full-disclosure - mydns-1.1.0 remote heap overflow

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Date: Fri, 27 Apr 2007 09:45:25 +0100
From: mu-b <mu-b@...it-labs.org>
To: full-disclosure@...ts.grok.org.uk
Subject: mydns-1.1.0 remote heap overflow

The attached PoC causes a remote heap smash in mydns 1.1.0, the bug is found
within the dynamic update code (update.c). Exploitation requires update privs
(which tends not to matter too much if you know an IP address with
privileges to do so), also allow-update = yes must be set in /etc/mydns.conf.
The attached patch also fixes a stack based off-by-one overflow in update.c.

Example :-
0xb7f27410 in __kernel_vsyscall
    ()
(gdb) c
Continuing.

Program received signal SIGSEGV, Segmentation fault.
0x0805d0e2 in ?? ()
(gdb) x/i $eip
0x805d0e2 <strcpy@...+73534>:   rep movsb %ds:(%esi),%es:(%edi)

PoC: http://www.digit-labs.org/files/exploits/mydns-rr-smash.c
Patch: http://www.digit-labs.org/files/patches/mydns-update.c.diff
-- 
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"

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