Threat Signal Report

Known Active Exploitation of Windows CSRSS Elevation of Privilege Vulnerability (CVE-2022-22047)

description-logo Description

FortiGuard Labs is aware of a newly reported and actively exploited zero day targeting Microsoft Windows and Windows Server (Windows CSRSS Elevation of Privilege Vulnerability). Assigned CVE-2022-22047, this vulnerability was discovered by Microsoft internally and credited to the Microsoft Security Response Center. As this vulnerability was disclosed by Microsoft, details surrounding this exploit are limited. Attackers successfully exploiting this vulnerability will gain SYSTEM privileges. Patches for this vulnerability were rolled out in this month's July 2022 release, which addresses 84 known vulnerabilities.


US-CERT (CISA) has added CVE-2022-22047 to its recently published Known Exploited Vulnerabilities Catalog. A link can be found in the APPENDIX section.


Is this Being Exploited in the Wild?

Yes. Microsoft has confirmed reports of active exploitation.


How Serious of a Vulnerability is this?

Medium. This is due to the vulnerability not being remotely exploitable and a patch being available.


What is the CVSS score for this issue?

7.8


Is this Vulnerability Remotely Exploitable?

No. This is a local vulnerability.


How is this Vulnerability Actively Being Exploited if it is a Local Vulnerability?

Although there is no further information on exploitation released by Microsoft, it can be surmised that an unknown remote code execution allowed for an attacker to perform lateral movement and escalate privileges on machines vulnerable to CVE-2022-22047, ultimately allowing for SYSTEM privileges.


What Operating Systems are Affected?

Microsoft Windows 7,8,10,11 and Microsoft Windows Server 2012 and 2008 versions are affected.


Is there a Patch Available?

Yes. A patch was included in this months Microsoft July 2022 update.


What Protections are Available?

Fortinet customers running the latest (IPS) definitions are currently protected against CVE-2022-22047 by the following signature:


MS.Windows.CVE-2022-22047.Privilege.Elevation


Telemetry


Definitions

Traffic Light Protocol

Color When Should it Be used? How may it be shared?

TLP: RED

Not for disclosure, restricted to participants only.
Sources may use TLP:RED when information cannot be effectively acted upon by additional parties, and could lead to impacts on a party's privacy, reputation, or operations if misused. Recipients may not share TLP:RED information with any parties outside of the specific exchange, meeting, or conversation in which it was originally disclosed. In the context of a meeting, for example, TLP:RED information is limited to those present at the meeting. In most circumstances, TLP:RED should be exchanged verbally or in person.

TLP: AMBER

Limited disclosure, restricted to participants’ organizations.
Sources may use TLP:AMBER when information requires support to be effectively acted upon, yet carries risks to privacy, reputation, or operations if shared outside of the organizations involved. Recipients may only share TLP:AMBER information with members of their own organization, and with clients or customers who need to know the information to protect themselves or prevent further harm. Sources are at liberty to specify additional intended limits of the sharing: these must be adhered to.

TLP: GREEN

Limited disclosure, restricted to the community.
Sources may use TLP:GREEN when information is useful for the awareness of all participating organizations as well as with peers within the broader community or sector. Recipients may share TLP:GREEN information with peers and partner organizations within their sector or community, but not via publicly accessible channels. Information in this category can be circulated widely within a particular community. TLP:GREEN information may not be released outside of the community.

TLP: WHITE

Disclosure is not limited.
Sources may use TLP:WHITE when information carries minimal or no foreseeable risk of misuse, in accordance with applicable rules and procedures for public release. Subject to standard copyright rules, TLP:WHITE information may be distributed without restriction.