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Category:   OS (UNIX)  >   TCP/IP Stack Implementation Vendors:   OpenBSD
OpenBSD tcp(4) Bugs in Processing SACK Options Let Remote Users Deny Service
SecurityTracker Alert ID:  1013611
SecurityTracker URL:  http://securitytracker.com/id/1013611
CVE Reference:   GENERIC-MAP-NOMATCH   (Links to External Site)
Date:  Mar 30 2005
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): OpenBSD 3.5, 3.6
Description:   A vulnerability was reported in OpenBSD in the TCP stack implementation. A remote user can cause the system to crash.

A remote user can send TCP packets with invalid SACK options to trigger flaws in the tcp(4) stack on the target system. This may cause all available memory to be consumed or the target system to crash.

The vulnerabilities reside in 'tcp_input.c' and 'tcp_usrreq.c'.

Impact:   A remote user can cause denial of service conditions on the target system, such as memory exhaustion or a crash.
Solution:   The vendor has issued the following patches:

ftp://ftp.openbsd.org/pub/OpenBSD/patches/3.5/common/030_sack.patch
ftp://ftp.openbsd.org/pub/OpenBSD/patches/3.6/common/013_sack.patch

Vendor URL:  www.openbsd.org/ (Links to External Site)
Cause:   Exception handling error, State error

Message History:   None.


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