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             AUSCERT External Security Bulletin Redistribution

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

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        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
                      http://marc.info/?l=openbsd-security-announce&m=119196568123812&w=2

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

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

Impact:
    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.

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

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

    ftp://ftp.openbsd.org/pub/OpenBSD/patches/4.2/common/001_dhcpd.patch
    ftp://ftp.openbsd.org/pub/OpenBSD/patches/4.1/common/010_dhcpd.patch
    ftp://ftp.openbsd.org/pub/OpenBSD/patches/4.0/common/016_dhcpd.patch

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


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===========================================================================
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