THREATPORT/VULNERABILITY/CVE-2020-12443
CRITICAL SEVERITY

CVE-2020-12443

Bigbluebutton vulnerability

CVSS
9.8
EPSS
3.6%
EPSS pct
88th
Exploited
No known
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.
Affected vendor
Bigbluebutton
Affected product
Bigbluebutton
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness type (CWE)
Published
2020-04-29

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring no privileges, no user interaction. Successful exploitation leads to high impact to confidentiality, high impact to integrity, high impact to availability.

Its EPSS score of 3.6% reflects a lower probability of exploitation activity in the wild over the next 30 days, placing it above 88% of all scored CVEs.

Check your external exposure to CVE-2020-12443

  • Confirm whether Bigbluebutton Bigbluebutton is running on any internet-facing host or subdomain.
  • Match discovered service fingerprints against the version affected by CVE-2020-12443.
  • Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2020-12443

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2020-12443 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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