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FreeBSD "pf" IP Fragment Denial of Service Vulnerability Advisory Available in Danish 

Secunia Advisory: SA18609  
Release Date: 2006-01-25

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

OS:FreeBSD 5.x
FreeBSD 6.x


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



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.

105 Related Secunia Security Advisories, displaying 10

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4. FreeBSD ppp Buffer Overflow Vulnerability
5. FreeBSD update for ipsec
6. FreeBSD "sendfile" Information Disclosure Security Issue
7. FreeBSD pty Snooping Vulnerabilities
8. FreeBSD "inet_network()" Off-By-One Vulnerability
9. FreeBSD sys_dev_random Random Data Replay Vulnerability
10. FreeBSD update for gtar

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