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

2021-06-1523:45:10

CWE-776

GitHub_M

www.cve.org

8.1 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

HIGH

Availability Impact

HIGH

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

0.001 Low

EPSS

Percentile

31.9%

JSON

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.

CNA Affected

[
  {
    "product": "opencast",
    "vendor": "opencast",
    "versions": [
      {
        "status": "affected",
        "version": "< 9.6"
      }
    ]
  }
]