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FreeBSD IPsec Sequence Number Verification Bypass
Secunia Advisory: SA19366
Release Date: 2006-03-23
Popularity: 7,835 views

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

OS:FreeBSD 4.x
FreeBSD 5.x
FreeBSD 6.x

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CVE reference:CVE-2006-0905


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

The security issue is caused due to the incorrect update of the sequence number associated with a Security Association in the "fast_ipsec" implementation. This allows certain packets to unconditionally bypass sequence number verification checks.

Successful exploitation allows an attacker to capture IPSec packets and subsequently replay them.

The security issue has been reported in all FreeBSD versions since 4.8-RELEASE.

Solution:
Update FreeBSD or apply patch.

Fixed versions:
2006-03-22 16:01:08 UTC (RELENG_6, 6.1-STABLE)
2006-03-22 16:01:38 UTC (RELENG_6_0, 6.0-RELEASE-p6)
2006-03-22 16:01:56 UTC (RELENG_5, 5.5-STABLE)
2006-03-22 16:02:17 UTC (RELENG_5_4, 5.4-RELEASE-p13)
2006-03-22 16:02:35 UTC (RELENG_5_3, 5.3-RELEASE-p28)
2006-03-22 16:02:49 UTC (RELENG_4, 4.11-STABLE)
2006-03-22 16:03:05 UTC (RELENG_4_11, 4.11-RELEASE-p16)
2006-03-22 16:03:25 UTC (RELENG_4_10, 4.10-RELEASE-p22)

Patch for FreeBSD 4.10, 4.11, 5.3, 5.4, and 6.0:
ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-06:11/ipsec.patch
ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-06:11/ipsec.patch.asc

Provided and/or discovered by:
The vendor credits Pawel Jakub Dawidek.

Original Advisory:
ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-06:11.ipsec.asc


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