Directory Traversal Vulnerability in BigBlueButton by Blindspot Technologies
CVE-2020-12443

9.8CRITICAL

Key Information:

Vendor

Bigbluebutton

Status
Bigbluebutton
Vendor
CVE Published:
29 April 2020

What is CVE-2020-12443?

The vulnerability in BigBlueButton allows remote attackers to exploit improper handling of filename casing to perform directory traversal attacks. By manipulating the 'presfilename' and 'presFilename' parameters, an attacker can read arbitrary files, including sensitive configuration files like bigbluebutton.properties. This flaw arose from a previous fix that inadequately addressed the underlying issue, primarily due to the case-insensitive nature of NGINX configurations. Such vulnerabilities highlight the critical need for robust input validation and thorough security practices within web applications.

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References

https://github.com/mclab-hbrs/BBB-POC
x_refsource_MISC
https://github.com/bigbluebutton/bigbluebutton/pull/9259/...
x_refsource_MISC

CVSS V3.1

Score:
9.8
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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