Deserialization of Untrusted Data Affecting org.keycloak:keycloak-ldap-federation package, versions [,26.4.6)

Affected versions of this package are vulnerable to Deserialization of Untrusted Data via the URL references when following referrals. An attacker can manipulate application behavior by configuring a malicious LDAP server and triggering deserialization of untrusted Java objects as an authenticated realm administrator.

Notes:

• This vulnerability can potentially result in JDNI references being used in case custom extensions were written for the library.
• The fix for this issue was also back-ported into 26.2.11 which has not been published to Maven Central.

Serialization is a process of converting an object into a sequence of bytes which can be persisted to a disk or database or can be sent through streams. The reverse process of creating object from sequence of bytes is called deserialization. Serialization is commonly used for communication (sharing objects between multiple hosts) and persistence (store the object state in a file or a database). It is an integral part of popular protocols like Remote Method Invocation (RMI), Java Management Extension (JMX), Java Messaging System (JMS), Action Message Format (AMF), Java Server Faces (JSF) ViewState, etc.

Deserialization of untrusted data (CWE-502) is when the application deserializes untrusted data without sufficiently verifying that the resulting data will be valid, thus allowing the attacker to control the state or the flow of the execution.

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