Open Redirect or SSRF vulnerability usage of parseURL

Vulnerability

A flaw in Apache Dubbo's parseURL method allows an attacker to bypass the host whitelist check, leading to open redirect or server-side request forgery (SSRF). The vulnerability affects all versions prior to 2.6.9 and 2.7.9 [1]. The code path is reachable when Dubbo's URL parsing logic is invoked, typically via RPC calls that include a maliciously crafted URL parameter.

Exploitation

An attacker with network access to a Dubbo service can craft an RPC request containing a specially crafted URL that, when processed by the parseURL method, bypasses the host whitelist validation. The attacker does not require authentication or any special privileges, as the vulnerability is triggered during normal URL parsing operations [1]. No user interaction is needed beyond the service processing the malicious request.

Impact

Successful exploitation can result in an open redirect, where the attacker forces the Dubbo server to redirect a client to an external malicious site, or an SSRF attack, allowing the server to make requests to internal or external resources, potentially leading to further compromise of internal systems. The attacker gains the ability to control the destination of server-side HTTP requests, which can lead to information disclosure or lateral movement within the network [1].

Mitigation

Apache Dubbo has released fixed versions 2.6.9 and 2.7.9 that address this vulnerability. Users are strongly advised to upgrade to these versions or later. The fix ensures that the parseURL method properly validates the host against the whitelist, preventing bypass [1]. No known workarounds exist. This CVE is not listed in the Known Exploited Vulnerabilities (KEV) catalog.