Re: cisco/ascend snmp config tool or exploit? -- Re: snmp

From: Michal Zalewski (lcamtufat_private)
Date: Sun Feb 20 2000 - 11:11:23 PST

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    Hmm, to keep you busy, here's brute-force spoofing scanner for writable
    snmp communities. Requires NetCat and snmp tools (like snmpget) to be
    installed. Scanning is mostly harmless - it tries to change
    system.sysContact.0 to 'null' using common default communities (according
    to securityfocus). Should be run as root.
    
    In addition to list of machines given in initial post, it is known to
    break some Cisco systems (but not recent IOSes, at least not in default
    configuration), most of 3com products (there was another writable
    community, which seems to be present everywhere, regardless of 'private',
    which is disabled by administrators sometimes), HP switches, printers,
    Ascend *DSL modems etc. Also, it should bypass most of stupid source IP
    address restrictions for accessing the community.
    
    Please use this tool to scan your network only.
    
    _______________________________________________________
    Michal Zalewski * [lcamtufat_private] <=> [AGS WAN SYSADM]
    [dione.ids.pl SYSADM] <-> [http://lcamtuf.na.export.pl]
    [+48 22 551 45 93] [+48 603 110 160] bash$ :(){ :|:&};:
    =-----=> God is real, unless declared integer. <=-----=
    
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