Citrix ShareFile Storage Zones Controller Authentication Bypass and Remote Code Execution (RCE) Vulnerability (CVE-2023-24489) Security Advisory
Executive & SecOps Summary
SECOPS ASSESSMENTCitrix ShareFile Storage Zones Controller versions prior to 5.11.24
Unauthenticated remote attackers can exploit a padding oracle vulnerability to bypass authentication, upload arbitrary files, and execute remote code with SYSTEM privileges
Immediately upgrade customer-managed Storage Zones Controllers to version 5.11.24 or later, and restrict external access
Affected Products & Version Scope
Remediation & Live Workaround Commands
PATCH & WORKAROUND1. Official Patch & Version Upgrade Commands
Apply the official security update immediately by upgrading the Storage Zones Controller to version 5.11.24 or higher. Use the following PowerShell command to verify the currently installed version:
# Check the installed version of ShareFile Storage Zones Controller
Get-ItemProperty HKLM:\Software\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\* | Where-Object { $_.DisplayName -like '*ShareFile*' } | Select-Object DisplayName, DisplayVersion2. Temporary Workaround & Hardening Configuration
If patching cannot be applied immediately, restrict access to the controller at the network level or configure IIS Request Filtering to block suspicious requests to the upload endpoints.
<!-- Example IIS URL Rewrite rule to restrict access to vulnerable endpoints -->
<configuration>
<system.webServer>
<rewrite>
<rules>
<rule name='Restrict_ShareFile_Upload' stopProcessing='true'>
<match url='.*upload\.aspx.*' />
<conditions>
<add input='{REMOTE_ADDR}' pattern='^10\.' negate='true' />
</conditions>
<action type='CustomResponse' statusCode='403' statusReason='Forbidden' />
</rule>
</rules>
</rewrite>
</system.webServer>
</configuration>3. Log Audit & IoC Verification Commands
Scan IIS logs for potential exploitation attempts, specifically looking for anomalous POST requests to the upload endpoints with high frequency or unusual status codes.
# Search IIS logs for suspicious POST requests targeting upload.aspx
Get-ChildItem -Path 'C:\inetpub\logs\LogFiles\' -Recurse -Filter '*.log' |
Select-String -Pattern 'POST /.*upload\.aspx' |
Select-Object -First 50Block Exploits Instantly with Managed Virtual Patching Rules
Can't patch production immediately? Deploy managed WAF rules at the edge to intercept RCE, SQLi, and deserialization payloads before they hit your origin server.
Technical Root Cause & Exploitation Mechanics
1. Vulnerability Overview & Root Cause
This vulnerability (CVE-2023-24489) exists in the customer-managed Citrix ShareFile Storage Zones Controller due to improper cryptographic implementation and broken access control (CWE-284). The root cause lies in a padding oracle vulnerability within the AES-CBC decryption process. By analyzing the differences in error responses during padding validation, an attacker can decrypt or forge valid ciphertext without knowing the secret key.
2. Exploitation Mechanics & Attack Scenario
An unauthenticated attacker sends crafted ciphertext blocks to specific endpoints, such as /documentum/upload.aspx. By leveraging the padding oracle, the attacker generates a valid authenticated session state and bypasses security checks. This allows the attacker to upload malicious ASPX files (Web Shells) to the web root and execute them, achieving arbitrary remote code execution (RCE) under the context of the IIS application pool identity (typically SYSTEM).
3. Infrastructure & Business Impact
With a CVSS score of 9.8 (Critical) and active exploitation confirmed by its inclusion in the CISA KEV catalog, this vulnerability poses an extreme risk. Successful exploitation allows complete compromise of the storage controller, leading to unauthorized access to sensitive corporate data, data exfiltration, and potential lateral movement within the internal network, often serving as an entry point for ransomware campaigns.
Official Vendor Advisories & References
A vulnerability has been discovered in the customer-managed ShareFile storage zones controller which, if exploited, could allow an unauthenticated attacker to remotely compromise the customer-managed ShareFile storage zones controller.
Frequently Asked SecOps Questions (CVE-2023-24489)
FAQQ1. How critical is CVE-2023-24489 and is it actively exploited in the wild?
CVE-2023-24489 is rated CVSS 9.8 (CRITICAL) with a 30-day EPSS exploitation probability of 97.3%. It is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, requiring immediate emergency remediation.
Q2. Which vendors and products are affected by CVE-2023-24489?
Primary impacted vendors include citrix across sharefile storage zones controller. Scope summary: All customer-managed Citrix ShareFile Storage Zones Controller versions prior to 5.11.24
Q3. What temporary mitigations or workarounds exist for CVE-2023-24489 before patching?
[Mitigation] Immediately upgrade customer-managed Storage Zones Controllers to version 5.11.24 or later, and restrict external access Follow the CLI remediation commands and interactive SecOps checklist on this page to restrict exposure prior to your maintenance window.
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