Microsoft today rolled out updates to plug at least 56 security holes in its Windows operating systems and other software. One of the bugs is already being actively exploited, and six of them were publicized prior to today, potentially giving attackers a head start in figuring out how to exploit the flaws.
Nine of the 56 vulnerabilities earned Microsoft’s most urgent “critical” rating, meaning malware or miscreants could use them to seize remote control over unpatched systems with little or no help from users.
The flaw being exploited in the wild already — CVE-2021-1732 — affects Windows 10, Server 2016 and later editions. It received a slightly less dire “important” rating and mainly because it is a vulnerability that lets an attacker increase their authority and control on a device, which means the attacker needs to already have access to the target system.
Two of the other bugs that were disclosed prior to this week are critical and reside in Microsoft’s .NET Framework, a component required by many third-party applications (most Windows users will have some version of .NET installed).
Windows 10 users should note that while the operating system installs all monthly patch roll-ups in one go, that rollup does not typically include .NET updates, which are installed on their own. So when you’ve backed up your system and installed this month’s patches, you may want to check Windows Update again to see if there are any .NET updates pending.
A key concern for enterprises is another critical bug in the DNS server on Windows Server 2008 through 2019 versions that could be used to remotely install software of the attacker’s choice. CVE-2021-24078 earned a CVSS Score of 9.8, which is about as dangerous as they come.
Recorded Future says this vulnerability can be exploited remotely by getting a vulnerable DNS server to query for a domain it has not seen before (e.g. by sending a phishing email with a link to a new domain or even with images embedded that call out to a new domain). Kevin Breen of Immersive Labs notes that CVE-2021-24078 could let an attacker steal loads of data by altering the destination for an organization’s web traffic — such as pointing internal appliances or Outlook email access at a malicious server.
Windows Server users also should be aware that Microsoft this month is enforcing the second round of security improvements as part of a two-phase update to address CVE-2020-1472, a severe vulnerability that first saw active exploitation back in September 2020.
The vulnerability, dubbed “Zerologon,” is a bug in the core “Netlogon” component of Windows Server devices. The flaw lets an unauthenticated attacker gain administrative access to a Windows domain controller and run any application at will. A domain controller is a server that responds to security authentication requests in a Windows environment, and a compromised domain controller can give attackers the keys to the kingdom inside a corporate network.
Microsoft’s initial patch for CVE-2020-1472 fixed the flaw on Windows Server systems, but did nothing to stop unsupported or third-party devices from talking to domain…