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Category:   OS (UNIX)  >   NetBSD Vendors:   NetBSD
NetBSD settimeofday() Lets Certain Local Users Set the Time Backwards
SecurityTracker Alert ID:  1015454
SecurityTracker URL:  http://securitytracker.com/id/1015454
CVE Reference:   GENERIC-MAP-NOMATCH   (Links to External Site)
Date:  Jan 9 2006
Impact:   Modification of system information
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 2.1 and prior
Description:   A vulnerability was reported in NetBSD in the settimeofday() function. A local user with certain permissions can set the time backwards.

A local user with securelevel permissions greater than "1" can invoke settimeofday() to cause the clock time to wrap to "Fri Dec 13 20:45:52 UTC 1901" which then allows the user to set any time value. As a result, the local user can move the time backwards.

The vendor credits Markus Vervier from RedTeam Pentesting with reporting this vulnerability.

Impact:   A local user with securelevel > 1 permissions can set the time backwards.
Solution:   The vendor has issued a kernel fix.

The vendor's advisory is available at:

ftp://ftp.NetBSD.org/pub/NetBSD/security/advisories/NetBSD-SA2006-002.txt.asc

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

Message History:   None.


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