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CVE-2021-32623— Opencast vulnerable to billion laughs attack (XML bomb)

Quick assessment

Affected
opencast opencast
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Opencast是Opencast组织的一款用于大规模自动视频捕获，管理和分发的直播视频支撑软件。 Opencast 9.6版本及之前版本存在安全漏洞，该漏洞源于Opencast很容易受到the billion laughs attack（一种DoS攻击）。

CVSS 8.1 · High EPSS 1.25% · P69

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2021-32623

Vulnerability Information
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Vulnerability Title
Opencast vulnerable to billion laughs attack (XML bomb)
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
DTD中递归实体索引的不恰当限制(XML实体扩展)
Source: CVE Program / CVE List V5
Vulnerability Title
Opencast 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Opencast是Opencast组织的一款用于大规模自动视频捕获，管理和分发的直播视频支撑软件。 Opencast 9.6版本及之前版本存在安全漏洞，该漏洞源于Opencast很容易受到the billion laughs attack（一种DoS攻击）。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
opencast opencast < 9.6 -

II. Public POCs for CVE-2021-32623

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III. Intelligence Information for CVE-2021-32623

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Patches & Fixes for CVE-2021-32623 (1)

Vendor Advisories for CVE-2021-32623 (1)

IV. Related Vulnerabilities

Same product: opencast
Same vendor: opencast
Same weakness: CWE-776

V. Comments for CVE-2021-32623

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