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FreeBSD "pf" IP Fragment Denial of Service Vulnerability
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Secunia Advisory:
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SA18609
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Release Date:
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2006-01-25
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Critical:
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Moderately critical
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Impact:
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DoS
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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 5.x
FreeBSD 6.x
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| | CVE reference: | CVE-2006-0381 (Secunia mirror)
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Description:
A vulnerability has been reported in FreeBSD, which can be exploited by malicious people to cause a DoS (Denial of Service).
The vulnerability is caused due to an error in the "pf" Internet Protocol packet-filter fragment cache when handling IP fragments. This can be exploited to crash the system by sending a specially-crafted sequence of IP packet fragments to the packet filter.
Successful exploitation requires that "pf" is used with a ruleset containing "scrub fragment crop" or "scrub fragment drop-ovl" rules.
The vulnerability has been reported in version 5.3, 5.4, and 6.0.
Solution:
Update FreeBSD or apply patch.
Fixed versions:
2006-01-25 10:00:59 UTC (RELENG_6, 6.0-STABLE)
2006-01-25 10:01:26 UTC (RELENG_6_0, 6.0-RELEASE-p4)
2006-01-25 10:01:47 UTC (RELENG_5, 5.4-STABLE)
2006-01-25 10:02:07 UTC (RELENG_5_4, 5.4-RELEASE-p10)
2006-01-25 10:02:27 UTC (RELENG_5_3, 5.3-RELEASE-p25)
Patch for FreeBSD 5.3, 5.4, and 6.0:
ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-06:07/pf.patch
ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-06:07/pf.patch.asc
Provided and/or discovered by:
The vendor credits Jakob Schlyter and Daniel Hartmeier.
Original Advisory:
ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-06:07.pf.asc
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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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