full-disclosure - Mercury/32 4.01b

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Date: Tue, 06 Mar 2007 15:41:25 +0000
From: mu-b <mu-b@...it-labs.org>
To: full-disclosure@...ts.grok.org.uk
Subject: Mercury/32 4.01b

Attached is a remote exploit (disarmed PoC) for Mercury/32 4.01b IMAPD.
The vulnerability is located in the call:-
034646AE call    sub_346ECD9
which is passes (as third argument) the number of bytes remaining in a
stack buffer in order to construct the complete command from the
continuation data. However the calculation neglects to take into account
the length of the previously supplied command ("1 LOGIN <900 x '\x20'> {255}").

The result of the attached exploit is a DoS (given below), however, remote code
execution is possible in at least two different ways without authentication...

(b24.a70): Access violation - code c0000005 (first chance)
First chance exceptions are reported before any exception handling.
This exception may be expected and handled.
eax=0456d70c ebx=41414141 ecx=7ffad000 edx=034a2970 esi=00000500 edi=00000000
eip=00441d88 esp=0456d6dc ebp=0456d6ec iopl=0         nv up ei pl zr na pe nc
cs=001b  ss=0023  ds=0023  es=0023  fs=003b  gs=0000             efl=00010246
mercuryi!miconfig_proc_3+0xbacd:
0346ed48 8807            mov     byte ptr [edi],al          ds:0023:04570000=??

(note this may be the same as BID 21110).
-- 
mu-b
(mu-b@...it-labs.org)

  "Only a few people will follow the proof. Whoever does will
     spend the rest of his life convincing people it is correct."
        - Anonymous, "P ?= NP"

View attachment "mercurypown-v1.pl" of type "text/x-perl" (2072 bytes)

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