Microsoft Warns of New Unpatched Windows Print Spooler Vulnerability

Microsoft on Thursday shared contemporary steerage on however a further vulnerability affecting the Home windows Print Spooler assistance, stating that it is functioning to tackle it in an impending security update.

Tracked as CVE-2021-34481 (CVSS rating: 7.8), the concern considerations a community privilege escalation flaw that could be abused to perform unauthorized actions on the procedure. The company credited safety researcher Jacob Baines for exploring and reporting the bug.

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“An elevation of privilege vulnerability exists when the Windows Print Spooler provider improperly performs privileged file functions. An attacker who properly exploited this vulnerability could run arbitrary code with Procedure privileges,” the Home windows maker said in its advisory. “An attacker could then put in packages view, alter, or delete knowledge or produce new accounts with comprehensive user rights.”

Nevertheless, it’s truly worth pointing out that productive exploitation of the vulnerability calls for the attacker to have the capacity to execute code on a sufferer method. In other terms, this vulnerability can only be exploited domestically to acquire elevated privileges on a system.

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As workarounds, Microsoft is recommending customers to prevent and disable the Print Spooler assistance to protect against destructive actors from exploiting the vulnerability.

The growth will come times right after the Redmond-centered agency rolled out patches to address a critical shortcoming in the similar part that it disclosed as becoming actively exploited to phase in-the-wild assaults.

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Dubbed PrintNightmare (CVE-2021-34527), the vulnerability stems from a lacking authorization look at in the Print Spooler that allows the installation of destructive print drivers to achieve distant code execution or regional privilege escalation on vulnerable methods.

Nevertheless, it later emerged that the out-of-band security update could be entirely bypassed less than precise ailments to get equally nearby privilege escalation and distant code execution. Microsoft has since stated the fixes ended up “doing the job as built and is helpful in opposition to the regarded printer spooling exploits and other community studies collectively currently being referred to as PrintNightmare.”

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