Vulnerabilities
Misconfiguration
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CVE Vulnerabilities

CVE-2020-8492

Uncontrolled Resource Consumption

Published: Jan 30, 2020 | Modified: Nov 21, 2024
CVSS 3.x
6.5
MEDIUM
Source:
NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
CVSS 2.x
7.1 HIGH
AV:N/AC:M/Au:N/C:N/I:N/A:C
RedHat/V2
RedHat/V3
6.5 MODERATE
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Ubuntu
LOW
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Additional information
NVDhttps://nvd.nist.gov/vuln/detail/CVE-2020-8492
CWEhttps://cwe.mitre.org/data/definitions/400.html

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.

Weakness

The product does not properly control the allocation and maintenance of a limited resource.

Affected Software

NameVendorStart VersionEnd Version
PythonPython2.7.0 (including)2.7.17 (including)
PythonPython3.5.0 (including)3.5.9 (including)
PythonPython3.6.0 (including)3.6.10 (including)
PythonPython3.7.0 (including)3.7.6 (including)
PythonPython3.8.0 (including)3.8.1 (including)
Red Hat Enterprise Linux 7RedHatpython3-0:3.6.8-17.el7*
Red Hat Enterprise Linux 8RedHatpython3-0:3.6.8-31.el8*
Red Hat Enterprise Linux 8RedHatpython38:3.8-8030020200818121840.4190259b*
Red Hat Enterprise Linux 8RedHatpython3-0:3.6.8-31.el8*
Red Hat Software Collections for Red Hat Enterprise Linux 6RedHatrh-python36-python-0:3.6.12-1.el6*
Red Hat Software Collections for Red Hat Enterprise Linux 6RedHatrh-python36-python-pip-0:9.0.1-5.el6*
Red Hat Software Collections for Red Hat Enterprise Linux 6RedHatrh-python36-python-virtualenv-0:15.1.0-3.el6*
Red Hat Software Collections for Red Hat Enterprise Linux 7RedHatrh-python36-python-0:3.6.12-1.el7*
Red Hat Software Collections for Red Hat Enterprise Linux 7RedHatrh-python36-python-pip-0:9.0.1-5.el7*
Red Hat Software Collections for Red Hat Enterprise Linux 7RedHatrh-python36-python-virtualenv-0:15.1.0-3.el7*
Red Hat Software Collections for Red Hat Enterprise Linux 7.6 EUSRedHatrh-python36-python-0:3.6.12-1.el7*
Red Hat Software Collections for Red Hat Enterprise Linux 7.6 EUSRedHatrh-python36-python-pip-0:9.0.1-5.el7*
Red Hat Software Collections for Red Hat Enterprise Linux 7.6 EUSRedHatrh-python36-python-virtualenv-0:15.1.0-3.el7*
Red Hat Software Collections for Red Hat Enterprise Linux 7.7 EUSRedHatrh-python36-python-0:3.6.12-1.el7*
Red Hat Software Collections for Red Hat Enterprise Linux 7.7 EUSRedHatrh-python36-python-pip-0:9.0.1-5.el7*
Red Hat Software Collections for Red Hat Enterprise Linux 7.7 EUSRedHatrh-python36-python-virtualenv-0:15.1.0-3.el7*
Python2.7Ubuntubionic*
Python2.7Ubuntueoan*
Python2.7Ubuntuesm-apps/focal*
Python2.7Ubuntuesm-infra-legacy/trusty*
Python2.7Ubuntuesm-infra/bionic*
Python2.7Ubuntuesm-infra/xenial*
Python2.7Ubuntufocal*
Python2.7Ubuntugroovy*
Python2.7Ubuntuhirsute*
Python2.7Ubuntuimpish*
Python2.7Ubuntutrusty*
Python2.7Ubuntutrusty/esm*
Python2.7Ubuntuxenial*
Python3.4Ubuntuesm-infra-legacy/trusty*
Python3.4Ubuntutrusty*
Python3.4Ubuntutrusty/esm*
Python3.5Ubuntuesm-infra-legacy/trusty*
Python3.5Ubuntuesm-infra/xenial*
Python3.5Ubuntutrusty*
Python3.5Ubuntutrusty/esm*
Python3.5Ubuntuxenial*
Python3.6Ubuntubionic*
Python3.6Ubuntuesm-infra/bionic*
Python3.7Ubuntubionic*
Python3.7Ubuntueoan*
Python3.7Ubuntuesm-apps/bionic*
Python3.8Ubuntubionic*
Python3.8Ubuntueoan*
Python3.8Ubuntuesm-apps/bionic*
Python3.8Ubuntuesm-infra/focal*
Python3.8Ubuntufocal*
Python3.8Ubuntugroovy*

Potential Mitigations

  • Mitigation of resource exhaustion attacks requires that the target system either:

  • The first of these solutions is an issue in itself though, since it may allow attackers to prevent the use of the system by a particular valid user. If the attacker impersonates the valid user, they may be able to prevent the user from accessing the server in question.

  • The second solution is simply difficult to effectively institute – and even when properly done, it does not provide a full solution. It simply makes the attack require more resources on the part of the attacker.

References

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