Protect against shell-injection attacks #20
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By using `-print0`, filenames to purge are delimited by nuls instead of newlines, which can't be found in filenames on unix. Previously, someone who uploaded a file could inject an *extra set* of files to try to erase. For example, by uploading a file to: "/path/to/dir/file1.png%09/var/log/messages%09/etc/passwd%09/home/user/something.png" I can't take credit for this. This is from @horazont in horazont/xmpp-http-upload#11 (comment)
ThomasLeister
approved these changes
Aug 4, 2020
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Hi @kousu , thanks for your contribution! :-) |
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By using
-print0, filenames to purge are delimited by nuls instead of newlines, which can't be found in filenames on unix. Previously, someone who uploaded a file could inject an extra set of files to try to erase. For example, by uploading a file to:"/path/to/dir/file1.png%09/var/log/messages%09/etc/passwd%09/home/user/something.png"
I can't take credit for this. This is from @horazont in horazont/xmpp-http-upload#11 (comment)