CVE-2020-12443

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Summary

CVECVE-2020-12443
StatePUBLIC
Assigner[email protected]
Source PriorityCVE Program / NVD first with legacy fallback
Published2020-04-29 02:15:00 UTC
Updated2020-05-06 14:02:00 UTC
DescriptionBigBlueButton 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.

Risk And Classification

Problem Types: CWE-22

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Bigbluebutton Bigbluebutton All All All All
Application Bigbluebutton Bigbluebutton All All All All

References

ReferenceSourceLinkTags
GitHub - mclab-hbrs/BBB-POC: Proof Of Concept Exploits For BBB MISC github.com Exploit, Third Party Advisory
Return 404 error when presentation file download is not allowed. by GhaziTriki · Pull Request #9259 · bigbluebutton/bigbluebutton · GitHub MISC github.com Patch, Third Party Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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