LocalS3 CreateBucketConfiguration Endpoint XML External Entity (XXE) Injection

LocalS3 is an Amazon S3 mock service for testing and local development. Prior to version 1.21, the LocalS3 service's bucket creation endpoint is vulnerable to XML External Entity (XXE) injection. When processing the CreateBucketConfiguration XML document during bucket creation, the service's XML parser is configured to resolve external entities. This allows an attacker to declare an external entity that references an internal URL, which the server will then attempt to fetch when parsing the XML. The vulnerability specifically occurs in the location constraint processing, where the XML parser resolves external entities without proper validation or restrictions. When the external entity is resolved, the server makes an HTTP request to the specified URL and includes the response content in the parsed XML document. This vulnerability can be exploited to perform server-side request forgery (SSRF) attacks, allowing an attacker to make requests to internal services or resources that should not be accessible from external networks. The server will include the responses from these internal requests in the resulting bucket configuration, effectively leaking sensitive information. The attacker only needs to be able to send HTTP requests to the LocalS3 service to exploit this vulnerability.

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XML外部实体引用的不恰当限制(XXE)

LocalS3 代码问题漏洞

LocalS3是Luo个人开发者的一个基于 Netty 的 Amazon S3 服务实现。 LocalS3 1.21之前版本存在代码问题漏洞，该漏洞源于存在XML外部实体注入漏洞，可能导致服务器端请求伪造攻击。

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