SB2018061219 - Multiple vulnerabilities in HTTP.sys implementation in Microsoft Windows

Description

This security bulletin contains information about 2 secuirty vulnerabilities.

1) Improper input validation (CVE-ID: CVE-2018-8226)

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.

2) Buffer overflow (CVE-ID: CVE-2018-8231)

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to boundary error within the HTTP Protocol Stack (Http.sys). A remote unauthenticated attacker can send a specially crafted packet to a targeted Http.sys server, trigger memory corruption and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Remediation

Install update from vendor's website.

References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8226
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8231