CVE-2018-25272: ELBA5 5.8.0 RCE via Default Database Credentials and xp_cmdshell

CVE-2018-25272: ELBA5 5.8.0 Remote Code Execution via Database Credential Exploitation

A critical remote code execution vulnerability originally discovered in 2018 has been formally assigned as CVE-2018-25272 and published to the NIST NVD with a CVSS score of 9.8 (Critical). The vulnerability affects ELBA5 version 5.8.0, a software product used for banking and financial data processing.

The attack chain is multi-stage: an attacker connects to the application's embedded SQL Server database using default connector credentials, retrieves and decrypts the DBA account password stored within the database, then uses those elevated credentials to enable the xp_cmdshell stored procedure and execute arbitrary operating system commands with SYSTEM-level privileges — the highest privilege level on Windows.

Vulnerability Overview

Technical Details

The vulnerability involves a multi-step exploitation chain against the ELBA5 application database:

Step 1 — Connect with default credentials

ELBA5 5.8.0 ships with a database connector using hardcoded or default credentials. An attacker with network access to the SQL Server port can authenticate using these known credentials:

Server: <target>:1433
User: <default-connector-user>
Pass: <default-connector-password>

Step 2 — Retrieve and decrypt the DBA password

Once connected with the connector account, the attacker can query internal ELBA5 configuration tables that store the DBA account password in a weakly encrypted or encoded format:

SELECT config_value FROM elba_config WHERE config_key = 'dba_password';
-- Decrypt the retrieved value using the known ELBA5 decryption scheme

Step 3 — Enable xp_cmdshell and execute OS commands

With DBA credentials, the attacker enables the xp_cmdshell stored procedure (disabled by default but re-enableable by a DBA) and executes arbitrary OS commands:

EXEC sp_configure 'show advanced options', 1; RECONFIGURE;
EXEC sp_configure 'xp_cmdshell', 1; RECONFIGURE;
EXEC xp_cmdshell 'whoami';
-- Returns: nt authority\system

Impact of successful exploitation:

• Full SYSTEM-level command execution — highest privilege on the Windows host
• Complete host compromise — install malware, create admin accounts, disable security tools
• Data theft — access to all financial records processed by ELBA5
• Lateral movement — SYSTEM privileges allow pivoting to other network resources
• Persistent access — ability to install backdoors or scheduled tasks

Context and Impact

ELBA5 is banking and payment processing software; the data it handles — financial transactions, account records, payment details — makes this a particularly high-impact vulnerability. The multi-step nature of the attack chain does not meaningfully reduce risk because each step is deterministic once the initial default credentials are known.

Who is affected:

• Organizations running ELBA5 version 5.8.0 with the SQL Server database accessible from the network
• Banking institutions, payment processors, or financial services organizations in ELBA5's user base
• Any deployment where the default connector credentials have not been changed or rotated

Broader implications: This vulnerability reflects a well-known class of risk: default credential abuse combined with database command execution. Microsoft SQL Server's xp_cmdshell has been a common escalation path for decades precisely because it bridges database access and OS-level command execution.

Remediation

1. Apply vendor patches — check with ELBA5 vendor for a patched version that removes hardcoded connector credentials and secures DBA password storage
2. Rotate all database credentials immediately — change the connector account password and the DBA account password; do not use default or vendor-supplied values
3. Disable xp_cmdshell — ensure xp_cmdshell is disabled at the SQL Server level and that no application user has the sysadmin role:

   EXEC sp_configure 'xp_cmdshell', 0; RECONFIGURE;

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4. Restrict database network access — firewall the SQL Server port (1433) so it is only accessible from the application server, not from arbitrary network hosts
5. Encrypt stored credentials — ensure any credentials stored in the application database use strong cryptography (bcrypt, Argon2) and not reversible encoding or weak encryption
6. Audit for compromise — if running ELBA5 5.8.0, review SQL Server audit logs for xp_cmdshell usage, unexpected logins, or sp_configure calls

Key Takeaways

1. CVE-2018-25272 is a critical RCE in ELBA5 5.8.0, now formally catalogued in NVD with CVSS 9.8
2. Multi-stage attack chain: default connector creds → DBA password decrypt → xp_cmdshell → SYSTEM RCE
3. SYSTEM-level impact — full host compromise is achievable via the database attack path
4. Default credentials are the root cause — credential rotation and access restriction are the most effective immediate mitigations
5. Financial data at risk — ELBA5's banking context makes this a priority remediation for any affected organization

Sources

• CVE-2018-25272 — NIST NVD