ELA-598-1 python2.7 security update

multiple vulnerabilities

2022-04-14
Packagepython2.7
Version2.7.9-2-ds1-1+deb8u9
Related CVEs CVE-2019-16935 CVE-2021-3177 CVE-2021-4189

Multiple vulnerabilities were found in src:python2.7, the Python interpreter.

CVE-2019-16935

The documentation XML-RPC server in Python has XSS via the server_title
field. This occurs in Lib/DocXMLRPCServer.py. If set_server_title is called
with untrusted input, arbitrary JavaScript can be delivered to clients that
visit the http URL for this server.

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.

For Debian 8 jessie, these problems have been fixed in version 2.7.9-2-ds1-1+deb8u9.

We recommend that you upgrade your python2.7 packages.

Further information about Extended LTS security advisories can be found at: https://deb.freexian.com/extended-lts/