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Category:   Networking Stack (TCP/IP)  >   TCP/IP Stack Implementation Vendors:   OpenBSD
OpenBSD TCP Timestamp Boundary Error Lets Remote Users Panic the System
SecurityTracker Alert ID:  1012861
SecurityTracker URL:  http://securitytracker.com/id/1012861
CVE Reference:   GENERIC-MAP-NOMATCH   (Links to External Site)
Date:  Jan 12 2005
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   A vulnerability was reported in OpenBSD in the tcp(4) stack. A remote user can cause a system panic.

OpenBSD reported that a remote user can send packets with specially crafted values in the TCP timestamp option to cause a system panic on the target system. The panic occurs because the stack permits an invalid argument (rtt less than zero or greater than TCP_RTT_MAX) to be used in calculating the TCP retransmit timeout value.

Impact:   A remote user can cause a system panic on the target system.
Solution:   The following source code patches are available:

ftp://ftp.openbsd.org/pub/OpenBSD/patches/3.5/common/027_rtt.patch
ftp://ftp.openbsd.org/pub/OpenBSD/patches/3.6/common/010_rtt.patch

Vendor URL:  www.openbsd.org/ (Links to External Site)
Cause:   Boundary error
Underlying OS:  UNIX (OpenBSD)
Underlying OS Comments:  OpenBSD 3.5, 3.6

Message History:   None.


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