Microsoft Warns of New Unpatched Home windows Print Spooler Vulnerability


Microsoft on Thursday shared contemporary steerage on yet one more vulnerability affecting the Home windows Print Spooler service, stating that it is working to deal with it in an upcoming safety replace.

Tracked as CVE-2021-34481 (CVSS rating: 7.8), the difficulty issues a neighborhood privilege escalation flaw that may very well be abused to carry out unauthorized actions on the system. The corporate credited safety researcher Jacob Baines for locating and reporting the bug.

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“An elevation of privilege vulnerability exists when the Home windows Print Spooler service improperly performs privileged file operations. An attacker who efficiently exploited this vulnerability may run arbitrary code with SYSTEM privileges,” the Home windows maker mentioned in its advisory. “An attacker may then set up applications; view, change, or delete knowledge; or create new accounts with full person rights.”

Nonetheless, it is price declaring that profitable exploitation of the vulnerability requires the attacker to have the flexibility to execute code on a sufferer system. In different phrases, this vulnerability can solely be exploited regionally to achieve elevated privileges on a tool.

As workarounds, Microsoft is recommending customers to cease and disable the Print Spooler service to forestall malicious actors from exploiting the vulnerability.

The event comes days after the Redmond-based agency rolled out patches to deal with a crucial shortcoming in the identical element that it disclosed as being actively exploited to stage in-the-wild assaults.

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Dubbed PrintNightmare (CVE-2021-34527), the vulnerability stems from a lacking permission examine within the Print Spooler that permits the set up of malicious print drivers to attain distant code execution or native privilege escalation on susceptible techniques.

Nonetheless, it later emerged that the out-of-band safety replace may very well be solely bypassed beneath particular situations to achieve each native privilege escalation and distant code execution. Microsoft has since mentioned the fixes have been “working as designed and is efficient in opposition to the identified printer spooling exploits and different public experiences collectively being known as PrintNightmare.”


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