Debian DLA-3477-1 : python3.7 - LTS security update

high Nessus Plugin ID 177875

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Synopsis

The remote Debian host is missing one or more security-related updates.

Description

The remote Debian 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the dla-3477 advisory.

- In Python (aka CPython) up to 3.10.8, the mailcap module does not add escape characters into commands discovered in the system mailcap file. This may allow attackers to inject shell commands into applications that call mailcap.findmatch with untrusted input (if they lack validation of user-provided filenames or arguments). The fix is also back-ported to 3.7, 3.8, 3.9 (CVE-2015-20107)

- A flaw was found in python. In algorithms with quadratic time complexity using non-binary bases, when using int(text), a system could take 50ms to parse an int string with 100,000 digits and 5s for 1,000,000 digits (float, decimal, int.from_bytes(), and int() for binary bases 2, 4, 8, 16, and 32 are not affected). The highest threat from this vulnerability is to system availability. (CVE-2020-10735)

- There's a flaw in Python 3's pydoc. A local or adjacent attacker who discovers or is able to convince another local or adjacent user to start a pydoc server could access the server and use it to disclose sensitive information belonging to the other user that they would not normally be able to access. The highest risk of this flaw is to data confidentiality. This flaw affects Python versions before 3.8.9, Python versions before 3.9.3 and Python versions before 3.10.0a7. (CVE-2021-3426)

- There's a flaw in urllib's AbstractBasicAuthHandler class. An attacker who controls a malicious HTTP server that an HTTP client (such as web browser) connects to, could trigger a Regular Expression Denial of Service (ReDOS) during an authentication request with a specially crafted payload that is sent by the server to the client. The greatest threat that this flaw poses is to application availability.
(CVE-2021-3733)

- A flaw was found in python. An improperly handled HTTP response in the HTTP client code of python may allow a remote attacker, who controls the HTTP server, to make the client script enter an infinite loop, consuming CPU time. The highest threat from this vulnerability is to system availability. (CVE-2021-3737)

- A flaw was found in Python, specifically in the FTP (File Transfer Protocol) client library in PASV (passive) mode. The issue is how the FTP client trusts the host from the PASV response by default. This flaw allows an attacker to set up a malicious FTP server that can trick FTP clients into connecting back to a given IP address and port. This vulnerability could lead to FTP client scanning ports, which otherwise would not have been possible. (CVE-2021-4189)

- An issue was discovered in Python before 3.11.1. An unnecessary quadratic algorithm exists in one path when processing some inputs to the IDNA (RFC 3490) decoder, such that a crafted, unreasonably long name being presented to the decoder could lead to a CPU denial of service. Hostnames are often supplied by remote servers that could be controlled by a malicious actor; in such a scenario, they could trigger excessive CPU consumption on the client attempting to make use of an attacker-supplied supposed hostname.
For example, the attack payload could be placed in the Location header of an HTTP response with status code 302. A fix is planned in 3.11.1, 3.10.9, 3.9.16, 3.8.16, and 3.7.16. (CVE-2022-45061)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Solution

Upgrade the python3.7 packages.

For Debian 10 buster, these problems have been fixed in version 3.7.3-2+deb10u5.

Plugin Details

Severity: High

ID: 177875

File Name: debian_DLA-3477.nasl

Version: 1.0

Type: local

Agent: unix

Family: Debian Local Security Checks

Published: 7/1/2023

Updated: 7/1/2023

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

Risk Information

VPR

Risk Factor: Medium

Score: 5.5

CVSS v2

Risk Factor: High

Base Score: 8

Temporal Score: 6.6

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

CVSS Score Source: CVE-2015-20107

CVSS v3

Risk Factor: High

Base Score: 7.6

Temporal Score: 7.1

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

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

Vulnerability Information

CPE: cpe:/o:debian:debian_linux:10.0, p-cpe:/a:debian:debian_linux:idle-python3.7, p-cpe:/a:debian:debian_linux:python3.7-examples, p-cpe:/a:debian:debian_linux:python3.7-dev, p-cpe:/a:debian:debian_linux:libpython3.7, p-cpe:/a:debian:debian_linux:python3.7-doc, p-cpe:/a:debian:debian_linux:libpython3.7-dbg, p-cpe:/a:debian:debian_linux:libpython3.7-testsuite, p-cpe:/a:debian:debian_linux:python3.7-venv, p-cpe:/a:debian:debian_linux:libpython3.7-stdlib, p-cpe:/a:debian:debian_linux:python3.7, p-cpe:/a:debian:debian_linux:python3.7-dbg, p-cpe:/a:debian:debian_linux:python3.7-minimal, p-cpe:/a:debian:debian_linux:libpython3.7-dev, p-cpe:/a:debian:debian_linux:libpython3.7-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: 6/30/2023

Vulnerability Publication Date: 4/7/2021

Reference Information

CVE: CVE-2015-20107, CVE-2020-10735, CVE-2021-3426, CVE-2021-3733, CVE-2021-3737, CVE-2021-4189, CVE-2022-45061

Detections

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