Re: Arbitrary code execution in eping plugin

From: Anders Henke (anders_at_schlund.de)
Date: 06/15/05

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    Date: Wed, 15 Jun 2005 10:56:19 +0200
To: Christoph 'knurd' Jeschke <christoph.jeschke@gmail.com>

    Am 14.06.2005 schrieb Christoph 'knurd' Jeschke:
    > Jonathan Angliss schrieb:
    >
    > > Won't match IPv6 addresses, but neither will the original code, and it
    > > matches IP addresses perfectly I believe.
    >
    > My Suggestion for IPv4 is:
    >
    > ^(?!0+\.0+\.0+\.0+$)([01]?\d{1,2}|2[0-2][0-3])\.([01]?\d{1,2}|2[0-4]\d|25[0-5])\.([01]?\d{1,2}|2[0-4]\d|25[0-5])\.([01]?\d{1,2}|2[0-4]\d|25[0-5])$
    >
    > So 0.0.0.0 (Internet) doesn't match, just as 224.0.0.0/4 (Multicast) and
    > 240.0.0.0/4 (Future Use) as described in RFC3330.
    >
    > (based on the Regex from Mastering Regular Expression, Jeffrey E.F. Friedl)
    >
    > Any further suggestions?

    Beware that 0.0.0.1 is also adressable, as the whole /8 has been
    issued for the same thing :-)

    If you wish to use a very complete list of "unlikely" IPv4 adresses,
    you're looking for the bogons list at http://www.cymru.com/Bogons/.

    A short list on "special" IPv4 adresses can be found in RFC 3330;
    so you might also wish to add

    0.0.0.0/8 (RFC1700)
    127.0.0.0/8 (loopback, RFC1700)
    169.254.0.0/16 (LINKLOCAL)
    192.0.2.0/24 (NET-TEST, "for documentation only")
    198.18.0.0/15 (network device testing, see RFC 2544)

    ... and possibly more or less the complete RFC1918-space (10.0.0.0/8,
    172.16.0.0/12, 192.168.0.0/16), too.

    For IPv6, at least

    0000::/8 (loopback)
    FE00::/9 and FF00::/8 (multicast, see RFC3513)
    2001:DB8::/32 ("documentation-only", RFC3849)

    are quite clear to reject.

    Regards,

    Anders 

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