MitM attack in Microsoft Windows TLS implementation

Published: 2019-10-09 | Updated: 2019-10-09
Severity Medium
Patch available YES
Number of vulnerabilities 1
CVE ID CVE-2019-1318
CWE ID CWE-300
Exploitation vector Local network
Public exploit N/A
Vulnerable software Windows Subscribe
Windows Server
Vendor Microsoft

Security Advisory

This security advisory describes one medium risk vulnerability.

1) Man-in-the-Middle (MitM) attack

Severity: Medium

CVSSv3: 5.3 [CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N/E:U/RL:O/RC:C] [PCI]

CVE-ID: CVE-2019-1318

CWE-ID: CWE-300 - Channel Accessible by Non-Endpoint ('Man-in-the-Middle')

Description

The vulnerability allows a remote attacker to perform MitM attack.

The vulnerability exists due an error when establishing a TLS session with a non- Extended Master Secret (EMS) peer. A remote attacker can perform MitM (man-in-the-middle) attack and decrypt data passed via TLS channel.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Windows: 7, 8.1, 10, 10 1607, 10 1703, 10 1709, 10 1803, 10 1809, 10 1903, RT 8.1

Windows Server: 1803, 1903, 2008, 2008 R2, 2012, 2012 R2, 2016, 2019

CPE External links

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-1318

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the local network (LAN).

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.