1 KiB
Wildcards Spare tricks
7z
In 7z even using -- before * note that `--` means that the following input cannot treated as parameters, so just file paths in this case you can cause an arbitrary error to read a file, so if a command like the following one is being executed by root:
7za a /backup/$filename.zip -t7z -snl -p$pass -- *
And you can create files in the folder were this is being executed, you could create the file @root.txt and the file root.txt being a symlink to the file you want to read:
cd /path/to/7z/acting/folder
touch @root.txt
ln -s /file/you/want/to/read root.txt
Then, when 7z is execute, it will treat root.txt as a file containing the list of files it should compress thats what the existence of `@root.txt` indicates and when it 7z read root.txt it will read /file/you/want/to/read and as the content of this file isn't a list of files, it will throw and error showing the content.
More info in Write-ups of the box CTF from HackTheBox.
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