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CVE-2018-8581, also known as PrivExchange, is a Microsoft Exchange Server elevation of privilege vulnerability rooted in a server-side request forgery condition in the Exchange Web Services PushSubscription feature. By invoking the EWS PushSubscription mechanism, an authenticated attacker can cause Exchange to initiate outbound authentication to an attacker-controlled endpoint. In practical exploitation, this behavior can be combined with NTLM relay to impersonate other users and escalate privileges within the Windows domain or Exchange environment. The issue is widely characterized as an SSRF in Exchange's EWS PushSubscription functionality that becomes especially dangerous when chained with relay techniques against NTLM-authenticating services.
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2 valid exploits after Mallory filtered fakes, detection scripts, and README-only repos (1 hidden).
This repository contains an operational exploit for CVE-2018-8581, a privilege escalation and lateral movement vulnerability in Microsoft Exchange Server (2010 SP2/SP3, 2013, 2016). The exploit is implemented in Python 2.7 and consists of two main scripts: 'CVE-2018-8581.py' and 'CVE-2018-8581_debug.py', which are functionally similar, with the latter providing additional debug output. The exploit works by abusing Exchange Web Services (EWS) SOAP APIs to add or remove delegate access to a target mailbox, allowing an attacker with valid credentials to grant themselves access to another user's inbox (including administrators). The script also sets up a local HTTP server to relay NTLM authentication, potentially enabling further attacks if the environment is misconfigured. The README provides detailed usage instructions, configuration parameters, and describes the attack flow. The exploit targets Exchange servers accessible over the network and requires the attacker to have valid user credentials. The main endpoints involved are the EWS SOAP API on the Exchange server and an attacker-controlled HTTP server for NTLM relay.
This repository is a comprehensive Python exploit toolkit for the 'PrivExchange' attack (CVE-2018-8581), which targets Microsoft Exchange servers in Active Directory environments. The main entry point is 'Exchange2domain.py', which orchestrates the attack by running a relay server (HTTP) to capture NTLM authentication from Exchange and relay it to a Domain Controller (DC). The toolkit leverages the Impacket library and includes modules for relaying to various protocols (SMB, LDAP, HTTP, IMAP, MSSQL, SMTP) and performing post-exploitation actions such as dumping domain secrets (NTDS.dit), adding users, or escalating privileges. The repository contains both the exploit logic and supporting modules for protocol relaying and attack automation. The attack vector is network-based, requiring the attacker to be able to intercept and relay authentication traffic between Exchange and the DC. The exploit is operational and can be used to achieve full domain compromise if the target is vulnerable and properly configured.
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A high-severity elevation of privilege vulnerability in Microsoft Exchange Server, specifically affecting the EWS PushSubscription endpoint. Exploitation could allow an attacker to gain elevated privileges on the affected Exchange server.
Unknown
An elevation of privilege vulnerability in Microsoft Exchange Server that could allow an attacker to gain higher privileges on the server.
CVE-2018-8581 is an elevation of privilege vulnerability in Microsoft Exchange Server, also known as PrivExchange. It allows an attacker to perform NTLM relay attacks via the Exchange Web Services (EWS) interface, potentially leading to privilege escalation within the domain.
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