FreeBSD : Python -- Regular Expression DoS attack against client (a27b0bb6-84fc-11ea-b5b4-641c67a117d8)

medium Nessus Plugin ID 135944

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Synopsis

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

Description

Ben Caller and Matt Schwager reports :

Python 2.7 through 2.7.17, 3.5 through 3.5.9, 3.6 through 3.6.10, 3.7 through 3.7.6, and 3.8 through 3.8.1 allows an HTTP server to conduct Regular Expression Denial of Service (ReDoS) attacks against a client because of urllib.request.AbstractBasicAuthHandler catastrophic backtracking.

Solution

Update the affected packages.

See Also

http://www.nessus.org/u?5a737804

https://bugs.python.org/issue39503

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=245819

http://www.nessus.org/u?d35741e0

Plugin Details

Severity: Medium

ID: 135944

File Name: freebsd_pkg_a27b0bb684fc11eab5b4641c67a117d8.nasl

Version: 1.5

Type: local

Published: 4/24/2020

Updated: 6/17/2020

Dependencies: ssh_get_info.nasl

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

CVSS v2

Risk Factor: High

Base Score: 7.1

Temporal Score: 5.3

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

Temporal Vector: E:U/RL:OF/RC:C

CVSS v3

Risk Factor: Medium

Base Score: 6.5

Temporal Score: 5.7

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

Temporal Vector: E:U/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:freebsd:freebsd:python27, p-cpe:/a:freebsd:freebsd:python35, p-cpe:/a:freebsd:freebsd:python36, p-cpe:/a:freebsd:freebsd:python37, p-cpe:/a:freebsd:freebsd:python38, cpe:/o:freebsd:freebsd

Required KB Items: Host/local_checks_enabled, Host/FreeBSD/release, Host/FreeBSD/pkg_info

Exploit Ease: No known exploits are available

Patch Publication Date: 4/23/2020

Vulnerability Publication Date: 11/17/2019

Reference Information

CVE: CVE-2020-8492