Debian DLA-2808-1 : python3.5 - LTS security update

high Nessus Plugin ID 154923


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


The remote Debian 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the dla-2808 advisory.

- 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)

- 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.

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


Upgrade the python3.5 packages.

For Debian 9 stretch, these problems have been fixed in version 3.5.3-1+deb9u5.

See Also

Plugin Details

Severity: High

ID: 154923

File Name: debian_DLA-2808.nasl

Version: 1.5

Type: local

Agent: unix

Published: 11/5/2021

Updated: 11/27/2023

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

Risk Information


Risk Factor: Medium

Score: 4.4


Risk Factor: High

Base Score: 7.1

Temporal Score: 5.6

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

CVSS Score Source: CVE-2021-3737


Risk Factor: High

Base Score: 7.5

Temporal Score: 6.7

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

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

Vulnerability Information

CPE: p-cpe:/a:debian:debian_linux:idle-python3.5, p-cpe:/a:debian:debian_linux:libpython3.5, p-cpe:/a:debian:debian_linux:libpython3.5-dbg, p-cpe:/a:debian:debian_linux:libpython3.5-dev, p-cpe:/a:debian:debian_linux:libpython3.5-minimal, p-cpe:/a:debian:debian_linux:libpython3.5-stdlib, p-cpe:/a:debian:debian_linux:libpython3.5-testsuite, p-cpe:/a:debian:debian_linux:python3.5, p-cpe:/a:debian:debian_linux:python3.5-dbg, p-cpe:/a:debian:debian_linux:python3.5-dev, p-cpe:/a:debian:debian_linux:python3.5-doc, p-cpe:/a:debian:debian_linux:python3.5-examples, p-cpe:/a:debian:debian_linux:python3.5-minimal, p-cpe:/a:debian:debian_linux:python3.5-venv, cpe:/o:debian:debian_linux:9.0

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: 11/5/2021

Vulnerability Publication Date: 9/20/2021

Reference Information

CVE: CVE-2021-3733, CVE-2021-3737