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Apple OS X DYLD_PRINT_TO_FILE Privilege Escalation

In Apple OS X 10.10.4 and prior, the DYLD_PRINT_TO_FILE environment variable is used for redirecting logging data to a file instead of stderr. Due to a design error, this feature can be abused by a local attacker to write arbitrary files as root via restricted, SUID-root binaries.

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Module Name

exploit/osx/local/dyld_print_to_file_root

Authors

  • Stefan Esser
  • joev <joev [at] metasploit.com>

References

Targets

  • Mac OS X 10.10-10.10.4

Platforms

  • osx

Architectures

  • x64

Reliability

Development

Module Options

To display the available options, load the module within the Metasploit console and run the commands 'show options' or 'show advanced':

msf > use exploit/osx/local/dyld_print_to_file_root msf exploit(dyld_print_to_file_root) > show targets ...targets... msf exploit(dyld_print_to_file_root) > set TARGET <target-id> msf exploit(dyld_print_to_file_root) > show options ...show and set options... msf exploit(dyld_print_to_file_root) > exploit