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CVE-2021-3856

Good to know:

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Date: August 26, 2022

ClassLoaderTheme and ClasspathThemeResourceProviderFactory allows reading any file available as a resource to the classloader. By sending requests for theme resources with a relative path from an external HTTP client, the client will receive the content of random files if available.

Language: Java

Severity Score

Related Resources (8)

https://nvd.nist.gov/vuln/detail/CVE-2021-3856
https://github.com/keycloak/keycloak/pull/8588
https://issues.redhat.com/browse/KEYCLOAK-19422
https://github.com/keycloak/keycloak/commit/73f0474008e1bebd0733e62a22aceda9e5de6743
https://bugzilla.redhat.com/show_bug.cgi?id=2010164
https://access.redhat.com/security/cve/CVE-2021-3856
https://github.com/keycloak/keycloak
https://www.mend.io/vulnerability-database/CVE-2021-3856

Severity Score

Weakness Type (CWE)

Files or Directories Accessible to External Parties

CWE-552

Path Traversal

CWE-22

Top Fix

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): LOW
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): LOW
Integrity (I): NONE
Availability (A): NONE

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