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[3.9] bpo-43285 Make ftplib not trust the PASV response. (GH-24838)#24880
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bpo-43285: Make ftplib not trust the PASV response.The IPv4 address value returned from the server in response to the PASV commandshould not be trusted. This prevents a malicious FTP server from using theresponse to probe IPv4 address and port combinations on the client network.Instead of using the returned address, we use the IP address we'realready connected to. This is the strategy other ftp clients adopted,and matches the only strategy available for the modern IPv6 EPSV commandwhere the server response must return a port number and nothing else.For the rare user who _wants_ this ugly behavior, set a `trust_server_pasv_ipv4_address`attribute on your `ftplib.FTP` instance to True.(cherry picked from commit0ab152c)Co-authored-by: Gregory P. Smith <greg@krypto.org>
@gpshead: Status check is done, and it's a success ✅ . |
gpshead approved these changesMar 15, 2021
@gpshead: Status check is done, and it's a success ✅ . |
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bpo-43285: Make ftplib not trust the PASV response.
The IPv4 address value returned from the server in response to the PASV command
should not be trusted. This prevents a malicious FTP server from using the
response to probe IPv4 address and port combinations on the client network.
Instead of using the returned address, we use the IP address we're
already connected to. This is the strategy other ftp clients adopted,
and matches the only strategy available for the modern IPv6 EPSV command
where the server response must return a port number and nothing else.
For the rare user whowants this ugly behavior, set a
trust_server_pasv_ipv4_addressattribute on your
ftplib.FTPinstance to True.(cherry picked from commit0ab152c)
Co-authored-by: Gregory P. Smithgreg@krypto.org
https://bugs.python.org/issue43285
Automerge-Triggered-By: GH:gpshead