CVE-2020-27604: Vulnerability Analysis & Exploit Details

Status: Analyzed - Last modified: 30-10-2020 Published: 21-10-2020

CVE-2020-27604
Vulnerability Scoring

6.5
/10

Attack Complexity Details

  • Attack Complexity: Low Impact
  • Attack Vector: NETWORK
  • Privileges Required: Low Impact
  • Scope: UNCHANGED
  • User Interaction: NONE

CIA Impact Definition

  • Confidentiality: HIGH IMPACT
  • Integrity:
  • Availability:

CVE-2020-27604 Vulnerability Summary

BigBlueButton before 2.3 does not implement LibreOffice sandboxing. This might make it easier for remote authenticated users to read the API shared secret in the bigbluebutton.properties file. With the API shared secret, an attacker can (for example) use api/join to join an arbitrary meeting regardless of its guestPolicy setting.

Access Complexity Graph for CVE-2020-27604

Impact Analysis for CVE-2020-27604

CVE-2020-27604: Detailed Information and External References

EPSS

0.00245

EPSS %

0.64160

References

0.00245

CWE

CWE-116

CAPEC

0.00245

  • Cross Zone Scripting: An attacker is able to cause a victim to load content into their web-browser that bypasses security zone controls and gain access to increased privileges to execute scripting code or other web objects such as unsigned ActiveX controls or applets. This is a privilege elevation attack targeted at zone-based web-browser security.
  • User-Controlled Filename: An attack of this type involves an adversary inserting malicious characters (such as a XSS redirection) into a filename, directly or indirectly that is then used by the target software to generate HTML text or other potentially executable content. Many websites rely on user-generated content and dynamically build resources like files, filenames, and URL links directly from user supplied data. In this attack pattern, the attacker uploads code that can execute in the client browser and/or redirect the client browser to a site that the attacker owns. All XSS attack payload variants can be used to pass and exploit these vulnerabilities.
  • Web Server Logs Tampering: Web Logs Tampering attacks involve an attacker injecting, deleting or otherwise tampering with the contents of web logs typically for the purposes of masking other malicious behavior. Additionally, writing malicious data to log files may target jobs, filters, reports, and other agents that process the logs in an asynchronous attack pattern. This pattern of attack is similar to "Log Injection-Tampering-Forging" except that in this case, the attack is targeting the logs of the web server and not the application.
  • AJAX Footprinting: This attack utilizes the frequent client-server roundtrips in Ajax conversation to scan a system. While Ajax does not open up new vulnerabilities per se, it does optimize them from an attacker point of view. A common first step for an attacker is to footprint the target environment to understand what attacks will work. Since footprinting relies on enumeration, the conversational pattern of rapid, multiple requests and responses that are typical in Ajax applications enable an attacker to look for many vulnerabilities, well-known ports, network locations and so on. The knowledge gained through Ajax fingerprinting can be used to support other attacks, such as XSS.

Vulnerable Configurations

  • cpe:2.3:a:bigbluebutton:bigbluebutton:-:*:*:*:*:*:*:*
    cpe:2.3:a:bigbluebutton:bigbluebutton:-:*:*:*:*:*:*:*
  • cpe:2.3:a:bigbluebutton:bigbluebutton:0.7:*:*:*:*:*:*:*
    cpe:2.3:a:bigbluebutton:bigbluebutton:0.7:*:*:*:*:*:*:*
  • cpe:2.3:a:bigbluebutton:bigbluebutton:0.8:-:*:*:*:*:*:*
    cpe:2.3:a:bigbluebutton:bigbluebutton:0.8:-:*:*:*:*:*:*
  • cpe:2.3:a:bigbluebutton:bigbluebutton:0.8:rc2:*:*:*:*:*:*
    cpe:2.3:a:bigbluebutton:bigbluebutton:0.8:rc2:*:*:*:*:*:*
  • cpe:2.3:a:bigbluebutton:bigbluebutton:0.9.0:beta:*:*:*:*:*:*
    cpe:2.3:a:bigbluebutton:bigbluebutton:0.9.0:beta:*:*:*:*:*:*
  • cpe:2.3:a:bigbluebutton:bigbluebutton:0.9.1:*:*:*:*:*:*:*
    cpe:2.3:a:bigbluebutton:bigbluebutton:0.9.1:*:*:*:*:*:*:*
  • cpe:2.3:a:bigbluebutton:bigbluebutton:0.9.2:*:*:*:*:*:*:*
    cpe:2.3:a:bigbluebutton:bigbluebutton:0.9.2:*:*:*:*:*:*:*
  • cpe:2.3:a:bigbluebutton:bigbluebutton:0.71:-:*:*:*:*:*:*
    cpe:2.3:a:bigbluebutton:bigbluebutton:0.71:-:*:*:*:*:*:*
  • cpe:2.3:a:bigbluebutton:bigbluebutton:0.71:a:*:*:*:*:*:*
    cpe:2.3:a:bigbluebutton:bigbluebutton:0.71:a:*:*:*:*:*:*
  • cpe:2.3:a:bigbluebutton:bigbluebutton:0.81:-:*:*:*:*:*:*
    cpe:2.3:a:bigbluebutton:bigbluebutton:0.81:-:*:*:*:*:*:*
  • cpe:2.3:a:bigbluebutton:bigbluebutton:0.81:b:*:*:*:*:*:*
    cpe:2.3:a:bigbluebutton:bigbluebutton:0.81:b:*:*:*:*:*:*
  • cpe:2.3:a:bigbluebutton:bigbluebutton:0.81:rc:*:*:*:*:*:*
    cpe:2.3:a:bigbluebutton:bigbluebutton:0.81:rc:*:*:*:*:*:*
  • cpe:2.3:a:bigbluebutton:bigbluebutton:0.81:rc2:*:*:*:*:*:*
    cpe:2.3:a:bigbluebutton:bigbluebutton:0.81:rc2:*:*:*:*:*:*
  • cpe:2.3:a:bigbluebutton:bigbluebutton:0.81:rc3:*:*:*:*:*:*
    cpe:2.3:a:bigbluebutton:bigbluebutton:0.81:rc3:*:*:*:*:*:*
  • cpe:2.3:a:bigbluebutton:bigbluebutton:0.81:rc4:*:*:*:*:*:*
    cpe:2.3:a:bigbluebutton:bigbluebutton:0.81:rc4:*:*:*:*:*:*
  • cpe:2.3:a:bigbluebutton:bigbluebutton:0.81:rc5:*:*:*:*:*:*
    cpe:2.3:a:bigbluebutton:bigbluebutton:0.81:rc5:*:*:*:*:*:*
  • cpe:2.3:a:bigbluebutton:bigbluebutton:1.0.0:*:*:*:*:*:*:*
    cpe:2.3:a:bigbluebutton:bigbluebutton:1.0.0:*:*:*:*:*:*:*
  • cpe:2.3:a:bigbluebutton:bigbluebutton:1.1.0:*:*:*:*:*:*:*
    cpe:2.3:a:bigbluebutton:bigbluebutton:1.1.0:*:*:*:*:*:*:*
  • cpe:2.3:a:bigbluebutton:bigbluebutton:2.0:-:*:*:*:*:*:*
    cpe:2.3:a:bigbluebutton:bigbluebutton:2.0:-:*:*:*:*:*:*
  • cpe:2.3:a:bigbluebutton:bigbluebutton:2.0:rc10:*:*:*:*:*:*
    cpe:2.3:a:bigbluebutton:bigbluebutton:2.0:rc10:*:*:*:*:*:*
  • cpe:2.3:a:bigbluebutton:bigbluebutton:2.0:rc11:*:*:*:*:*:*
    cpe:2.3:a:bigbluebutton:bigbluebutton:2.0:rc11:*:*:*:*:*:*
  • cpe:2.3:a:bigbluebutton:bigbluebutton:2.0:rc2:*:*:*:*:*:*
    cpe:2.3:a:bigbluebutton:bigbluebutton:2.0:rc2:*:*:*:*:*:*
  • cpe:2.3:a:bigbluebutton:bigbluebutton:2.0:rc3:*:*:*:*:*:*
    cpe:2.3:a:bigbluebutton:bigbluebutton:2.0:rc3:*:*:*:*:*:*
  • cpe:2.3:a:bigbluebutton:bigbluebutton:2.0:rc4:*:*:*:*:*:*
    cpe:2.3:a:bigbluebutton:bigbluebutton:2.0:rc4:*:*:*:*:*:*
  • cpe:2.3:a:bigbluebutton:bigbluebutton:2.0:rc5:*:*:*:*:*:*
    cpe:2.3:a:bigbluebutton:bigbluebutton:2.0:rc5:*:*:*:*:*:*
  • cpe:2.3:a:bigbluebutton:bigbluebutton:2.0:rc6:*:*:*:*:*:*
    cpe:2.3:a:bigbluebutton:bigbluebutton:2.0:rc6:*:*:*:*:*:*
  • cpe:2.3:a:bigbluebutton:bigbluebutton:2.0:rc7:*:*:*:*:*:*
    cpe:2.3:a:bigbluebutton:bigbluebutton:2.0:rc7:*:*:*:*:*:*
  • cpe:2.3:a:bigbluebutton:bigbluebutton:2.0:rc8:*:*:*:*:*:*
    cpe:2.3:a:bigbluebutton:bigbluebutton:2.0:rc8:*:*:*:*:*:*
  • cpe:2.3:a:bigbluebutton:bigbluebutton:2.0:rc9:*:*:*:*:*:*
    cpe:2.3:a:bigbluebutton:bigbluebutton:2.0:rc9:*:*:*:*:*:*
  • cpe:2.3:a:bigbluebutton:bigbluebutton:2.2.0:-:*:*:*:*:*:*
    cpe:2.3:a:bigbluebutton:bigbluebutton:2.2.0:-:*:*:*:*:*:*
  • cpe:2.3:a:bigbluebutton:bigbluebutton:2.2.0:rc1:*:*:*:*:*:*
    cpe:2.3:a:bigbluebutton:bigbluebutton:2.2.0:rc1:*:*:*:*:*:*
  • cpe:2.3:a:bigbluebutton:bigbluebutton:2.2.0:rc2:*:*:*:*:*:*
    cpe:2.3:a:bigbluebutton:bigbluebutton:2.2.0:rc2:*:*:*:*:*:*
  • cpe:2.3:a:bigbluebutton:bigbluebutton:2.2.0:rc3:*:*:*:*:*:*
    cpe:2.3:a:bigbluebutton:bigbluebutton:2.2.0:rc3:*:*:*:*:*:*
  • cpe:2.3:a:bigbluebutton:bigbluebutton:2.2.0:rc4:*:*:*:*:*:*
    cpe:2.3:a:bigbluebutton:bigbluebutton:2.2.0:rc4:*:*:*:*:*:*
  • cpe:2.3:a:bigbluebutton:bigbluebutton:2.2.0:rc5:*:*:*:*:*:*
    cpe:2.3:a:bigbluebutton:bigbluebutton:2.2.0:rc5:*:*:*:*:*:*
  • cpe:2.3:a:bigbluebutton:bigbluebutton:2.2.0:rc6:*:*:*:*:*:*
    cpe:2.3:a:bigbluebutton:bigbluebutton:2.2.0:rc6:*:*:*:*:*:*
  • cpe:2.3:a:bigbluebutton:bigbluebutton:2.2.0:beta2:*:*:*:*:*:*
    cpe:2.3:a:bigbluebutton:bigbluebutton:2.2.0:beta2:*:*:*:*:*:*
  • cpe:2.3:a:bigbluebutton:bigbluebutton:2.2.0:beta3:*:*:*:*:*:*
    cpe:2.3:a:bigbluebutton:bigbluebutton:2.2.0:beta3:*:*:*:*:*:*
  • cpe:2.3:a:bigbluebutton:bigbluebutton:2.2.0:beta4:*:*:*:*:*:*
    cpe:2.3:a:bigbluebutton:bigbluebutton:2.2.0:beta4:*:*:*:*:*:*
  • cpe:2.3:a:bigbluebutton:bigbluebutton:2.2.0:beta5:*:*:*:*:*:*
    cpe:2.3:a:bigbluebutton:bigbluebutton:2.2.0:beta5:*:*:*:*:*:*
  • cpe:2.3:a:bigbluebutton:bigbluebutton:2.2.0:beta6:*:*:*:*:*:*
    cpe:2.3:a:bigbluebutton:bigbluebutton:2.2.0:beta6:*:*:*:*:*:*
  • cpe:2.3:a:bigbluebutton:bigbluebutton:2.2.0:beta7:*:*:*:*:*:*
    cpe:2.3:a:bigbluebutton:bigbluebutton:2.2.0:beta7:*:*:*:*:*:*
  • cpe:2.3:a:bigbluebutton:bigbluebutton:2.2.0:beta8:*:*:*:*:*:*
    cpe:2.3:a:bigbluebutton:bigbluebutton:2.2.0:beta8:*:*:*:*:*:*
  • cpe:2.3:a:bigbluebutton:bigbluebutton:2.2.0:beta9:*:*:*:*:*:*
    cpe:2.3:a:bigbluebutton:bigbluebutton:2.2.0:beta9:*:*:*:*:*:*
  • cpe:2.3:a:bigbluebutton:bigbluebutton:2.2.0:beta10:*:*:*:*:*:*
    cpe:2.3:a:bigbluebutton:bigbluebutton:2.2.0:beta10:*:*:*:*:*:*
  • cpe:2.3:a:bigbluebutton:bigbluebutton:2.2.0:beta11:*:*:*:*:*:*
    cpe:2.3:a:bigbluebutton:bigbluebutton:2.2.0:beta11:*:*:*:*:*:*
  • cpe:2.3:a:bigbluebutton:bigbluebutton:2.2.0:beta12:*:*:*:*:*:*
    cpe:2.3:a:bigbluebutton:bigbluebutton:2.2.0:beta12:*:*:*:*:*:*
  • cpe:2.3:a:bigbluebutton:bigbluebutton:2.2.0:beta14:*:*:*:*:*:*
    cpe:2.3:a:bigbluebutton:bigbluebutton:2.2.0:beta14:*:*:*:*:*:*
  • cpe:2.3:a:bigbluebutton:bigbluebutton:2.2.0:beta15:*:*:*:*:*:*
    cpe:2.3:a:bigbluebutton:bigbluebutton:2.2.0:beta15:*:*:*:*:*:*
  • cpe:2.3:a:bigbluebutton:bigbluebutton:2.2.0:beta16:*:*:*:*:*:*
    cpe:2.3:a:bigbluebutton:bigbluebutton:2.2.0:beta16:*:*:*:*:*:*
  • cpe:2.3:a:bigbluebutton:bigbluebutton:2.2.0:beta17:*:*:*:*:*:*
    cpe:2.3:a:bigbluebutton:bigbluebutton:2.2.0:beta17:*:*:*:*:*:*
  • cpe:2.3:a:bigbluebutton:bigbluebutton:2.2.0:beta18:*:*:*:*:*:*
    cpe:2.3:a:bigbluebutton:bigbluebutton:2.2.0:beta18:*:*:*:*:*:*
  • cpe:2.3:a:bigbluebutton:bigbluebutton:2.2.0:beta19:*:*:*:*:*:*
    cpe:2.3:a:bigbluebutton:bigbluebutton:2.2.0:beta19:*:*:*:*:*:*
  • cpe:2.3:a:bigbluebutton:bigbluebutton:2.2.0:beta20:*:*:*:*:*:*
    cpe:2.3:a:bigbluebutton:bigbluebutton:2.2.0:beta20:*:*:*:*:*:*
  • cpe:2.3:a:bigbluebutton:bigbluebutton:2.2.0:beta21:*:*:*:*:*:*
    cpe:2.3:a:bigbluebutton:bigbluebutton:2.2.0:beta21:*:*:*:*:*:*
  • cpe:2.3:a:bigbluebutton:bigbluebutton:2.2.0:beta22:*:*:*:*:*:*
    cpe:2.3:a:bigbluebutton:bigbluebutton:2.2.0:beta22:*:*:*:*:*:*
  • cpe:2.3:a:bigbluebutton:bigbluebutton:2.2.0:beta23:*:*:*:*:*:*
    cpe:2.3:a:bigbluebutton:bigbluebutton:2.2.0:beta23:*:*:*:*:*:*
  • cpe:2.3:a:bigbluebutton:bigbluebutton:2.2.1:*:*:*:*:*:*:*
    cpe:2.3:a:bigbluebutton:bigbluebutton:2.2.1:*:*:*:*:*:*:*
  • cpe:2.3:a:bigbluebutton:bigbluebutton:2.2.2:*:*:*:*:*:*:*
    cpe:2.3:a:bigbluebutton:bigbluebutton:2.2.2:*:*:*:*:*:*:*
  • cpe:2.3:a:bigbluebutton:bigbluebutton:2.2.3:*:*:*:*:*:*:*
    cpe:2.3:a:bigbluebutton:bigbluebutton:2.2.3:*:*:*:*:*:*:*
  • cpe:2.3:a:bigbluebutton:bigbluebutton:2.2.4:*:*:*:*:*:*:*
    cpe:2.3:a:bigbluebutton:bigbluebutton:2.2.4:*:*:*:*:*:*:*
  • cpe:2.3:a:bigbluebutton:bigbluebutton:2.2.5:*:*:*:*:*:*:*
    cpe:2.3:a:bigbluebutton:bigbluebutton:2.2.5:*:*:*:*:*:*:*
  • cpe:2.3:a:bigbluebutton:bigbluebutton:2.2.6:*:*:*:*:*:*:*
    cpe:2.3:a:bigbluebutton:bigbluebutton:2.2.6:*:*:*:*:*:*:*
  • cpe:2.3:a:bigbluebutton:bigbluebutton:2.2.7:*:*:*:*:*:*:*
    cpe:2.3:a:bigbluebutton:bigbluebutton:2.2.7:*:*:*:*:*:*:*

CVSS3 Source

nvd@nist.gov

CVSS3 Type

Primary

CVSS3 Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

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