Azure Logic Apps Erhöhung von Privilegien Schwachstelle

The path traversal vulnerability in Azure Logic Apps allows an attacker to bypass intended access restrictions and interact with files and directories outside of the intended scope. By crafting malicious input that includes directory traversal sequences (e.g., '..'), an attacker can potentially read, write, or execute arbitrary files on the system. This could lead to the compromise of sensitive data, the execution of malicious code, and ultimately, complete control over the affected Logic App instance and potentially connected resources. The blast radius extends to any services or data accessed by the Logic App, making it a significant security risk.

Organizations heavily reliant on Azure Logic Apps for automation and integration workflows are at risk. Specifically, environments with complex Logic App configurations or those that handle sensitive data are particularly vulnerable. Shared hosting environments utilizing Azure Logic Apps should also be carefully reviewed.

• azure: Monitor Azure Activity Logs for suspicious API calls related to file operations within Logic Apps. Look for unusual patterns of file access or modification.

Get-AzActivityLog -ResourceGroupName "YourResourceGroup" -Search "LogicApp" -Status Succeeded -TimeGenerated @{StartTime = (Get-Date).AddDays(-7);EndTime = Get-Date} | Where-Object {$_.OperationName -like "*Write*"} | Select-Object OperationName, TimeGenerated, Caller

• azure: Utilize Azure Security Center/Defender for Cloud to detect and alert on potential path traversal attempts. Configure custom rules to identify suspicious file access patterns. • generic web: Review Azure Logic Apps logs for attempts to access files outside of the intended directory. Look for unusual file paths or characters in the request URLs. • generic web: Implement web application firewall (WAF) rules to block requests containing suspicious characters or patterns that could indicate a path traversal attack.

1. 2026-01-22Disclosure

   disclosure

1. Reserviert2025-12-11
2. Veröffentlicht2026-01-22
3. Geändert2026-04-01
4. EPSS aktualisiert2026-03-23

The primary mitigation for CVE-2026-21227 is to upgrade to a patched version of Azure Logic Apps once Microsoft releases a fix. Until the patch is available, implement strict input validation and access controls to limit the attacker's ability to manipulate file paths. This includes validating all user-supplied input, sanitizing file names, and restricting access to sensitive directories. Consider implementing a Web Application Firewall (WAF) with rules to block requests containing directory traversal sequences. Regularly review and audit Logic App configurations to identify and address potential vulnerabilities.