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Insecure Library Loading
Moderately critical

FreeBSD "pf" IP Fragment Denial of Service Vulnerability

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Release Date:  2006-01-25    Views:  12,486

Secunia Advisory SA18609

Where:

From remote

Impact:

DoS

Solution Status:

Vendor Patch

Operating System:

CVE Reference(s):

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.

Further details available to Secunia VIM customers

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

Deep Links:
Links available to Secunia VIM customers

Do you have additional information related to this advisory?

Please provide information about patches, mitigating factors, new versions, exploits, faulty patches, links, and other relevant data by posting comments to this Advisory. You can also send this information to vuln@secunia.com

Subject: FreeBSD "pf" IP Fragment Denial of Service Vulnerability

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