Deserialization of untrusted data in InternalAttributeHandler in pac4j

pac4j is a security framework for Java. `pac4j-core` prior to version 4.0.0 is affected by a Java deserialization vulnerability. The vulnerability affects systems that store externally controlled values in attributes of the `UserProfile` class from pac4j-core. It can be exploited by providing an attribute that contains a serialized Java object with a special prefix `{#sb64}` and Base64 encoding. This issue may lead to Remote Code Execution (RCE) in the worst case. Although a `RestrictedObjectInputStream` is in place, that puts some restriction on what classes can be deserialized, it still allows a broad range of java packages and potentially exploitable with different gadget chains. pac4j versions 4.0.0 and greater are not affected by this issue. Users are advised to upgrade. There are no known workarounds for this vulnerability.

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可信数据的反序列化

pac4j 代码问题漏洞

pac4j是pac4j开源的一个简单而强大的 Java 安全引擎。用于验证用户、获取他们的配置文件和管理授权，以保护 Web 应用程序和 Web 服务。 pac4j 4.0.0之前版本存在代码问题漏洞，该漏洞源于受到Java反序列化漏洞的影响，可能导致远程代码执行(RCE)。

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