.com/dvyukov/48ad14e84de45b0be92b7f0eda20ff1b

Dmitry Vyukov reported this vulnerability.

Impact:   A local user can cause denial of service conditions on the target system.
Solution:   The vendor has issued a source code fix, available at:

https://git.kernel.org/pub/scm/linux/kernel/git/mkp/scsi.git/commit/?h=4.11/scsi-fixes&id=bf33f87dd04c371ea33feb821b60d63d754e3124

Vendor URL:  www.kernel.org/ (Links to External Site)
Cause:   Boundary 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 sg_ioctl() Stack Overflow Lets Local Users Cause Denial of Service Conditions on the Target System
Red Hat has issued a fix for Red Hat Enterprise Linux 6.
Sep 19 2017 (Ubuntu Issues Fix) Linux Kernel sg_ioctl() Stack Overflow Lets Local Users Cause Denial of Service Conditions on the Target System
Ubuntu has issued a fix for Ubuntu Linux 14.04 LTS.



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