Re: SunOS 4.1.4 fingerd
Patrick Ferguson (patrick@chloe.dmv.com)
Mon, 20 May 1996 19:22:57 -0400
On Thu May 16 21:37:38 1996 Ed Arnold wrote:
>>andy@fred.net said:
>
>> Just messing around I picked up a couple "logic flaws" with sun 4.1.4
>> fingerd. This may happen on 4.1.X, but I haven't tested, and I am not
>> motivated enough to check :>
>>
>> I know I have seen it written up someplace about the flaw when
>> finger 0@XXX.com is done. (It shows a finger output on every user, which
>> as we know, can be a very useful tool to those with bad intentions)
>>
>> Thus, we just added a user 0 (zero). Problem fixed.
>>
>> Anyway, I have found that fingering .@XXX.com also yeilds the same result.
>
>just fyi, in case you hadn't tried it ... tcpd does a nice job of
>stopping this nonsense.
We use tcpd (tcp-wrappers) to block outside finger connections on a machine, but I
tested it by going to a machine that didn't have wrappers installed and was able to
use the above concatenation (user@hidden@free.machine) to look at the users online.
So I still have to modify the source for the fingers on any machine that won't run
wrappers (like IRIX).
------------------------------------------------------------------------------
Patrick Ferguson - Systems Administrator patrick@dmv.com
DelMarVa OnLine! - Salisbury, MD
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