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To commemorate Patch Tuesday in January 2023, Microsoft launched patches for 98 CVE-numbered vulnerabilities, together with one exploited within the wild (CVE-2023-21674) and one other (CVE-2023-21549) that has been publicly disclosed. Each permit attackers to raise privileges on the weak machine.

Word Vulnerabilities

CVE-2023-21674 is a vulnerability in Home windows Superior Native Process Name (ALPC) that would result in a browser sandbox escape and permit attackers to achieve SYSTEM privileges on all kinds of Home windows and Home windows installations. Server.

“Bugs like this are sometimes mixed with some type of code required to ship malware or ransomware. Provided that this was reported to Microsoft by Avast researchers, that state of affairs appears possible right here,” mentioned Dustin Childs of Pattern Micro. Patching this one up ought to be a precedence.

Based on Satnam Narang, a senior analysis engineer on Tenable employees, vulnerabilities like CVE-2023-21674 are sometimes the work of Superior Persistent Risk (APT) teams as a part of focused assaults. “The chance of future widespread exploitation of an exploit chain like that is restricted as a result of automated replace performance used to patch browsers,” he added.

The one publicly disclosed vulnerability, CVE-2023-21549, within the Home windows SMB Witness, seems to be much less prone to be exploited within the newest variations of Home windows and Home windows Server, though the complexity of the assault and the privileges required are low and the vulnerability isn’t wanted. consumer interplay.

“To take advantage of this vulnerability, an attacker might run a specifically crafted malicious script that executes an RPC name to an RPC host. This might lead to an elevation of privileges on the server. An attacker who efficiently exploited this vulnerability might execute RPC capabilities which are restricted to solely privileged accounts,” Microsoft defined.

However whereas CVE-2023-21549 could also be a patching precedence for some, CVE-2023-21743, a safety characteristic circumvention vulnerability in Microsoft SharePoint Server, ought to be rapidly remedied by many.

“You not often see a safety characteristic bypass (SFB) rated essential, however this one appears to qualify. This bug might permit an unauthenticated distant attacker to make an nameless connection to an affected SharePoint server,” Childs famous, stressing that system directors also needs to set off a SharePoint replace motion to be totally protected in opposition to this vulnerability.

“The attacker can bypass the safety in SharePoint by blocking the HTTP request primarily based on the IP vary. If an attacker efficiently exploits this vulnerability, they’ll validate the presence or absence of an HTTP endpoint throughout the blocked IP vary. Moreover, the vulnerability requires the attacker to have learn entry to the goal Sharepoint website,” mentioned Preetham Gurram, senior product supervisor at Automox.

Directors in control of patching on-premises Microsoft Trade servers should act rapidly to patch two EoP vulnerabilities (CVE-2023-21763/CVE-2023-21764) stemming from a failed patch launched in November 2022.

The remainder of the patches are supposed to appropriate vulnerabilities in Home windows Print Spooler (certainly one of them has been reported by the NSA), the Home windows kernel and different options. There are additionally two attention-grabbing flaws (CVE-2023-21560, CVE-2023-21563) that permit attackers to bypass the BitLocker Machine Encryption characteristic on the system storage machine to achieve entry to encrypted knowledge, however provided that they’re bodily current. .

The tip of the highway to the protected use of Home windows 7

Lastly, it have to be reiterated as soon as once more that right now Microsoft has ended prolonged safety help for Home windows 7.

“It has been three years since Microsoft started its Prolonged Safety Replace (ESU) program for Home windows 7 and Server 2008/2008 R2 and the ultimate safety updates for these working programs will probably be launched subsequent week. Whereas they may proceed to work nicely previous the deadline, new vulnerabilities will proceed to be found and these programs will run with rising threat of exploitation,” mentioned Todd Schell, senior product supervisor, safety at Ivanti.

Microsoft has provided a number of choices for these trying to swap from Home windows 7, relying on the {hardware} of the machines.

The prolonged finish date for Home windows 8.1 can be right now. “After this date, this product will now not obtain safety updates, non-security updates, bug fixes, technical help, or on-line technical content material updates,” Microsoft famous.

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Microsoft plugs actively exploited zero-day hole (CVE-2023-21674)

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