According to the CVSS metric, the attack vector is adjacent (AV:A). What does that mean for this vulnerability? This vulnerability's attack is limited at the protocol level to a logically adjacent topology. This means it cannot simply be done across the internet, but instead needs something specific tied to the target. Good examples would include the same shared physical network (such as Bluetooth or IEEE 802.11), logical network (local IP subnet), or from within a secure or otherwise limited administrative domain (MPLS, secure VPN to an administrative network zone). This is common to many attacks that require machine-in-the-middle (MITM) type setups or that rely on initially gaining a foothold in another environment. What type of information could be disclosed by this vulnerability? Exploiting this vulnerability could allow the disclosure of NTLM hashes. According to the CVSS metric, privileges required is low (PR:L). Does the attacker need to be in an authenticated role on the Exchange Server? Yes, the attacker must be authenticated. According to the CVSS metric, successful exploitation of this vulnerability could lead to total loss of availability (A:H)? What does that mean for this vulnerability? If the attack is successful it could lead to a NTLM relay allowing for controls that would be able to block availability of a resource.
Piotr Bazydlo (@chudypb) of <a href="https://www.zerodayinitiative.com/">Trend Micro Zero Day Initiative</a>, <a href="https://github.com/zcgonvh">zcgonvh</a> with 360 noah lab