CVE Vulnerability

CVE-2021-32623

Opencast is a free and open source solution for automated video capture and distribution. Versions of Opencast prior to 9.6 are vulnerable to the billion laughs attack, which allows an attacker to easily execute a (seemingly permanent) denial of service attack, essentially taking down Opencast using a single HTTP request. To exploit this, users need to have ingest privileges, limiting the group of potential attackers The problem has been fixed in Opencast 9.6. There is no known workaround for this issue.

4 /10

CVSS v2.0 :

V3 Legend

Vector :

Exploitability : 8 / Impact : 2.9

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact PARTIAL

Scope

6.5 /10

CVSS v3.0 : MEDIUM

V3 Legend

Vector :

Exploitability : 2.8 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References
Link Resource
https://github.com/opencast/opencast/commit/8ae27da5a6f658011a5741b3210e715b0dc6213e Patch Third Party Advisory
https://github.com/opencast/opencast/security/advisories/GHSA-9gwx-9cwp-5c2m Exploit Third Party Advisory
Configurations

Configuration 1

cpe:2.3:a:apereo:opencast:*:*:*:*:*:*:*:*
Information

Published : 2021-06-16 12:15

Updated : 2021-06-23 07:55

NVD link : CVE-2021-32623

Mitre link : CVE-2021-32623

Products Affected
No products.
CWE
CWE-776

Improper Restriction of Recursive Entity References in DTDs ('XML Entity Expansion')