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Category:   OS (Linux)  >   Linux Kernel Vendors:   kernel.org
Linux Kernel Extended BPF Verifier Stack Pointer Calculation Flaw Lets Local Users Gain Elevated Privileges
SecurityTracker Alert ID:  1040058
SecurityTracker URL:  http://securitytracker.com/id/1040058
CVE Reference:   CVE-2017-17863   (Links to External Site)
Date:  Dec 26 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  
Version(s): 4.9.x
Description:   A vulnerability was reported in the Linux kernel. A local user can obtain elevated privileges on the target system.

The Extended BPF verifier ('kernel/bpf/verifier.c') does not properly evaluate stack frame pointers. A local user can run a specially crafted application to trigger an integer overflow or memory access error to execute arbitrary code on the target system with elevated privileges.

Jann Horn reported this vulnerability.

Impact:   A local user can obtain elevated privileges on the target system.
Solution:   A proposed source code fix is available at:

https://anonscm.debian.org/cgit/kernel/linux.git/tree/debian/patches/bugfix/all/bpf-reject-out-of-bounds-stack-pointer-calculation.patch?h=stretch-security

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

Message History:   This archive entry has one or more follow-up message(s) listed below.
Jan 10 2018 (Ubuntu Issues Fix) Linux Kernel Extended BPF Verifier Stack Pointer Calculation Flaw Lets Local Users Gain Elevated Privileges
Ubuntu has issued a fix for Ubuntu Linux 17.10.



 Source Message Contents



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