{"id":46430,"date":"2022-04-28T15:14:14","date_gmt":"2022-04-28T15:14:14","guid":{"rendered":"https:\/\/packetstormsecurity.com\/news\/view\/33383\/Microsoft-Patches-Cross-Tenant-Bug-In-Azure-PostgreSQL.html"},"modified":"2022-04-28T15:14:14","modified_gmt":"2022-04-28T15:14:14","slug":"microsoft-patches-cross-tenant-bug-in-azure-postgresql","status":"publish","type":"post","link":"https:\/\/www.threatshub.org\/blog\/microsoft-patches-cross-tenant-bug-in-azure-postgresql\/","title":{"rendered":"Microsoft Patches Cross Tenant Bug In Azure PostgreSQL"},"content":{"rendered":"<div class=\"share-bar-wrapper\">\n<div class=\"full-byline\">\n<div class=\"author-avatars\"> <a rel=\"author\" class=\"thumb author-modal-open\" data-component=\"authorModal\" data-author-modal-options=\"{&quot;selector&quot;:&quot;charlie-osborne-modal&quot;,&quot;hoverSelector&quot;:&quot;.full-byline&quot;}\" href=\"https:\/\/www.zdnet.com\/meet-the-team\/us\/charlie-osborne\/\" data-vanity-rewritten=\"true\"> <span class=\"img \"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.zdnet.com\/a\/img\/resize\/c8ef739a72ea5f7507a32fca52940befe437ac45\/2014\/07\/22\/36b8334d-1175-11e4-9732-00505685119a\/charlie-osborne.jpg?width=50&amp;height=50&amp;fit=crop&amp;auto=webp\" class alt=\"Charlie Osborne\" height=\"50\" width=\"50\"><\/span> <\/a> <\/div>\n<\/p><\/div>\n<\/p><\/div>\n<p><a href=\"https:\/\/www.zdnet.com\/blog\/microsoft\/\" target=\"_blank\" rel=\"noopener\">Microsoft<\/a> has patched a security weakness in Azure PostgreSQL which could have been exploited to execute malicious code. <\/p>\n<p>On Thursday, researchers from Wiz Research published an advisory on &#8220;ExtraReplica,&#8221; described as a &#8220;cross-account database vulnerability&#8221; in Azure&#8217;s infrastructure.<\/p>\n<p>Microsoft Azure is a hybrid cloud service and accounts for hundreds of thousands of enterprise customers. <\/p>\n<p>According <a href=\"https:\/\/www.wiz.io\/blog\/tag\/research\/\" target=\"_blank\" rel=\"noopener noreferrer nofollow\" data-component=\"externalLink\">to Wiz<\/a>, a &#8220;chain&#8221; of vulnerabilities could be used to bypass Azure&#8217;s tenant isolation, which prevents software-as-a-service (SaaS) systems customers from accessing resources belonging to other tenants. <\/p>\n<p>ExtraReplica&#8217;s core attack vector is based on a flaw that allowed attackers read access to PostgreSQL databases without authorization. <\/p>\n<p>Once a target, public PostgreSQL Flexible Server has been selected, an attacker has to find the target&#8217;s Azure region &#8220;by resolving the database domain name and matching it to one of Azure&#8217;s public IP ranges,&#8221; according to Wiz. <\/p>\n<p>An attacker-controlled database then has to be created in the same region. The first vulnerability, found in Azure&#8217;s PostgreSQL engine modifications, would be exploited on the attacker-controlled instance, leading to escalated &#8216;superuser&#8217; privileges and the ability to execute code. <\/p>\n<p>The second bug in the chain, buried in the certificate authentication process, would then be triggered on the target instance via replication to gain read access. <\/p>\n<p>While this attack could be used on a subnet, the Certificate Transparency feed could also be abused to retrieve domain SSL certificates and extract a database&#8217;s unique identifier, thereby expanding the potential attack surface beyond a subnet. <\/p>\n<p>An attacker would need to retrieve target information from the <a href=\"https:\/\/techcommunity.microsoft.com\/t5\/core-infrastructure-and-security\/how-will-certificate-transparency-affect-existing-active\/ba-p\/1129077\" target=\"_blank\" rel=\"noopener noreferrer\" data-component=\"externalLink\">Certificate Transparency<\/a> feed and purchase a &#8220;specifically crafted certificate&#8221; from a CA to perform such an exploit. <\/p>\n<p>The vulnerability doesn&#8217;t, however, impact Single Server instances or Flexible servers with &#8220;VNet network configuration (Private access)&#8221; enabled, according to the researchers. <\/p>\n<p>The vulnerability was disclosed to Microsoft in January. Microsoft&#8217;s security team triaged the vulnerability and was able to replicate the flaw. <\/p>\n<p>Wiz was awarded a bug bounty of $40,000 for its report and a fix was rolled out by February 25 by the Redmond giant. Now fully mitigated, Azure customers do not need to take any action. <\/p>\n<p>Microsoft <a href=\"https:\/\/msrc-blog.microsoft.com\/2022\/04\/28\/azure-database-for-postgresql-flexible-server-privilege-escalation-and-remote-code-execution\" target=\"_blank\" rel=\"noopener noreferrer\" data-component=\"externalLink\">is not aware of<\/a> any exploitation in the wild. <\/p>\n<p>&#8220;We appreciate MSRC&#8217;s cooperation and their attentiveness to our report,&#8221; the researchers commented. &#8220;Their professional approach and close communication throughout the disclosure process is a model for all vendors.&#8221; <\/p>\n<h3> Previous and related coverage <\/h3>\n<hr>\n<p><strong>Have a tip?<\/strong> Get in touch securely via WhatsApp | Signal at +447713 025 499, or over at Keybase: charlie0<\/p>\n<hr>\n<p> READ MORE <a href=\"https:\/\/packetstormsecurity.com\/news\/view\/33383\/Microsoft-Patches-Cross-Tenant-Bug-In-Azure-PostgreSQL.html\">HERE<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>READ MORE HERE&#8230;<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"colormag_page_layout":"default_layout","footnotes":""},"categories":[60],"tags":[9982],"class_list":["post-46430","post","type-post","status-publish","format-standard","hentry","category-packet-storm","tag-headlinemicrosoftdatabaseflawpatch"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Microsoft Patches Cross Tenant Bug In Azure PostgreSQL 2026 | ThreatsHub Cybersecurity News<\/title>\n<meta name=\"description\" content=\"ThreatsHub Cybersecurity News | ThreatsHub.org | Cloud Security &amp; Cyber Threats Analysis Hub. 100% Free 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