CVE-2017-9502

In curl before 7.54.1 on Windows and DOS, libcurl’s default protocol
function, which is the logic that allows an application to set which
protocol libcurl should attempt to use when given a URL without a scheme
part, had a flaw that could lead to it overwriting a heap based memory
buffer with seven bytes. If the default protocol is specified to be FILE or
a file: URL lacks two slashes, the given “URL” starts with a drive letter,
and libcurl is built for Windows or DOS, then libcurl would copy the path 7
bytes off, so that the end of the given path would write beyond the malloc
buffer (7 bytes being the length in bytes of the ascii string “file://”).