set_file_metadata in xattr.c in GNU Wget prior to 1.20.1 stores a file's origin URL in the user.xdg.origin.url metadata attribute of the extended attributes of the downloaded file, which allows local users to obtain sensitive information (e.g., credentials contained in the URL) by reading this attribute, as demonstrated by getfattr. This also applies to Referer information in the user.xdg.referrer.url metadata attribute. According to 2016-07-22 in the Wget ChangeLog, user.xdg.origin.url was partially based on the behavior of fwrite_xattr in tool_xattr.c in curl.
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gnu wget |
New year, new CVE
Happy New Year! Oh, and if you include GNU's wget utility in software you write, pull down the new version released on Boxing Day and push out updates to your users. The popular utility retrieves internet-hosted HTTP/HTTPS and FTP/FTPS content and some years ago began storing extended attributes on disk as URIs. On Christmas Day, security researcher Gynvael Coldwind (@gynvael) noted on Twitter that the stored attributes can include user credentials: Though only stored locally, user IDs and passw...
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