TEST

AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
-- snip snip --

Proof of Concept:
The proof of concept can be found at:  
<http://sightly.net/peter/tmp/mutt-bug> 
http://sightly.net/peter/tmp/mutt-bug.

The last message causes data to be written to addresses bufi[~1300] and 
above, when the size is 1000 (BUFI_SIZE) - this can easily be seen by 
monitoring the counter from gdb or adding printf's. Since this and other 
such experiments cause the propolice canary to get damaged (being right 
next to the return address), it seems very likely for this to be 
exploitable, except on system such as OpenBSD that include ProPolice by 
default.

Possible Fix:
--- handler.c.orig Tue Mar 26 02:49:51 2002
+++ handler.c Wed Aug 10 16:55:02 2005
@@ -95,7 +95,7 @@ static void convert_to_state(iconv_t cd,
     return;
   }
 
- if (cd == (iconv_t)(-1))
+ if (cd == (iconv_t)(-1) || *l >= BUFI_SIZE)
   {
     state_prefix_put (bufi, *l, s);
     *l = 0;


ADDITIONAL INFORMATION

The information has been provided by  <mailto:pvalchev@xxxxxxxxxxx> Peter 
Valchev ,
 <mailto:j@xxxxxxxxxxxx> Frank Denis.



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