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Debian DLA-2628-1 : python2.7 security update

medium Nessus Plugin ID 148749

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Synopsis

The remote Debian host is missing a security update.

Description

Two security issues have been discovered in python2.7 :

CVE-2019-16935

The documentation XML-RPC server in Python 2.7 has XSS via the server_title field. This occurs in Lib/DocXMLRPCServer.py in Python 2.x, and in Lib/xmlrpc/server.py in Python 3.x. 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-2021-23336

The Python2.7 vulnerable to Web Cache Poisoning via urllib.parse.parse_qsl and urllib.parse.parse_qs by using a vector called parameter cloaking. When the attacker can separate query parameters using a semicolon (;), they can cause a difference in the interpretation of the request between the proxy (running with default configuration) and the server. This can result in malicious requests being cached as completely safe ones, as the proxy would usually not see the semicolon as a separator, and therefore would not include it in a cache key of an unkeyed parameter.

**Attention, API-change!** Please be sure your software is working properly if it uses `urllib.parse.parse_qs` or `urllib.parse.parse_qsl`, `cgi.parse` or `cgi.parse_multipart`.

Earlier Python versions allowed using both ``;`` and ``&`` as query parameter separators in `urllib.parse.parse_qs` and `urllib.parse.parse_qsl`. Due to security concerns, and to conform with newer W3C recommendations, this has been changed to allow only a single separator key, with ``&`` as the default. This change also affects `cgi.parse` and `cgi.parse_multipart` as they use the affected functions internally. For more details, please see their respective documentation.

For Debian 9 stretch, these problems have been fixed in version 2.7.13-2+deb9u5.

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/python2.7

NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

Solution

Upgrade the affected packages.

See Also

https://lists.debian.org/debian-lts-announce/2021/04/msg00015.html

https://packages.debian.org/source/stretch/python2.7

https://security-tracker.debian.org/tracker/source-package/python2.7

Plugin Details

Severity: Medium

ID: 148749

File Name: debian_DLA-2628.nasl

Version: 1.4

Type: local

Agent: unix

Published: 4/19/2021

Updated: 1/12/2024

Supported Sensors: Agentless Assessment, Frictionless Assessment Agent, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 5.0

CVSS v2

Risk Factor: Medium

Base Score: 4.3

Temporal Score: 3.4

Vector: CVSS2#AV:N/AC:M/Au:N/C:N/I:P/A:N

CVSS Score Source: CVE-2019-16935

CVSS v3

Risk Factor: Medium

Base Score: 6.1

Temporal Score: 5.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:debian:debian_linux:python2.7-doc, p-cpe:/a:debian:debian_linux:libpython2.7-dbg, p-cpe:/a:debian:debian_linux:libpython2.7-minimal, p-cpe:/a:debian:debian_linux:libpython2.7-stdlib, cpe:/o:debian:debian_linux:9.0, p-cpe:/a:debian:debian_linux:idle-python2.7, p-cpe:/a:debian:debian_linux:python2.7-dbg, p-cpe:/a:debian:debian_linux:python2.7, p-cpe:/a:debian:debian_linux:libpython2.7-testsuite, p-cpe:/a:debian:debian_linux:python2.7-dev, p-cpe:/a:debian:debian_linux:python2.7-examples, p-cpe:/a:debian:debian_linux:libpython2.7, p-cpe:/a:debian:debian_linux:libpython2.7-dev, p-cpe:/a:debian:debian_linux:python2.7-minimal

Required KB Items: Host/local_checks_enabled, Host/Debian/release, Host/Debian/dpkg-l

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 4/17/2021

Vulnerability Publication Date: 9/28/2019

Reference Information

CVE: CVE-2019-16935, CVE-2021-23336