{"id":50634,"date":"2023-02-16T15:27:02","date_gmt":"2023-02-16T15:27:02","guid":{"rendered":"https:\/\/packetstormsecurity.com\/news\/view\/34332\/Two-Zero-Days-Fixed-In-Patch-Tuesday-Can-Escalate-Privileges-To-SYSTEM.html"},"modified":"2023-02-16T15:27:02","modified_gmt":"2023-02-16T15:27:02","slug":"two-zero-days-fixed-in-patch-tuesday-can-escalate-privileges-to-system","status":"publish","type":"post","link":"https:\/\/www.threatshub.org\/blog\/two-zero-days-fixed-in-patch-tuesday-can-escalate-privileges-to-system\/","title":{"rendered":"Two Zero-Days Fixed In Patch Tuesday Can Escalate Privileges To SYSTEM"},"content":{"rendered":"<div><img decoding=\"async\" src=\"https:\/\/files.scmagazine.com\/wp-content\/uploads\/2023\/02\/021523_bug_fixes.jpg\" class=\"ff-og-image-inserted\"><\/div>\n<p>A day after the February <a rel=\"noreferrer noopener\" href=\"https:\/\/www.ivanti.com\/blog\/february-2023-patch-tuesday\" target=\"_blank\">Patch Tuesday<\/a>, security researchers indicated that two of the three Microsoft CVEs that made the <a rel=\"noreferrer noopener\" href=\"https:\/\/www.cisa.gov\/known-exploited-vulnerabilities-catalog\" target=\"_blank\">C<\/a><a rel=\"noreferrer noopener\" href=\"https:\/\/www.cisa.gov\/known-exploited-vulnerabilities-catalog\" target=\"_blank\">y<\/a><a rel=\"noreferrer noopener\" href=\"https:\/\/www.cisa.gov\/known-exploited-vulnerabilities-catalog\" target=\"_blank\">b<\/a><a rel=\"noreferrer noopener\" href=\"https:\/\/www.cisa.gov\/known-exploited-vulnerabilities-catalog\" target=\"_blank\">e<\/a><a rel=\"noreferrer noopener\" href=\"https:\/\/www.cisa.gov\/known-exploited-vulnerabilities-catalog\" target=\"_blank\">r<\/a><a rel=\"noreferrer noopener\" href=\"https:\/\/www.cisa.gov\/known-exploited-vulnerabilities-catalog\" target=\"_blank\">s<\/a><a rel=\"noreferrer noopener\" href=\"https:\/\/www.cisa.gov\/known-exploited-vulnerabilities-catalog\" target=\"_blank\">e<\/a><a rel=\"noreferrer noopener\" href=\"https:\/\/www.cisa.gov\/known-exploited-vulnerabilities-catalog\" target=\"_blank\">c<\/a><a rel=\"noreferrer noopener\" href=\"https:\/\/www.cisa.gov\/known-exploited-vulnerabilities-catalog\" target=\"_blank\">u<\/a><a rel=\"noreferrer noopener\" href=\"https:\/\/www.cisa.gov\/known-exploited-vulnerabilities-catalog\" target=\"_blank\">r<\/a><a rel=\"noreferrer noopener\" href=\"https:\/\/www.cisa.gov\/known-exploited-vulnerabilities-catalog\" target=\"_blank\">i<\/a><a rel=\"noreferrer noopener\" href=\"https:\/\/www.cisa.gov\/known-exploited-vulnerabilities-catalog\" target=\"_blank\">t<\/a><a rel=\"noreferrer noopener\" href=\"https:\/\/www.cisa.gov\/known-exploited-vulnerabilities-catalog\" target=\"_blank\">y<\/a><a rel=\"noreferrer noopener\" href=\"https:\/\/www.cisa.gov\/known-exploited-vulnerabilities-catalog\" target=\"_blank\">I<\/a><a rel=\"noreferrer noopener\" href=\"https:\/\/www.cisa.gov\/known-exploited-vulnerabilities-catalog\" target=\"_blank\">n<\/a><a rel=\"noreferrer noopener\" href=\"https:\/\/www.cisa.gov\/known-exploited-vulnerabilities-catalog\" target=\"_blank\">f<\/a><a rel=\"noreferrer noopener\" href=\"https:\/\/www.cisa.gov\/known-exploited-vulnerabilities-catalog\" target=\"_blank\">r<\/a><a rel=\"noreferrer noopener\" href=\"https:\/\/www.cisa.gov\/known-exploited-vulnerabilities-catalog\" target=\"_blank\">a<\/a><a rel=\"noreferrer noopener\" href=\"https:\/\/www.cisa.gov\/known-exploited-vulnerabilities-catalog\" target=\"_blank\">s<\/a><a rel=\"noreferrer noopener\" href=\"https:\/\/www.cisa.gov\/known-exploited-vulnerabilities-catalog\" target=\"_blank\">t<\/a><a rel=\"noreferrer noopener\" href=\"https:\/\/www.cisa.gov\/known-exploited-vulnerabilities-catalog\" target=\"_blank\">r<\/a><a rel=\"noreferrer noopener\" href=\"https:\/\/www.cisa.gov\/known-exploited-vulnerabilities-catalog\" target=\"_blank\">u<\/a><a rel=\"noreferrer noopener\" href=\"https:\/\/www.cisa.gov\/known-exploited-vulnerabilities-catalog\" target=\"_blank\">c<\/a><a rel=\"noreferrer noopener\" href=\"https:\/\/www.cisa.gov\/known-exploited-vulnerabilities-catalog\" target=\"_blank\">t<\/a><a rel=\"noreferrer noopener\" href=\"https:\/\/www.cisa.gov\/known-exploited-vulnerabilities-catalog\" target=\"_blank\">u<\/a><a rel=\"noreferrer noopener\" href=\"https:\/\/www.cisa.gov\/known-exploited-vulnerabilities-catalog\" target=\"_blank\">r<\/a><a rel=\"noreferrer noopener\" href=\"https:\/\/www.cisa.gov\/known-exploited-vulnerabilities-catalog\" target=\"_blank\">e<\/a><a rel=\"noreferrer noopener\" href=\"https:\/\/www.cisa.gov\/known-exploited-vulnerabilities-catalog\" target=\"_blank\">a<\/a><a rel=\"noreferrer noopener\" href=\"https:\/\/www.cisa.gov\/known-exploited-vulnerabilities-catalog\" target=\"_blank\">n<\/a><a rel=\"noreferrer noopener\" href=\"https:\/\/www.cisa.gov\/known-exploited-vulnerabilities-catalog\" target=\"_blank\">d<\/a><a rel=\"noreferrer noopener\" href=\"https:\/\/www.cisa.gov\/known-exploited-vulnerabilities-catalog\" target=\"_blank\">S<\/a><a rel=\"noreferrer noopener\" href=\"https:\/\/www.cisa.gov\/known-exploited-vulnerabilities-catalog\" target=\"_blank\">e<\/a><a rel=\"noreferrer noopener\" href=\"https:\/\/www.cisa.gov\/known-exploited-vulnerabilities-catalog\" target=\"_blank\">c<\/a><a rel=\"noreferrer noopener\" href=\"https:\/\/www.cisa.gov\/known-exploited-vulnerabilities-catalog\" target=\"_blank\">u<\/a><a rel=\"noreferrer noopener\" href=\"https:\/\/www.cisa.gov\/known-exploited-vulnerabilities-catalog\" target=\"_blank\">r<\/a><a rel=\"noreferrer noopener\" href=\"https:\/\/www.cisa.gov\/known-exploited-vulnerabilities-catalog\" target=\"_blank\">i<\/a><a rel=\"noreferrer noopener\" href=\"https:\/\/www.cisa.gov\/known-exploited-vulnerabilities-catalog\" target=\"_blank\">t<\/a><a rel=\"noreferrer noopener\" href=\"https:\/\/www.cisa.gov\/known-exploited-vulnerabilities-catalog\" target=\"_blank\">y<\/a><a rel=\"noreferrer noopener\" href=\"https:\/\/www.cisa.gov\/known-exploited-vulnerabilities-catalog\" target=\"_blank\">A<\/a><a rel=\"noreferrer noopener\" href=\"https:\/\/www.cisa.gov\/known-exploited-vulnerabilities-catalog\" target=\"_blank\">g<\/a><a rel=\"noreferrer noopener\" href=\"https:\/\/www.cisa.gov\/known-exploited-vulnerabilities-catalog\" target=\"_blank\">e<\/a><a rel=\"noreferrer noopener\" href=\"https:\/\/www.cisa.gov\/known-exploited-vulnerabilities-catalog\" target=\"_blank\">n<\/a><a rel=\"noreferrer noopener\" href=\"https:\/\/www.cisa.gov\/known-exploited-vulnerabilities-catalog\" target=\"_blank\">c<\/a><a rel=\"noreferrer noopener\" href=\"https:\/\/www.cisa.gov\/known-exploited-vulnerabilities-catalog\" target=\"_blank\">y<\/a><a rel=\"noreferrer noopener\" href=\"https:\/\/www.cisa.gov\/known-exploited-vulnerabilities-catalog\" target=\"_blank\">&#8216;<\/a><a rel=\"noreferrer noopener\" href=\"https:\/\/www.cisa.gov\/known-exploited-vulnerabilities-catalog\" target=\"_blank\">s<\/a><a rel=\"noreferrer noopener\" href=\"https:\/\/www.cisa.gov\/known-exploited-vulnerabilities-catalog\" target=\"_blank\">Known Exploited Vulnerabilities<\/a> (KEV) catalog are <a rel=\"noreferrer noopener\" href=\"https:\/\/www.scmagazine.com\/analysis\/vulnerability-management\/microsoft-patch-tuesday-fixes-six-zero-day-vulnerabilities\" target=\"_blank\">vulnerabilities<\/a> that would let attackers escalate privileges to the SYSTEM level.<\/p>\n<p>The two CVEs that could let attackers reach the SYSTEM level are <a href=\"https:\/\/msrc.microsoft.com\/update-guide\/en-US\/vulnerability\/CVE-2023-23376\">CVE-2023-23376<\/a> and <a href=\"https:\/\/msrc.microsoft.com\/update-guide\/vulnerability\/CVE-2023-21823\">CVE-2023-21823<\/a>. The former was an elevation of privilege vulnerability in the Windows Common Log File System Driver, and the latter was a <a href=\"https:\/\/www.scmagazine.com\/brief\/application-security\/microsoft-vulnerabilities-most-exploited-in-us-financial-sector\">vulnerability<\/a> in the Windows Graphics Component. The other Microsoft CVE that made the KEV catalog was a security feature bypass in Microsoft Publisher <a href=\"https:\/\/msrc.microsoft.com\/update-guide\/vulnerability\/CVE-2023-21715\">CVE-2023-21715<\/a><\/p>\n<p>Ryan Cribelar, a vulnerability research engineer at Nucleus Security, explained that by gaining SYSTEM access, an attacker can pair the vulnerability with a code execution and move laterally throughout a network.<\/p>\n<p>\u201cSo in Phase 1 they would take over the machine and in Phase 2 they could move laterally,\u201d Cribelar said. \u201cIf a ransomware campaign actor were to put together this exploit with another bug that allows them to move across the machine, that\u2019s where a ransomware campaign could succeed at its highest level.\u201d<\/p>\n<p>Casey Ellis, founder and CTO at Bugcrowd, added that CVE-2023-23376 certainly looks like the worst vulnerability of the lot given the ubiquity of the vulnerable components, its low complexity to exploit, and the fact that it\u2019s likely to lead to SYSTEM-level privilege, the highest available on a Windows machine.<\/p>\n<p>\u201cThe vulnerability is a local privilege escalation bug, which means it requires an attacker to have some form of existing access to the system they are wanting to attack,\u201d Ellis said. \u201cHowever, there are a very wide variety of far more common exploits and methods available to achieve&nbsp;this.\u201d<\/p>\n<p>Chris Goettl, vice president of product management at Ivanti, added that CVE-2023-21823 was rated as &#8220;Important&#8221; and affects Windows 10 and Server 2008 and later Windows editions. It also affects Microsoft Office for iOS, Android and Universal. \u201cWindows customers are urged to update to the latest OS version,\u201d said Goettl. \u201cFor the app updates Microsoft included additional notes regarding how to update through the Microsoft Store or Play Store.\u201d<\/p>\n<p>Goettl also pointed out that security pros should focus on the four CVEs (none of which were exploited in the wild) that affect <a href=\"https:\/\/techcommunity.microsoft.com\/t5\/exchange-team-blog\/released-february-2023-exchange-server-security-updates\/ba-p\/3741058\">Microsoft Exchange<\/a>, pointing out that there have been <a href=\"https:\/\/www.scmagazine.com\/news\/remote-access\/new-microsoft-exchange-zero-day-actively-exploited-security-firm-says\">two significant attacks <\/a>on Exchange in the past two years and he anticipated another such attack in the first six months of 2023.<\/p>\n<p>READ MORE <a href=\"https:\/\/packetstormsecurity.com\/news\/view\/34332\/Two-Zero-Days-Fixed-In-Patch-Tuesday-Can-Escalate-Privileges-To-SYSTEM.html\">HERE<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>READ MORE HERE&#8230;<\/p>\n","protected":false},"author":2,"featured_media":50635,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"colormag_page_layout":"default_layout","footnotes":""},"categories":[60],"tags":[5623],"class_list":["post-50634","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-packet-storm","tag-headlinemicrosoftflawpatchzero-day"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Two Zero-Days Fixed In Patch Tuesday Can Escalate Privileges To SYSTEM 2026 | ThreatsHub Cybersecurity News<\/title>\n<meta name=\"description\" content=\"ThreatsHub Cybersecurity News | ThreatsHub.org | 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