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OpenBSD isakmpd IPSec Sequence Number Verification Bypass Advisory Available in Danish 

Secunia Advisory: SA21652  
Release Date: 2006-08-28
Last Update: 2006-08-29

Critical:
Moderately critical
Impact: Security Bypass
Where: From remote
Solution Status: Vendor Patch

OS:OpenBSD 3.x


CVE reference:CVE-2006-4436 (Secunia mirror)

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Description:
A security issue has been reported in OpenBSD, which can be exploited by malicious people to bypass certain security restrictions.

The security issue is caused due to isakmpd creating a replay window of size 0 when responding to SA negotiations, which can be exploited by an attacker to capture IPSec packets and subsequently replay them.

Solution:
Apply patches.

OpenBSD 3.9:
ftp://ftp.openbsd.org/pub/OpenBSD/patches/3.9/common/008_isakmpd.patch

OpenBSD 3.8:
ftp://ftp.openbsd.org/pub/OpenBSD/patches/3.8/common/013_isakmpd.patch

Provided and/or discovered by:
Reported by the vendor.

Changelog:
2006-08-29: Added CVE reference.

Original Advisory:
http://www.openbsd.org/errata.html



Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.

Secunia collects, validates, and verifies all vulnerability reports issued by security research groups, vendors, and others.

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