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FreeBSD IPsec Sequence Number Verification Bypass
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Secunia Advisory:
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SA19366
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Release Date:
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2006-03-23
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Popularity:
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7,835 views
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Critical:
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Moderately critical
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Impact:
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Security Bypass
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Where:
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From remote
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Solution Status:
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Vendor Patch
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| OS: | FreeBSD 4.x
FreeBSD 5.x
FreeBSD 6.x
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Subscribe:
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Instant alerts on relevant vulnerabilities 
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| | CVE reference: | CVE-2006-0905
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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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About this Secunia Advisory
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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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7th Jan, 2009
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