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• File read
• SUID
• Sudo

The read file content is corrupted by replacing occurrences of $'\b_' to terminal sequences and by converting tabs to spaces.

File read

It reads data from files, it may be used to do privileged reads or disclose files outside a restricted file system.

• Usecase:

  LFILE=file_to_read
  ul "$LFILE"

• Privileges required:
• OS:
• Mitre:

SUID

It runs with the SUID bit set and may be exploited to access the file system, escalate or maintain access with elevated privileges working as a SUID backdoor. If it is used to run sh -p, omit the -p argument on systems like Debian that allow the default sh shell to run with SUID privileges.

• Usecase:

  LFILE=file_to_read
  ./ul "$LFILE"

• Privileges required:
• OS:
• Mitre:

Sudo

It runs in privileged context and may be used to access the file system, escalate or maintain access with elevated privileges if enabled on sudo.

• Usecase:

  LFILE=file_to_read
  sudo ul "$LFILE"

• Privileges required:
• OS:
• Mitre: