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             AUSCERT External Security Bulletin Redistribution

                        ESB-2007.0767 -- [OpenBSD]
                  Buffer Overflow in OpenBSD dhcpd server
                              12 October 2007


        AusCERT Security Bulletin Summary

Product:              dhcpd
Operating System:     OpenBSD
Impact:               Execute Arbitrary Code/Commands
                      Denial of Service
Access:               Remote/Unauthenticated
CVE Names:            CVE-2007-5365

Original Bulletin:    http://www.openbsd.org/errata42.html

Comment: This vulnerability appears to only exist in the OpenBSD version of
         dhcpd. The ISC sourse code, as well as FreeBSD and NetBSD, do not
         appear to be vulnerable.

Revision History:     October 12 2007: Added CVE
                      October 10 2007: Initial Release

- --------------------------BEGIN INCLUDED TEXT--------------------

    Malicious DHCP clients on the local network could cause dhcpd(8)
    to corrupt its stack.

    A DHCP client with a carefully chosen maximum message size that
    is less than the minimum IP MTU could lead to a buffer overflow
    in dhcpd(8).  This could cause dhcpd(8) to crash or could
    potentially result in remote code execution.

    Disable dhcpd if it is enabled.  Note that OpenBSD does not
    ship with dhcpd(8) enabled by default.

    A fix has been committed to OpenBSD-current.  Patches are
    available for OpenBSD 4.2, 4.1 and 4.0.


    The bug was found by Nahuel Riva and Gerardo Richarte of Core
    Security Technologies

- --------------------------END INCLUDED TEXT--------------------

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