Colin Mc Hugo

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Colin Mc Hugo
Security Engineer Manager & CEO at Quantum Infinite Solutions Group Ltd.
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Cyber Security Incident Response
Management & Architecture of Cyber Security Teams
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  • Cyber Security Incident Response
  • Management & Architecture of Cyber Security Teams
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Microsoft Warns of New Unpatched Windows Print Spooler Vulnerability

July 22, 2021

Microsoft on Thursday shared recent steering 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 problem considerations a neighborhood privilege escalation flaw that could possibly 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 might run arbitrary code with SYSTEM privileges,” the Home windows maker mentioned in its advisory. “An attacker might then set up packages; view, change, or delete information; or create new accounts with full person rights.”

Nonetheless, it is value 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 stop 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 part that it disclosed as being actively exploited to stage in-the-wild assaults, making it the third printer-related flaw to come back to gentle in current weeks.

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Dubbed PrintNightmare (CVE-2021-34527), the vulnerability stems from a lacking permission verify 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 could possibly be totally bypassed beneath particular situations to achieve each native privilege escalation and distant code execution. Microsoft has since mentioned the fixes are “working as designed and is efficient in opposition to the recognized printer spooling exploits and different public experiences collectively being known as PrintNightmare.”

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