Microsoft Security Response Center

**How could an attacker exploit this vulnerability?** An unauthenticated attacker could perform a man-in-the-middle network exploit to downgrade a client's encryption to the RC4-md4 cypher, followed by cracking the user's cypher key. The attacker could then compromise the user's Kerberos session key to elevate privileges.

**What type of information could be disclosed by this vulnerability?** An attacker who successfully exploited this vulnerability could potentially read small portions of heap memory.

**How could an attacker exploit this vulnerability?** An authenticated attacker with normal privileges could send a modified XPS file to a shared printer, which can result in a remote code execution.

**What type of information could be disclosed by this vulnerability?** An attacker who successfully exploited this vulnerability could potentially read small portions of heap memory.

**How could an attacker exploit this vulnerability?** To exploit this vulnerability, an attacker on the same subnet as the target system would need to send a specially crafted packet to a server configured as a Network Load Balancing cluster host.

Mitigation refers to a setting, common configuration, or general best-practice, existing in a default state, that could reduce the severity of exploitation of a vulnerability. The following mitigating factors might be helpful in your situation: Only systems with the IKE and AuthIP IPsec Keying Modules running are vulnerable to this attack. You can run either of the following commands to check the running status of this service: PS: C:\> Get-Service Ikeext * OR Cmd: C:\> sc query ikeext This mitigation could have negative affects on your IPSec functionality. Microsoft strongly recommends updating your system with the latest Windows security updates.

**According to the CVSS metric, user interaction is required (UI:R). What interaction would the user have to do?** An attacker must send the user a malicious input file and convince the user to open said input file.

**What privileges could be gained by an attacker who successfully exploited this vulnerability?** An attacker who successfully exploited this vulnerability could gain SYSTEM privileges.

**What kind of security feature could be bypassed by successfully exploiting this vulnerability?** An attacker who successfully exploited this vulnerability could bypass the Windows Lock Screen security feature.

**Does this vulnerability affect all versions of TLS?** No. Only those devices running TLS 1.3 are affected. For more information on supported TLS implementations please visit: https://learn.microsoft.com/en-us/windows/win32/secauthn/protocols-in-tls-ssl--schannel-ssp-