Mandriva Linux Security Advisory 2010-167 - lwp-download in libwww-perl before 5.835 does not reject downloads to filenames that begin with a. character, which allows remote servers to create or overwrite files via a 3xx redirect to a URL with a crafted filename or a Content-Disposition header that suggests a crafted filename, and possibly execute arbitrary code as a consequence of writing to a dotfile in a home directory.
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