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Category:   OS (Linux)  >   Linux Kernel Vendors:   kernel.org
Linux Kernel Kerberos RxRPC Ticket Decoding Bug Lets Local Users Gain Elevated Privileges
SecurityTracker Alert ID:  1038787
SecurityTracker URL:  http://securitytracker.com/id/1038787
CVE Reference:   CVE-2017-7482   (Links to External Site)
Date:  Jun 26 2017
Impact:   Execution of arbitrary code 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 create a specially crafted Kerberos 5 ticket that, when decoded by the target system to be loaded into a RxRPC key, will trigger a buffer overflow and potentially execute arbitrary code on the target system with elevated privileges.

Shi Lei, Qihoo 360 Inc., 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=5f2f97656ada8d811d3c1bef503ced266fcd53a0

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.
Aug 4 2017 (Ubuntu Issues Fix) Linux Kernel Kerberos RxRPC Ticket Decoding Bug Lets Local Users Gain Elevated Privileges
Ubuntu has issued a fix for Ubuntu Linux 16.04 LTS.
Aug 4 2017 (Ubuntu Issues Fix) Linux Kernel Kerberos RxRPC Ticket Decoding Bug Lets Local Users Gain Elevated Privileges
Ubuntu has issued a fix for Ubuntu Linux 17.04.
Aug 8 2017 (Ubuntu Issues Fix) Linux Kernel Kerberos RxRPC Ticket Decoding Bug Lets Local Users Gain Elevated Privileges
Ubuntu has issued a fix for Ubuntu Linux 14.04 LTS.



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