Threat Signal Report

Microsoft Patch Tuesday Fixed 0-day Arbitrary Code Execution Vulnerability (CVE-2022-34713)

description-logo Description

Microsoft has released 141 security fixes for this month's August 2022 release. Besides the usual security fixes, there was a zero-day of note:


CVE-2022-34713: This is a vulnerability in Microsoft Support Diagnostic Tool (MSDT). Microsoft confirmed in their advisory that the vulnerability was exploited in the wild as a zero-day. CVE-2022-34713 is an arbitrary code execution (ACE) vulnerability, which requires user interaction. As such an user need to open a specifically crafted file or visit a specially designed Web site to be exploited. This has a CVSS score of 7.8 and is rated important.


Why is this Significant?

This is significant as Microsoft observed CVE-2022-34713 was exploited as a 0-day in the wild. Because the exploitation requires user interaction, an attacker likely uses social engineering to get users to open a specifically crafted file or visit a specially designed Web site for exploitation.


How Widespread is the Attack that Leverages CVE-2022-34713?

At this time, there is no information available as to how widespread the attack is. However, since the vulnerability was publicly disclosed, attacks that leverage CVE-2022-34713 may increase.


Also, a similar vulnerability in MSDT (CVE-2022-30190, also known as Follina) that was patched in June 2022 by Microsoft is widely exploited in the wild. This is another indicator that likelihood of CVE-2022-34713 exploitation will likely increase.


FortiGuard Labs previously released a Threat Signal for CVE-2022-30190 (Follina). See the Appendix for a link to "Follina: 0-day Windows MSDT Vulnerability (CVE-2022-30190) Exploited In The Wild".


Is there Any Other Vulnerability in the August Patch Tuesday that Requires Attention?

Microsoft also released a patch for another vulnerability in MSDT (CVE-2022-35743). While the vulnerability was not reported nor observed to have been exploited in the wild, the Microsoft advisory states that exploitation is likely to occur. As such a patch for CVE-2022-35743 should also be applied as soon as possible. This has a CVSS score of 7.8 and is rated important.


Has Microsoft Released Security Advisories for CVE-2022-34713?

Yes, Microsoft has issued an advisory for the vulnerability. See the Appendix for a link to "CVE-2022-34713: Microsoft Windows Support Diagnostic Tool (MSDT) Remote Code Execution Vulnerability".


Has Microsoft Released a Patch for CVE-2022-34713?

Yes, Microsoft has released a patch for CVE-2022-34713 on August 9th, 2022 as part of regular MS Tuesday for the month.


What is the Status of Coverage?

Fortinet customers running the latest (IPS) definitions are currently protected against CVE-2022-34713 by the following signature:


MS.MSDT.diagcab.Handling.Directory.Traversal (default action is set to pass)

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.