What is the severity of CVE-2021-31556?

CVE-2021-31556 is classified as a medium severity vulnerability due to its potential impact on RSA key storage.

How do I fix CVE-2021-31556?

To fix CVE-2021-31556, update to MediaWiki version 1.35.2 or later, as well as the relevant Fedora packages.

What causes CVE-2021-31556?

CVE-2021-31556 is caused by the MWOAuthConsumerSubmitControl.php not enforcing proper length limits for RSA keys in MySQL.

What software is affected by CVE-2021-31556?

CVE-2021-31556 affects MediaWiki versions up to and including 1.35.2 and specific versions of Fedora.

Can CVE-2021-31556 be exploited remotely?

Yes, CVE-2021-31556 can potentially be exploited remotely if an attacker is able to manipulate RSA key submissions.

Vulnerability/
CVE-2021-31556

critical

9.8

CWE

1284

12/8/2021

3/8/2024

CVE-2021-31556

First published: Thu Aug 12 2021(Updated: )

An issue was discovered in the Oauth extension for MediaWiki through 1.35.2. MWOAuthConsumerSubmitControl.php does not ensure that the length of an RSA key will fit in a MySQL blob.

Credit: cve@mitre.org cve@mitre.org

Affected Software	Affected Version	How to fix
Wikimedia MediaWiki	<=1.35.2
Fedoraproject Fedora	=33
Fedoraproject Fedora	=34
Fedoraproject Fedora	=35

Remedy

https://gerrit.wikimedia.org/r/q/I13ff0350a9a0a3cd5ab3e1f82dd0d8d9c13cf9e9

Never miss a vulnerability like this again

Reference Links

Frequently Asked Questions

What is the severity of CVE-2021-31556?
CVE-2021-31556 is classified as a medium severity vulnerability due to its potential impact on RSA key storage.
How do I fix CVE-2021-31556?
To fix CVE-2021-31556, update to MediaWiki version 1.35.2 or later, as well as the relevant Fedora packages.
What causes CVE-2021-31556?
CVE-2021-31556 is caused by the MWOAuthConsumerSubmitControl.php not enforcing proper length limits for RSA keys in MySQL.
What software is affected by CVE-2021-31556?
CVE-2021-31556 affects MediaWiki versions up to and including 1.35.2 and specific versions of Fedora.
Can CVE-2021-31556 be exploited remotely?
Yes, CVE-2021-31556 can potentially be exploited remotely if an attacker is able to manipulate RSA key submissions.

agent/author
agent/type
agent/weakness
agent/severity
agent/remedy
agent/description
collector/mitre-cve
source/MITRE
agent/last-modified-date
agent/references
agent/event
agent/first-publish-date
agent/source
agent/tags
collector/nvd-api
agent/software-canonical-lookup-request
collector/nvd-index
agent/softwarecombine
vendor/mediawiki
canonical/wikimedia mediawiki
version/wikimedia mediawiki/1.35.2
vendor/fedoraproject
canonical/fedoraproject fedora
version/fedoraproject fedora/33
version/fedoraproject fedora/34
version/fedoraproject fedora/35

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Frequently Asked Questions

What is the severity of CVE-2021-31556?
CVE-2021-31556 is classified as a medium severity vulnerability due to its potential impact on RSA key storage.
How do I fix CVE-2021-31556?
To fix CVE-2021-31556, update to MediaWiki version 1.35.2 or later, as well as the relevant Fedora packages.
What causes CVE-2021-31556?
CVE-2021-31556 is caused by the MWOAuthConsumerSubmitControl.php not enforcing proper length limits for RSA keys in MySQL.
What software is affected by CVE-2021-31556?
CVE-2021-31556 affects MediaWiki versions up to and including 1.35.2 and specific versions of Fedora.
Can CVE-2021-31556 be exploited remotely?
Yes, CVE-2021-31556 can potentially be exploited remotely if an attacker is able to manipulate RSA key submissions.