Vulnerability Details CVE-2020-12443
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.008
EPSS Ranking 73.9%
CVSS Severity
CVSS v3 Score 9.8
CVSS v2 Score 7.5
References
Products affected by CVE-2020-12443
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cpe:2.3:a:bigbluebutton:bigbluebutton:-
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cpe:2.3:a:bigbluebutton:bigbluebutton:0.7
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cpe:2.3:a:bigbluebutton:bigbluebutton:0.71
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cpe:2.3:a:bigbluebutton:bigbluebutton:0.8
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cpe:2.3:a:bigbluebutton:bigbluebutton:0.81
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cpe:2.3:a:bigbluebutton:bigbluebutton:0.9.0
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cpe:2.3:a:bigbluebutton:bigbluebutton:0.9.1
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cpe:2.3:a:bigbluebutton:bigbluebutton:0.9.2
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cpe:2.3:a:bigbluebutton:bigbluebutton:1.0.0
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cpe:2.3:a:bigbluebutton:bigbluebutton:1.1.0
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cpe:2.3:a:bigbluebutton:bigbluebutton:2.0
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cpe:2.3:a:bigbluebutton:bigbluebutton:2.2.0
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cpe:2.3:a:bigbluebutton:bigbluebutton:2.2.1
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cpe:2.3:a:bigbluebutton:bigbluebutton:2.2.2
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cpe:2.3:a:bigbluebutton:bigbluebutton:2.2.3
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cpe:2.3:a:bigbluebutton:bigbluebutton:2.2.4
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cpe:2.3:a:bigbluebutton:bigbluebutton:2.2.5