6.5
MEDIUM
CVE-2020-8492
Python HTTP ReDoS Vulnerability
Description

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.

INFO

Published Date :

Jan. 30, 2020, 7:15 p.m.

Last Modified :

Nov. 7, 2023, 3:26 a.m.

Source :

[email protected]

Remotely Exploitable :

Yes !

Impact Score :

3.6

Exploitability Score :

2.8
Public PoC/Exploit Available at Github

CVE-2020-8492 has a 4 public PoC/Exploit available at Github. Go to the Public Exploits tab to see the list.

Affected Products

The following products are affected by CVE-2020-8492 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Canonical ubuntu_linux
1 Fedoraproject fedora
1 Debian debian_linux
1 Opensuse leap
1 Python python
: Total Affected Vendor : 5 | Products : 5
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2020-8492.

URL Resource
http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00003.html Third Party Advisory
https://bugs.python.org/issue39503 Issue Tracking Vendor Advisory
https://github.com/python/cpython/pull/18284 Patch Third Party Advisory
https://lists.apache.org/thread.html/rdb31a608dd6758c6093fd645aea3fbf022dd25b37109b6aaea5bc0b5%40%3Ccommits.cassandra.apache.org%3E
https://lists.apache.org/thread.html/rfec113c733162b39633fd86a2d0f34bf42ac35f711b3ec1835c774da%40%3Ccommits.cassandra.apache.org%3E
https://lists.debian.org/debian-lts-announce/2020/07/msg00011.html Mailing List Third Party Advisory
https://lists.debian.org/debian-lts-announce/2023/05/msg00024.html
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7WOKDEXLYW5UQ4S7PA7E37IITOC7C56J/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/A5NSAX4SC3V64PGZUPH7PRDLSON34Q5A/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/APGWEMYZIY5VHLCSZ3HD67PA5Z2UQFGH/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UESGYI5XDAHJBATEZN3MHNDUBDH47AS6/
https://python-security.readthedocs.io/vuln/urllib-basic-auth-regex.html Exploit Third Party Advisory
https://security.gentoo.org/glsa/202005-09 Third Party Advisory
https://security.netapp.com/advisory/ntap-20200221-0001/ Third Party Advisory
https://usn.ubuntu.com/4333-1/ Third Party Advisory
https://usn.ubuntu.com/4333-2/ Third Party Advisory

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Profile Photo
vincent-deng/veracode-container-security-finding-parser

Map Vulnerabilities into Different Layers of the Container Image

Python

Updated: 1 year, 10 months ago
1 stars 0 fork 0 watcher
Born at : Oct. 5, 2022, 12:07 p.m. This repo has been linked 1276 different CVEs too.
Profile Photo
retr0-13/regexploit

None

Python JavaScript C#

Updated: 2 years, 8 months ago
0 stars 0 fork 0 watcher
Born at : March 22, 2022, 1:01 p.m. This repo has been linked 11 different CVEs too.
Profile Photo
engn33r/awesome-redos-security

List of RegEx DoS (ReDoS) CVEs and resources

security awesome redos regex dos regex-dos pentesting awesome-list regex-security

Updated: 4 months, 3 weeks ago
23 stars 2 fork 2 watcher
Born at : June 10, 2021, 1:57 a.m. This repo has been linked 76 different CVEs too.
Profile Photo
doyensec/regexploit

Find regular expressions which are vulnerable to ReDoS (Regular Expression Denial of Service)

Python JavaScript C#

Updated: 2 months, 3 weeks ago
782 stars 50 fork 50 watcher
Born at : Nov. 24, 2020, 7:24 p.m. This repo has been linked 11 different CVEs too.

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2020-8492 vulnerability anywhere in the article.

The following table lists the changes that have been made to the CVE-2020-8492 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Modified by [email protected]

    May. 14, 2024

    Action Type Old Value New Value
  • CVE Modified by [email protected]

    Nov. 07, 2023

    Action Type Old Value New Value
    Added Reference MITRE https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/APGWEMYZIY5VHLCSZ3HD67PA5Z2UQFGH/ [No types assigned]
    Added Reference MITRE https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7WOKDEXLYW5UQ4S7PA7E37IITOC7C56J/ [No types assigned]
    Added Reference MITRE https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UESGYI5XDAHJBATEZN3MHNDUBDH47AS6/ [No types assigned]
    Added Reference MITRE https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/A5NSAX4SC3V64PGZUPH7PRDLSON34Q5A/ [No types assigned]
    Added Reference MITRE https://lists.apache.org/thread.html/rdb31a608dd6758c6093fd645aea3fbf022dd25b37109b6aaea5bc0b5%40%3Ccommits.cassandra.apache.org%3E [No types assigned]
    Added Reference MITRE https://lists.apache.org/thread.html/rfec113c733162b39633fd86a2d0f34bf42ac35f711b3ec1835c774da%40%3Ccommits.cassandra.apache.org%3E [No types assigned]
    Removed Reference MITRE https://lists.fedoraproject.org/archives/list/[email protected]/message/APGWEMYZIY5VHLCSZ3HD67PA5Z2UQFGH/
    Removed Reference MITRE https://lists.fedoraproject.org/archives/list/[email protected]/message/7WOKDEXLYW5UQ4S7PA7E37IITOC7C56J/
    Removed Reference MITRE https://lists.fedoraproject.org/archives/list/[email protected]/message/UESGYI5XDAHJBATEZN3MHNDUBDH47AS6/
    Removed Reference MITRE https://lists.fedoraproject.org/archives/list/[email protected]/message/A5NSAX4SC3V64PGZUPH7PRDLSON34Q5A/
    Removed Reference MITRE https://lists.apache.org/thread.html/rdb31a608dd6758c6093fd645aea3fbf022dd25b37109b6aaea5bc0b5@%3Ccommits.cassandra.apache.org%3E
    Removed Reference MITRE https://lists.apache.org/thread.html/rfec113c733162b39633fd86a2d0f34bf42ac35f711b3ec1835c774da@%3Ccommits.cassandra.apache.org%3E
  • CVE Modified by [email protected]

    May. 24, 2023

    Action Type Old Value New Value
    Added Reference https://lists.debian.org/debian-lts-announce/2023/05/msg00024.html [No Types Assigned]
  • Modified Analysis by [email protected]

    Sep. 16, 2021

    Action Type Old Value New Value
    Changed Reference Type https://lists.apache.org/thread.html/rdb31a608dd6758c6093fd645aea3fbf022dd25b37109b6aaea5bc0b5@%3Ccommits.cassandra.apache.org%3E No Types Assigned https://lists.apache.org/thread.html/rdb31a608dd6758c6093fd645aea3fbf022dd25b37109b6aaea5bc0b5@%3Ccommits.cassandra.apache.org%3E Mailing List, Third Party Advisory
    Changed Reference Type https://lists.apache.org/thread.html/rfec113c733162b39633fd86a2d0f34bf42ac35f711b3ec1835c774da@%3Ccommits.cassandra.apache.org%3E No Types Assigned https://lists.apache.org/thread.html/rfec113c733162b39633fd86a2d0f34bf42ac35f711b3ec1835c774da@%3Ccommits.cassandra.apache.org%3E Mailing List, Third Party Advisory
    Changed Reference Type https://lists.debian.org/debian-lts-announce/2020/07/msg00011.html No Types Assigned https://lists.debian.org/debian-lts-announce/2020/07/msg00011.html Mailing List, Third Party Advisory
    Changed Reference Type https://lists.fedoraproject.org/archives/list/[email protected]/message/7WOKDEXLYW5UQ4S7PA7E37IITOC7C56J/ No Types Assigned https://lists.fedoraproject.org/archives/list/[email protected]/message/7WOKDEXLYW5UQ4S7PA7E37IITOC7C56J/ Mailing List, Third Party Advisory
    Changed Reference Type https://lists.fedoraproject.org/archives/list/[email protected]/message/A5NSAX4SC3V64PGZUPH7PRDLSON34Q5A/ No Types Assigned https://lists.fedoraproject.org/archives/list/[email protected]/message/A5NSAX4SC3V64PGZUPH7PRDLSON34Q5A/ Mailing List, Third Party Advisory
    Changed Reference Type https://lists.fedoraproject.org/archives/list/[email protected]/message/APGWEMYZIY5VHLCSZ3HD67PA5Z2UQFGH/ No Types Assigned https://lists.fedoraproject.org/archives/list/[email protected]/message/APGWEMYZIY5VHLCSZ3HD67PA5Z2UQFGH/ Mailing List, Third Party Advisory
    Changed Reference Type https://lists.fedoraproject.org/archives/list/[email protected]/message/UESGYI5XDAHJBATEZN3MHNDUBDH47AS6/ No Types Assigned https://lists.fedoraproject.org/archives/list/[email protected]/message/UESGYI5XDAHJBATEZN3MHNDUBDH47AS6/ Mailing List, Third Party Advisory
    Changed Reference Type https://security.gentoo.org/glsa/202005-09 No Types Assigned https://security.gentoo.org/glsa/202005-09 Third Party Advisory
    Changed Reference Type https://usn.ubuntu.com/4333-1/ No Types Assigned https://usn.ubuntu.com/4333-1/ Third Party Advisory
    Changed Reference Type https://usn.ubuntu.com/4333-2/ No Types Assigned https://usn.ubuntu.com/4333-2/ Third Party Advisory
    Added CPE Configuration OR *cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:*:*:*:* *cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:esm:*:*:* *cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:esm:*:*:* *cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:* *cpe:2.3:o:canonical:ubuntu_linux:19.10:*:*:*:*:*:*:* *cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:*
    Added CPE Configuration OR *cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:* *cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*
    Added CPE Configuration OR *cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
  • CVE Modified by [email protected]

    Aug. 16, 2021

    Action Type Old Value New Value
    Added Reference https://lists.apache.org/thread.html/rfec113c733162b39633fd86a2d0f34bf42ac35f711b3ec1835c774da@%3Ccommits.cassandra.apache.org%3E [No Types Assigned]
  • CVE Modified by [email protected]

    Aug. 16, 2021

    Action Type Old Value New Value
    Added Reference https://lists.apache.org/thread.html/rdb31a608dd6758c6093fd645aea3fbf022dd25b37109b6aaea5bc0b5@%3Ccommits.cassandra.apache.org%3E [No Types Assigned]
  • CVE Modified by [email protected]

    Jul. 15, 2020

    Action Type Old Value New Value
    Added Reference https://lists.debian.org/debian-lts-announce/2020/07/msg00011.html [No Types Assigned]
  • CVE Modified by [email protected]

    Jul. 10, 2020

    Action Type Old Value New Value
    Added Reference https://lists.fedoraproject.org/archives/list/[email protected]/message/A5NSAX4SC3V64PGZUPH7PRDLSON34Q5A/ [No Types Assigned]
  • CVE Modified by [email protected]

    Jul. 04, 2020

    Action Type Old Value New Value
    Added Reference https://lists.fedoraproject.org/archives/list/[email protected]/message/UESGYI5XDAHJBATEZN3MHNDUBDH47AS6/ [No Types Assigned]
  • CVE Modified by [email protected]

    May. 29, 2020

    Action Type Old Value New Value
    Added Reference https://lists.fedoraproject.org/archives/list/[email protected]/message/7WOKDEXLYW5UQ4S7PA7E37IITOC7C56J/ [No Types Assigned]
  • CVE Modified by [email protected]

    May. 26, 2020

    Action Type Old Value New Value
    Added Reference https://lists.fedoraproject.org/archives/list/[email protected]/message/APGWEMYZIY5VHLCSZ3HD67PA5Z2UQFGH/ [No Types Assigned]
  • CVE Modified by [email protected]

    May. 15, 2020

    Action Type Old Value New Value
    Added Reference https://security.gentoo.org/glsa/202005-09 [No Types Assigned]
  • CVE Modified by [email protected]

    May. 04, 2020

    Action Type Old Value New Value
    Added Reference https://usn.ubuntu.com/4333-2/ [No Types Assigned]
  • CVE Modified by [email protected]

    Apr. 29, 2020

    Action Type Old Value New Value
    Added Reference https://usn.ubuntu.com/4333-1/ [No Types Assigned]
  • Modified Analysis by [email protected]

    Mar. 05, 2020

    Action Type Old Value New Value
    Added CVSS V2 Metadata Victim must voluntarily interact with attack mechanism
    Removed CVSS V2 NIST (AV:N/AC:L/Au:N/C:N/I:N/A:P)
    Added CVSS V2 NIST (AV:N/AC:M/Au:N/C:N/I:N/A:C)
    Removed CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
    Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
    Changed Reference Type http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00003.html No Types Assigned http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00003.html Third Party Advisory
    Changed Reference Type https://security.netapp.com/advisory/ntap-20200221-0001/ No Types Assigned https://security.netapp.com/advisory/ntap-20200221-0001/ Third Party Advisory
    Removed CWE NIST NVD-CWE-Other
    Added CWE NIST CWE-400
    Added CPE Configuration OR *cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:*
  • CVE Modified by [email protected]

    Mar. 02, 2020

    Action Type Old Value New Value
    Added Reference http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00003.html [No Types Assigned]
  • CVE Modified by [email protected]

    Feb. 24, 2020

    Action Type Old Value New Value
    Added Reference https://security.netapp.com/advisory/ntap-20200221-0001/ [No Types Assigned]
  • Initial Analysis by [email protected]

    Feb. 05, 2020

    Action Type Old Value New Value
    Added CVSS V2 NIST (AV:N/AC:L/Au:N/C:N/I:N/A:P)
    Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
    Changed Reference Type https://bugs.python.org/issue39503 No Types Assigned https://bugs.python.org/issue39503 Issue Tracking, Vendor Advisory
    Changed Reference Type https://github.com/python/cpython/pull/18284 No Types Assigned https://github.com/python/cpython/pull/18284 Patch, Third Party Advisory
    Changed Reference Type https://python-security.readthedocs.io/vuln/urllib-basic-auth-regex.html No Types Assigned https://python-security.readthedocs.io/vuln/urllib-basic-auth-regex.html Exploit, Third Party Advisory
    Added CWE NIST NVD-CWE-Other
    Added CPE Configuration OR *cpe:2.3:a:python:python:*:*:*:*:*:*:*:* versions from (including) 2.7.0 up to (including) 2.7.17 *cpe:2.3:a:python:python:*:*:*:*:*:*:*:* versions from (including) 3.5.0 up to (including) 3.5.9 *cpe:2.3:a:python:python:*:*:*:*:*:*:*:* versions from (including) 3.6.0 up to (including) 3.6.10 *cpe:2.3:a:python:python:*:*:*:*:*:*:*:* versions from (including) 3.7.0 up to (including) 3.7.6 *cpe:2.3:a:python:python:*:*:*:*:*:*:*:* versions from (including) 3.8.0 up to (including) 3.8.1
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2020-8492 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2020-8492 weaknesses.

Exploit Prediction

EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.

0.60 }} -0.24%

score

0.78302

percentile

CVSS31 - Vulnerability Scoring System
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
: