{"id":12071,"date":"2025-07-22T13:01:17","date_gmt":"2025-07-22T20:01:17","guid":{"rendered":"https:\/\/blog.resilio.com\/blog\/?p=12071"},"modified":"2025-08-14T14:00:04","modified_gmt":"2025-08-14T21:00:04","slug":"sharepoint-zero-day","status":"publish","type":"post","link":"https:\/\/blog.resilio.com\/blog\/sharepoint-zero-day","title":{"rendered":"Beyond the Patch: Rethinking Resilience After the SharePoint Zero-Day"},"content":{"rendered":"\n<p>On July 20, Microsoft and CISA disclosed a critical zero-day vulnerability (CVE-2025-53770) actively exploited in the wild. This SharePoint vulnerability impacts SharePoint Server 2016, 2019, and Subscription Edition, putting thousands of organizations at risk.<\/p>\n\n\n\n<p>Dubbed \u201cToolShell,\u201d the cybersecurity exploit allows remote code execution without authentication. More troubling, attackers aren\u2019t just gaining access; they\u2019re achieving persistence even after servers are patched by extracting encryption keys and planting web shells.<\/p>\n\n\n\n<p>It\u2019s a sobering reminder that <strong>patching alone doesn\u2019t guarantee safety,<\/strong> especially for organizations relying on centralized, on-prem collaboration systems.<\/p>\n\n\n\n<p><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>What Happened?<\/strong><\/h2>\n\n\n\n<p>CVE-2025-53770 is an unauthenticated deserialization vulnerability affecting Microsoft SharePoint Server. These vulnerabilities <strong>bypass July 2025 patches<\/strong> and enable:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Remote code execution without authentication<\/li>\n\n\n\n<li>Theft of ASP.NET machine-keys<\/li>\n\n\n\n<li>Implant webshells that survive remediation<\/li>\n\n\n\n<li>Maintain long-term access, even after patches are applied<\/li>\n<\/ul>\n\n\n\n<p><\/p>\n\n\n\n<p>The vulnerability <strong>does not affect SharePoint Online<\/strong>, but many enterprises still run hybrid or fully on-prem environments due to compliance, performance, or cost considerations.<\/p>\n\n\n\n<p>Microsoft has released patches for SharePoint 2019 and Subscription Edition. A fix for SharePoint 2016 is still pending. <a href=\"https:\/\/www.cisa.gov\/news-events\/alerts\/2025\/07\/20\/microsoft-releases-guidance-exploitation-sharepoint-vulnerability-cve-2025-53770\" target=\"_blank\" rel=\"noreferrer noopener\">Read the CISA alert<\/a>.<\/p>\n\n\n\n<p><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>The Bigger Problem: Centralization Creates Risk<\/strong><\/h2>\n\n\n\n<p>Even with patches deployed, the nature of this attack highlights a deeper challenge: centralized collaboration infrastructure is inherently vulnerable.<\/p>\n\n\n\n<p>If your SharePoint server is compromised:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Sensitive files can be exfiltrated<\/li>\n\n\n\n<li>Malware or implants can propagate across connections<\/li>\n\n\n\n<li>Backups on the same system may be compromised<\/li>\n\n\n\n<li>Recovery is often slow, costly, and incomplete<\/li>\n<\/ul>\n\n\n\n<p><br>The takeaway? Collaboration resilience is more than keeping SharePoint online. It&#8217;s about maintaining trusted, uncompromised access to your data, no matter what happens to your servers.<\/p>\n\n\n\n<p><\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-style-default\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"427\" src=\"https:\/\/blog.resilio.com\/wp-content\/uploads\/2025\/07\/iStock-2156387160-1024x427.jpg\" alt=\"\" class=\"wp-image-12084\" srcset=\"https:\/\/getsynccom.wpenginepowered.com\/wp-content\/uploads\/2025\/07\/iStock-2156387160-1024x427.jpg 1024w, https:\/\/getsynccom.wpenginepowered.com\/wp-content\/uploads\/2025\/07\/iStock-2156387160-300x125.jpg 300w, https:\/\/getsynccom.wpenginepowered.com\/wp-content\/uploads\/2025\/07\/iStock-2156387160-768x320.jpg 768w, https:\/\/getsynccom.wpenginepowered.com\/wp-content\/uploads\/2025\/07\/iStock-2156387160-1536x640.jpg 1536w, https:\/\/getsynccom.wpenginepowered.com\/wp-content\/uploads\/2025\/07\/iStock-2156387160-2048x853.jpg 2048w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>What To Do Now<\/strong><\/h2>\n\n\n\n<p>Patching is critical, but true resilience means preparing for what happens when patches come too late.<\/p>\n\n\n\n<p><strong>Next steps to protect your environment:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Patch SharePoint servers immediately<\/li>\n\n\n\n<li>Rotate your ASP.NET machine keys to fully eliminate attacker access<\/li>\n\n\n\n<li>Audit your exposure and identify gaps in server-level trust<\/li>\n\n\n\n<li>Monitor file integrity and versioning to support fast rollback<\/li>\n\n\n\n<li>Separate data replication from your collaboration platform<\/li>\n\n\n\n<li>Deploy enterprise-ready peer-to-peer file synchronization with Resilio Active Everywhere<\/li>\n<\/ul>\n\n\n\n<p><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>How Resilio Active Everywhere Helps You Recover Faster and Smarter<\/strong><\/h2>\n\n\n\n<p>Our software platform offers a fundamentally different approach to file access, replication, and protection. Instead of relying on a single server or cloud, <a href=\"https:\/\/www.resilio.com\/active-everywhere-platform\/\">Resilio Active Everywhere<\/a> provides data movement with a modern&nbsp;peer-to-peer architecture, directly between endpoints \u2014 whether they\u2019re in the cloud, in remote offices, or on-premises.<\/p>\n\n\n\n<p>Here&#8217;s how that changes your risk profile in a zero-day scenario:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Decentralized by Design<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Files are replicated between devices without needing to pass through a central SharePoint server<\/li>\n\n\n\n<li>If a server is breached, endpoints retain clean, usable copies<\/li>\n\n\n\n<li>No single point of failure<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Trusted Encryption and Key Control<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>AES-256 encryption protects files in transit<\/li>\n\n\n\n<li>Encryption keys are never stored in a single compromised location and rotated automatically<\/li>\n\n\n\n<li>Optional per-node access policies let you isolate or revoke at a moment\u2019s notice<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>File Integrity &amp; Version Control<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Restore earlier versions from synced endpoints or air-gapped storage<\/li>\n\n\n\n<li>Propagate only the changed portions of files, saving valuable recovery time<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Rapid Isolation &amp; Sync to Clean Hosts<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Redirect sync jobs away from compromised infrastructure<\/li>\n\n\n\n<li>Instantly sync to replacement servers or cloud VMs<\/li>\n\n\n\n<li>Resume work with minimal disruption, even during incident response<\/li>\n<\/ul>\n\n\n\n<p><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Real-World Scenario<\/strong><\/h2>\n\n\n\n<p>Imagine your SharePoint 2019 server is exploited on a Friday afternoon. You patch it Sunday, but the attacker has already installed a hidden webshell. The attacker gains long-term access before anyone notices. You applied Microsoft\u2019s patch over the weekend, but questions remain: What was touched? Can you trust the server? How fast can you get your teams back to work?<\/p>\n\n\n\n<p><strong>With Resilio Active Everywhere in place:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Your SharePoint content has already been continuously synced to other trusted endpoints: user workstations, branch offices, or secure cloud infrastructure<\/li>\n\n\n\n<li>You spin up a clean environment (on-premises or in the cloud) and use Resilio to pull the latest known-good versions of files from those distributed endpoints<\/li>\n\n\n\n<li>You resume operations quickly without relying on the potentially compromised SharePoint server as a single point of truth<\/li>\n\n\n\n<li>You avoid the bottlenecks of traditional restore processes and reduce the risk of propagating tampered files<\/li>\n<\/ul>\n\n\n\n<p><\/p>\n\n\n\n<p>Want help planning your response? <a href=\"https:\/\/www.resilio.com\/schedule-demo\/\">Talk to our data movement experts.<\/a><br><\/p>\n\n\n\n<p><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Final Thought<\/strong><\/h2>\n\n\n\n<p>Every zero-day is a reminder: your data is more than what lives on your server. Make sure it survives the next breach, ransomware event, or patch delay with a file infrastructure that\u2019s as resilient as you are.<\/p>\n\n\n\n<p><strong><br><\/strong><a href=\"https:\/\/www.resilio.com\/schedule-demo\/\">Request a demo: See Resilio in action<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>A critical SharePoint zero-day exposes the limits of patching and centralized systems and underscores the need for resilient, decentralized infrastructure.<\/p>\n","protected":false},"author":56,"featured_media":12087,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[289],"tags":[142,295],"class_list":["post-12071","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-resilio-platform","tag-featured-secondary","tag-post-with-sidebar-new-hero-section"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.9 - 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