CVE-2020-12443

CRITICAL

9.8

Description

BigBlueButton before 2.2.6 allows remote attackers to read arbitrary files because the presfilename (lowercase) value can be a .pdf filename while the presFilename (mixed case) value has a ../ sequence. This can be leveraged for privilege escalation via a directory traversal to bigbluebutton.properties. NOTE: this issue exists because of an ineffective mitigation to CVE-2020-12112 in which there was an attempted fix within an NGINX configuration file, without considering that the relevant part of NGINX is case-insensitive.

CVE Details

CVSS v3.1 Score9.8

SeverityCRITICAL

CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredNONE

User InteractionNONE

Published4/29/2020

Last Modified11/21/2024

Sourcenvd

Honeypot Sightings0

Affected Products

bigbluebutton:bigbluebutton

Weaknesses (CWE)

CWE-22

References

https://github.com/bigbluebutton/bigbluebutton/pull/9259/commits/b21ca8355a57286a1e6df96984b3a4c57679a463(cve@mitre.org)

https://github.com/mclab-hbrs/BBB-POC(cve@mitre.org)

https://github.com/bigbluebutton/bigbluebutton/pull/9259/commits/b21ca8355a57286a1e6df96984b3a4c57679a463(af854a3a-2127-422b-91ae-364da2661108)

https://github.com/mclab-hbrs/BBB-POC(af854a3a-2127-422b-91ae-364da2661108)

IOC Correlations

No correlations recorded

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