Vulnerability Details : 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.
Vulnerability category: Denial of service
Products affected by CVE-2021-32623
- cpe:2.3:a:apereo:opencast:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2021-32623
0.07%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 31 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-32623
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
4.0
|
MEDIUM | AV:N/AC:L/Au:S/C:N/I:N/A:P |
8.0
|
2.9
|
NIST | |
|
6.5
|
MEDIUM | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
2.8
|
3.6
|
NIST | |
|
8.1
|
HIGH | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H |
2.8
|
5.2
|
GitHub, Inc. |
CWE ids for CVE-2021-32623
-
The product uses XML documents and allows their structure to be defined with a Document Type Definition (DTD), but it does not properly control the number of recursive definitions of entities.Assigned by: security-advisories@github.com (Primary)
References for CVE-2021-32623
-
https://github.com/opencast/opencast/commit/8ae27da5a6f658011a5741b3210e715b0dc6213e
Clarifies debug options in setenv file (#2735) · opencast/opencast@8ae27da · GitHubPatch;Third Party Advisory
-
https://github.com/opencast/opencast/security/advisories/GHSA-9gwx-9cwp-5c2m
Opencast vulnerable to billion laughs attack (XML bomb) · Advisory · opencast/opencast · GitHubExploit;Third Party Advisory
Jump to