- -------------------------------------------------------------------------
Debian LTS Advisory DLA-2919-1                debian-lts@lists.debian.org
https://www.debian.org/lts/security/                         Anton Gladky
February 12, 2022                             https://wiki.debian.org/LTS
- -------------------------------------------------------------------------

Package        : python2.7
Version        : 2.7.13-2+deb9u6
CVE ID         : CVE-2021-3177 CVE-2021-4189

Two issues have been discovered in python2.7:

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 9 stretch, these problems have been fixed in version
2.7.13-2+deb9u6.

We recommend that you upgrade your python2.7 packages.

For the detailed security status of python2.7 please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/source-package/python2.7

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://wiki.debian.org/LTS

Debian LTS: DLA-2919-1: python2.7 security update

February 12, 2022
Two issues have been discovered in python2.7: CVE-2021-3177

Summary

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 9 stretch, these problems have been fixed in version
2.7.13-2+deb9u6.

We recommend that you upgrade your python2.7 packages.

For the detailed security status of python2.7 please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/source-package/python2.7

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://wiki.debian.org/LTS


Severity
Package : python2.7
Version : 2.7.13-2+deb9u6
CVE ID : CVE-2021-3177 CVE-2021-4189

Related News

23.Tablet Connections Esm H320
2 - 3 min read
The release of Ubuntu 24.04 LTS , also known as Noble Numbat, brings various security enhancements and exciting new features . These improvements
4.Lock AbstractDigital Esm H320
2 - 3 min read
Tails 6.2 is a new Linux distribution release that expands its multilingual support and improves security features. The distribution is a
19.Laptop Bed Esm H320
2 - 3 min read
AlmaLinux 9.4 beta has been released and provides compelling reasons to consider it for desktop usage. While AlmaLinux is primarily known as a
32.Lock Code Circular Esm H320
2 - 3 min read
Linux admins and security practitioners face significant challenges in keeping their Linux systems secure amidst the constant threat of kernel bugs.
1.Penguin Landscape Esm H320
2 - 3 min read
A significant security threat, known as the Spectre v2 exploit, has been observed targeting Linux systems running on modern Intel processors. Let's
10.FingerPrint Locks Esm H320
2 - 3 min read
The recent release of I2P 2.5.0 , an anonymous P2P network that protects against online censorship, surveillance, and monitoring, has brought a slew
24.Key Code Esm H320
2 - 3 min read
The Akira ransomware group has extorted approximately $42 million from over 250 victims since January 1, 2024. The group initially focused on
5.ShakingHands Esm H320
2 - 3 min read
At The Linux Foundation's Open Source Summit North America , Linus Torvalds, the creator of Linux, discussed various topics related to Linux
Sign Up

Get the Latest News & Insights

Sign up to get the latest security news affecting Linux and open source delivered straight to your inbox.

© 2024 Guardian Digital, Inc All Rights Reserved