Microsoft’s April 2023 Patch Tuesday Addresses 97 CVEs (CVE-2023-28252)

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 Microsoft addresses 97 CVEs, including one that was exploited in the wild as a zero day.





CVE-2023-28252 | Windows Common Log File System Driver Elevation of Privilege Vulnerability


CVE-2023-28252 is an EoP vulnerability in the Windows Common Log File System (CLFS) Driver, a logging service used by kernel-mode and user-mode applications. 

It was assigned a CVSSv3 score of 7.8. This vulnerability is a post-compromise flaw, meaning an attacker could exploit it after gaining access to a vulnerable target. 

Successful exploitation would elevate an attacker’s privileges SYSTEM. According to Microsoft, it was exploited in the wild as a zero day. 

Its discovery is attributed to Genwei Jiang of Mandiant and Quan Jin with DBAPPSecurity WeBin Lab.


CVE-2023-28252 is the second CLFS Driver EoP vulnerability to be exploited in the wild in 2023, as CVE-2023-23376 was disclosed in the February 2023 Patch Tuesday. 

It is the fourth known CLFS EoP vulnerability to be exploited in the wild in the last two years, following CVE-2022-24521 from the April 2022 Patch Tuesday 

and CVE-2022-37969 from the September 2022 Patch Tuesday release. CVE-2022-37969 was also disclosed to Microsoft by Wang and Jin, though it is unclear if there is any connection between both flaws.


CVE-2023-21554 | Microsoft Message Queuing Remote Code Execution Vulnerability

CVE-2023-21554 is a RCE vulnerability affecting Microsoft Message Queuing (MSMQ) with a CVSSv3 score of 9.8. An attacker could exploit this flaw by sending a specially crafted MSMQ packet to an affected MSMQ server. Microsoft’s advisory notes that exploitation of this flaw requires the Windows message queuing service to be enabled. 

When enabled, TCP port 1801 will be listening on the host.

In addition to this RCE flaw, two denial of service CVEs (CVE-2023-21769 and CVE-2023-28302) rated as “important” were also patched in MSMQ this month.

CVE-2023-28250 | Windows Pragmatic General Multicast (PGM) Remote Code Execution Vulnerability

CVE-2023-28250 is a RCE vulnerability affecting Windows Pragmatic General Multicast (PGM). Successful exploitation requires the MSMQ service to be enabled. 

An attacker could exploit this flaw by sending a crafted file over the network in order to execute arbitrary code. This vulnerability has a CVSSv3 score of 9.8 and impacts 

supported versions of Windows including Server Core installations.

CVE-2023-28231 | DHCP Server Service Remote Code Execution Vulnerability

CVE-2023-28231 is a RCE vulnerability affecting the Dynamic Host Configuration Protocol (DHCP) server service. Microsoft rates this vulnerability as 

“Exploitation More Likely” according to the Microsoft Exploitability Index. With a CVSSv3 score of 8.8, successful exploitation requires an attacker to be on an adjacent 

network prior to using a crafted RPC call to exploit the flaw.

Microsoft Exchange Server 2013 End Of Life

Microsoft announced that Exchange Server 2013 has reached its end of life. This version of Exchange Server will no longer receive security updates and should be upgraded as soon as possible. Microsoft released guidance to assist customers with decommissioning Exchange Server 2013. As we noted in our 2022 Threat Landscape Report, Microsoft Exchange was a major target in 2022, with at least 10 ransomware groups targeting vulnerabilities affecting the popular mail server. In fact, the ProxyShell chain of vulnerabilities affecting Microsoft Exchange were highlighted in our top five vulnerabilities of the year.

To assist organizations in identifying unsupported versions of Microsoft Exchange Server, the following plugins are available:

Plugin ID 22313: Microsoft Exchange Server Unsupported Version Detection

Plugin ID 10880: Microsoft Exchange Server Unsupported Version Detection (Uncredentialed)

Reference 

1- https://www.tenable.com/blog/microsofts-april-2023-patch-tuesday-addresses-97-cves-cve-2023-28252

EB

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