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Windows EPM Poisoning Exploit Chain Enables Domain Privilege Escalation

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📰 1 unique sources, 1 articles

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A now-patched vulnerability in Microsoft's Windows Remote Procedure Call (RPC) communication protocol, tracked as CVE-2025-49760, allowed attackers to perform spoofing attacks and impersonate known servers. This flaw enabled unprivileged users to achieve local/domain privilege escalation through an EPM poisoning attack. The exploit chain involved manipulating the Endpoint Mapper (EPM) to redirect RPC clients to malicious servers, leading to credential theft and privilege escalation. The vulnerability was disclosed by SafeBreach researcher Ron Ben Yizhak at DEF CON 33. Microsoft fixed the issue in July 2025 as part of its monthly Patch Tuesday update. The attack leveraged the lack of security checks in the EPM, allowing attackers to register interfaces of core services and hijack RPC communications.

Timeline

  1. 10.08.2025 15:31 📰 1 articles · ⏱ 1mo ago

    EPM Poisoning Exploit Chain in Windows RPC Disclosed

    A vulnerability in Windows RPC, tracked as CVE-2025-49760, allows EPM poisoning attacks that enable unprivileged users to impersonate legitimate servers and redirect RPC clients. The exploit chain involves manipulating the EPM to register interfaces of core services and hijack RPC communications, leading to credential theft and privilege escalation. The vulnerability was disclosed by SafeBreach researcher Ron Ben Yizhak at DEF CON 33 and was patched by Microsoft in July 2025. The attack can also be expanded to conduct AitM and DoS attacks.

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