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Category:   OS (UNIX)  >   OpenBSD Kernel Vendors:   OpenBSD
OpenBSD Integer Overflow in uvm_map_isavail() Lets Local Users Cause Denial of Service Conditions on the Target System
SecurityTracker Alert ID:  1036493
SecurityTracker URL:  http://securitytracker.com/id/1036493
CVE Reference:   GENERIC-MAP-NOMATCH   (Links to External Site)
Date:  Aug 2 2016
Impact:   Denial of service via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  Exploit Included:  Yes  
Version(s): 5.8, 5.9, 6.0
Description:   A vulnerability was reported in OpenBSD. A local user can cause denial of service conditions on the target system.

A local user can invoke a mmap() call requesting a mapping at a virtual address that overlaps with an existing mapping to trigger an integer overflow in uvm_map_isavail() in 'sys/uvm/uvm_map.c' and cause the target system to crash.

Jesse Hertz and Tim Newsham of NCC Group's Project Triforce reported this vulnerability.

Impact:   A local user can cause the target system to crash.
Solution:   The vendor has issued a fix, available at:

http://ftp.openbsd.org/pub/OpenBSD/patches/5.8/common/026_uvmisavail.patch.sig
http://ftp.openbsd.org/pub/OpenBSD/patches/5.9/common/023_uvmisavail.patch.sig
http://ftp.openbsd.org/pub/OpenBSD/patches/6.0/common/001_uvmisavail.patch.sig

Vendor URL:  www.openbsd.org/errata60.html (Links to External Site)
Cause:   Boundary error

Message History:   None.


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