full-disclosure - basic exploit coding on solaris sparc

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Message-ID: <20041021100222.GA1635@beastie.guard-info.com>
From: meder at areopag.net (Meder Kydyraliev)
Subject: basic exploit coding on solaris sparc

check out this one: http://66.230.171.10/papers/UNF-sparc-overflow.txt

On Wed, Oct 20, 2004 at 11:16:42PM -0600, Fabio wrote:
> Hi.
> 
> I am trying to learn Solaris Sparc assembly and how exploits works on 
> this architecture. I have a setuid root binary that has the following bug:
> 
> #include <sys/stat.h>
> #include <stdio.h>
> #include <string.h>
> #include <stdlib.h>
> 
> main(int argc,char *argv[])
> {
> char buffer[40];
> char buffarg[20];
> char *mailpath;
>       strcpy(buffer,"/var/mail/");
>       if (argc == 2)
>       {
>               strcpy(buffarg,argv[1]);
>               mailpath=strcat(buffer,buffarg);
>               printf("\nRemoving: %s\n",mailpath);
>               if(!unlink(mailpath))
>               {
>                       printf("Mailbox: %s  delete\n\n", mailpath);
> 
>               }
>         }
> }
> 
> I found this shellcode (120 bytes long)
> 
> http://shellcode.org/Shellcode/Solaris/solaris-sparc-shellcode.html
> 
> the behavoir is the following:
> 
> nietzsche% ./b `perl -e 'print "A" x 1000'`
> Segmentation fault (core dumped)
> nietzsche% ./b `perl -e 'print "A" x 24'`
> Segmentation fault (core dumped)
> 
> The less value without core dump is 23.
> 
> I am interested in code a exploit that execute a root shell, on 
> 'smashing the stack' article they refer to Linux and x86, so I cant see 
> information about sparc and register windowing.
> 
> Anyone can help me to reproduce a exploit for the sample provided?
> 
> Thanks in advance.
> 
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