Microsoft Heightens Awareness of Zero-Day Bug

  • By Patrick Ryan
  • May 12, 2022

Microsoft is in the news for implementing a patch to combat the exploitation of an active zero-day bug. The patch in question also contains important fixes for several weaknesses within the cloud environment infrastructure. The software giant’s May patches amounted to 73.  

What is the Zero-Day Bug Patch all About?

Microsoft’s zero-day bug patch is especially notable as it helps prevent LSA spoofing. The company rates this digital security vulnerability as “important” as it is being taken advantage of through man-in-the-middle-style attacks.  

Microsoft’s monthly digital security patches are released every second week of each month. The company’s latest patch has fixes for more than half a dozen flaws that are considered “critical” and more than 60 others that are considered to be “important” in rating. Only one of the flaws has a “low” rating. Though 73 patches might seem like a high total for a single month, it is worth noting the software specialist issued a record number of patches in April.  

Out of the seven flaws considered “critical,” all but two permit remote code execution, or RCE. Two critical flaws open the door for hackers to elevate privileges to obtain unauthorized access to systems and files. The rest of the flaws are considered to be EoP and RCE bugs. Just under one-third of Microsoft’s flaws patched in May have been RCEs. EoP bugs represent about 29% of the company’s monthly fixes.

Shifting back to the LSA Spoofing Vulnerability, which is formally labeled as CVE-2022-26925, it is worth noting the bug is not considered to be critical. However, the bug has the potential to cause significant problems. If the LSA Spoofing Vulnerability is chained with the LAN manager attack relay and linked with an overarching attack chain, its potency significantly increases. There is the potential for the flaw to empower an unauthorized digital miscreant to coerce controllers of domains to authenticate servers controlled by attackers through NTLM. This exploit is occurring as a zero-day bug, which is a high priority for patching.

What RCE Flaws Have Microsoft’s Attention?

At the moment, Microsoft’s digital security specialists are especially concerned with four critically rated RCE vulnerabilities. These four flaws are located within an infrastructure used by businesses and organizations across a wide array of industries and spanning numerous cloud environments.  

The CVE-2022-29130 and CVE-2022-22012 RCE exploits are contained within the Microsoft LDAP service. However, these vulnerabilities can only be exploited if the value pertaining to the MaxReceiveBuffer LDAPpolicy is elevated above that which is default. Though elevating the MaxReceiveBuffer to a high value is not common, doing so is essential for digital defenses.

The other critical RCE flaw, tracked as CVE-2022-29972, requires patching through a cloud provider, meaning the onus is on organizations as opposed to Microsoft. Finally, there is another critical flaw in CVE-2022-26937 within the NFS, short for Network File System, that is problematic for Windows Servers 2008 through 2022. The vulnerability was recently addressed in a Microsoft bulletin pertaining to NFSV2 and NFSV3.

Stay tuned in the days and weeks ahead in case Microsoft’s digital security team issues more bulletins and other recommendations to help safeguard computers with Windows operating systems. Also, don’t forget to update your digital security protections with the industry’s latest solutions.
 

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