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bpo-43285 Make ftplib not trust the PASV response.#24838
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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.
gpshead
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type-bug
An unexpected behavior, bug, or error
needs backport to 3.6
type-security
A security issue
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Mar 13, 2021
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Mar 13, 2021
`trust_server_pasv_ipv4_address`
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Thanks @gpshead for the PR 🌮🎉.. I'm working now to backport this PR to: 3.6, 3.7, 3.8, 3.9. |
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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 who _wants_ this ugly behavior, set a `trust_server_pasv_ipv4_address` attribute on your `ftplib.FTP` instance to True. (cherry picked from commit 0ab152c) Co-authored-by: Gregory P. Smith <greg@krypto.org>
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Sorry, @gpshead, I could not cleanly backport this to |
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Sorry @gpshead, I had trouble checking out the |
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Sorry, @gpshead, I could not cleanly backport this to |
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Mar 15, 2021
) 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 who _wants_ this ugly behavior, set a `trust_server_pasv_ipv4_address` attribute on your `ftplib.FTP` instance to True.. (cherry picked from commit 0ab152c) Co-authored-by: Gregory P. Smith <greg@krypto.org>
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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 who _wants_ this ugly behavior, set a `trust_server_pasv_ipv4_address` attribute on your `ftplib.FTP` instance to True. (cherry picked from commit 0ab152c) Co-authored-by: Gregory P. Smith <greg@krypto.org>
gpshead
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Mar 15, 2021
…H-24881) 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 who _wants_ this ugly behavior, set a `trust_server_pasv_ipv4_address` attribute on your `ftplib.FTP` instance to True.. (cherry picked from commit 0ab152c) Co-authored-by: Gregory P. Smith <greg@krypto.org>
miss-islington
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Mar 15, 2021
) (pythonGH-24881) 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 who _wants_ this ugly behavior, set a `trust_server_pasv_ipv4_address` attribute on your `ftplib.FTP` instance to True.. (cherry picked from commit 0ab152c) Co-authored-by: Gregory P. Smith <greg@krypto.org> (cherry picked from commit 664d1d1) Co-authored-by: Gregory P. Smith <greg@krypto.org>
miss-islington
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Mar 15, 2021
) (pythonGH-24881) 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 who _wants_ this ugly behavior, set a `trust_server_pasv_ipv4_address` attribute on your `ftplib.FTP` instance to True.. (cherry picked from commit 0ab152c) Co-authored-by: Gregory P. Smith <greg@krypto.org> (cherry picked from commit 664d1d1) Co-authored-by: Gregory P. Smith <greg@krypto.org>
ned-deily
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…H-24881) (GH-24882) 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 who _wants_ this ugly behavior, set a `trust_server_pasv_ipv4_address` attribute on your `ftplib.FTP` instance to True.. (cherry picked from commit 0ab152c) Co-authored-by: Gregory P. Smith <greg@krypto.org> (cherry picked from commit 664d1d1)
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…H-24881) (GH-24883) 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 who _wants_ this ugly behavior, set a `trust_server_pasv_ipv4_address` attribute on your `ftplib.FTP` instance to True.. (cherry picked from commit 0ab152c) Co-authored-by: Gregory P. Smith <greg@krypto.org> (cherry picked from commit 664d1d1)
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) (pythonGH-24881) (pythonGH-24882) 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 who _wants_ this ugly behavior, set a `trust_server_pasv_ipv4_address` attribute on your `ftplib.FTP` instance to True.. (cherry picked from commit 0ab152c) Co-authored-by: Gregory P. Smith <greg@krypto.org> (cherry picked from commit 664d1d1) Rebased for Python 2.7 by Michał Górny <mgorny@gentoo.org>
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[3.6] bpo-43285 Make ftplib not trust the PASV response. (pythonGH-24838) (G… …H-24881) (pythonGH-24882) 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 who _wants_ this ugly behavior, set a `trust_server_pasv_ipv4_address` attribute on your `ftplib.FTP` instance to True.. (cherry picked from commit 0ab152c) Co-authored-by: Gregory P. Smith <greg@krypto.org> (cherry picked from commit 664d1d1)
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[3.6] bpo-43285 Make ftplib not trust the PASV response. (pythonGH-24838) (G… …H-24881) (pythonGH-24882) 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 who _wants_ this ugly behavior, set a `trust_server_pasv_ipv4_address` attribute on your `ftplib.FTP` instance to True.. (cherry picked from commit 0ab152c) Co-authored-by: Gregory P. Smith <greg@krypto.org> (cherry picked from commit 664d1d1)
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[3.6] bpo-43285 Make ftplib not trust the PASV response. (pythonGH-24838) (G… …H-24881) (pythonGH-24882) 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 who _wants_ this ugly behavior, set a `trust_server_pasv_ipv4_address` attribute on your `ftplib.FTP` instance to True.. (cherry picked from commit 0ab152c) Co-authored-by: Gregory P. Smith <greg@krypto.org> (cherry picked from commit 664d1d1)
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[3.6] bpo-43285 Make ftplib not trust the PASV response. (pythonGH-24838) (G… …H-24881) (pythonGH-24882) 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 who _wants_ this ugly behavior, set a `trust_server_pasv_ipv4_address` attribute on your `ftplib.FTP` instance to True.. (cherry picked from commit 0ab152c) Co-authored-by: Gregory P. Smith <greg@krypto.org> (cherry picked from commit 664d1d1)
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[3.6] bpo-43285 Make ftplib not trust the PASV response. (pythonGH-24838) (G… …H-24881) (pythonGH-24882) 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 who _wants_ this ugly behavior, set a `trust_server_pasv_ipv4_address` attribute on your `ftplib.FTP` instance to True.. (cherry picked from commit 0ab152c) Co-authored-by: Gregory P. Smith <greg@krypto.org> (cherry picked from commit 664d1d1)
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[3.6] bpo-43285 Make ftplib not trust the PASV response. (pythonGH-24838) (G… …H-24881) (pythonGH-24882) 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 who _wants_ this ugly behavior, set a `trust_server_pasv_ipv4_address` attribute on your `ftplib.FTP` instance to True.. (cherry picked from commit 0ab152c) Co-authored-by: Gregory P. Smith <greg@krypto.org> (cherry picked from commit 664d1d1)
icanhasmath
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[3.6] bpo-43285 Make ftplib not trust the PASV response. (pythonGH-24838) (G… …H-24881) (pythonGH-24882) 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 who _wants_ this ugly behavior, set a `trust_server_pasv_ipv4_address` attribute on your `ftplib.FTP` instance to True.. (cherry picked from commit 0ab152c) Co-authored-by: Gregory P. Smith <greg@krypto.org> (cherry picked from commit 664d1d1)
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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.
https://bugs.python.org/issue43285