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Category:   OS (UNIX)  >   OpenBSD Kernel Vendors:   OpenBSD
(OpenBSD Issues Fix for 3.0) Re: OpenBSD Kernel Bug in 'setitimer' May Allow A Local User to Write to Kernel Memory
SecurityTracker Alert ID:  1005373
SecurityTracker URL:
CVE Reference:   GENERIC-MAP-NOMATCH   (Links to External Site)
Date:  Oct 8 2002
Impact:   Denial of service via local system, Execution of arbitrary code via local system, Root access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   A vulnerability was reported in the 'setitime(2)' OpenBSD kernel function. A local user may be able to execute arbitrary code with kernel privileges.

It is reported that that the setitimer(2) interval timer system call does not properly check user-supplied arguments. A local user may be able to write to kernel memory. No further details were provided.

Impact:   A local user can write to kernel memory.
Solution:   The vendor has released a source code patch for OpenBSD 3.0, available at:

For the 3.1 patch, see the Message History for a previously issued alert.

Vendor URL: (Links to External Site)
Cause:   Input validation error

Message History:   This archive entry is a follow-up to the message listed below.
Oct 3 2002 OpenBSD Kernel Bug in 'setitimer' May Allow A Local User to Write to Kernel Memory

 Source Message Contents

Subject:  OpenBSD patch

# 032: SECURITY FIX: October 7, 2002

Incorrect argument checking in the setitimer(2) system call may allow an attacker to write
to kernel memory.

A source code patch exists which remedies the problem:


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