CVE-2020-12443 Path traversal in n/a
Remote attackers can read arbitrary files and escalate privileges via directory traversal in BigBlueButton due to case-insensitive NGINX configuration handling.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2020-12443?
CVE-2020-12443 is a critical path traversal vulnerability in n/a, published on 29 Apr 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-22
Which versions are affected by CVE-2020-12443?
It affects 1 product.
Products include Bigbluebutton Bigbluebutton.
How do I fix CVE-2020-12443?
No fix has been published for CVE-2020-12443 yet. Limit exposure of the affected software until one is available.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2020-12443 being exploited?
There is no known exploitation of CVE-2020-12443 in the wild and no public exploit code.
Other vulnerabilities in n/a
Sources
Also known as GHSA-hp96-66jq-q83w.