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             AUSCERT External Security Bulletin Redistribution

                    ESB-2006.0136 -- [Win][UNIX/Linux]
            Honeyd Remote Detection Via Multiple Probe Packets
                             16 February 2006


        AusCERT Security Bulletin Summary

Product:           honeyd prior to 1.5
Operating System:  UNIX variants (UNIX, Linux, OSX)
Impact:            Reduced Security
Access:            Remote/Unauthenticated

Original Bulletin: http://www.honeyd.org/adv.2006-01

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Honeyd Security Advisory 2006-001

Topic:    Remote Detection Via Multiple Probe Packets

Version:  All versions prior to Honeyd 1.5

Severity: Identification of Honeyd installations allows an
          adversary to launch attacks specifically against
          Honeyd.  No remote root exploit is currently known.


Honeyd is a virtual honeypot daemon that can simulate virtual hosts on
unallocated IP addresses.

A bug in the IP reassembly codes causes Honeyd to reply to illegal
fragments that other implementations would silently drop.  Watching
for replies, it is possible to detect IP addresses simulated by


A new version of Honeyd has been released to address this issue.
The source code for Honeyd 1.5 can downloaded from


It is suggested to run Honeyd in a chroot environment under a sandbox
like Systrace.

Existing installations can be fixed with the following patch


Thanks To

Jon Oberheide for finding the problem and providing a fix to avoid

More Information:

More information on Honeyd can be found at


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