Debian Stretch: DLA-2919-1 Critical: Python2.7 Buffer Overflow and FTP Flaw

CVE-2021-3177

Python has a buffer overflow in PyCArg_repr in _ctypes/callproc.c, which may
lead to remote code execution in certain Python applications that accept
floating-point numbers as untrusted input.

CVE-2021-4189

A flaw was found in Python, specifically in the FTP (File Transfer Protocol)
client library when using it in PASV (passive) mode. The flaw lies in how
the FTP client trusts the host from PASV response by default. An attacker
could use this flaw to setup a malicious FTP server that can trick FTP
clients into connecting back to a given IP address and port. This could lead
to FTP client scanning ports which otherwise would not have been possible.
.
Instead of using the returned address, ftplib now uses the IP address we're
already connected to. For the rare user who wants an old behavior, set a
`trust_server_pasv_ipv4_address` attribute on your `ftplib.FTP` instance to
True.