Multiple vulnerabilities in HTTP.sys implementation in Microsoft Windows

Published: 2018-06-12 | Updated: 2022-08-16

Risk	High
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2018-8226 CVE-2018-8231
CWE-ID	CWE-20 CWE-119
Exploitation vector	Network
Public exploit	N/A
Vulnerable software Subscribe	Windows Operating systems & Components / Operating system Windows Server Operating systems & Components / Operating system Microsoft IIS Server applications / Web servers
Vendor	Microsoft

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Improper input validation

EUVDB-ID: #VU13295

Risk: Medium

CVSSv3.1: 6.4 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-8226

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to an error when processing HTTP 2.0 requests within the HTTP.sys driver. A remote attacker can send a specially crafted HTTP response to vulnerable system and crash it.

Successful exploitation of the vulnerability may allow an attacker to perform a denial of service attack.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Windows: 10

Windows Server: 2016 - 2019 1709

Microsoft IIS: 10.0

External links

http://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8226

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

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

2) Buffer overflow

EUVDB-ID: #VU13297

Risk: High

CVSSv3.1: 8.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-8231

CWE-ID: CWE-119 - Memory corruption