CVE-2023-47152: IBM Db2 Information Disclosure Vulnerability

CVE-2023-47152 Overview

IBM Db2 for Linux, UNIX and Windows (includes Db2 Connect Server) version 11.5 contains a critical security vulnerability involving the use of an insecure cryptographic algorithm combined with information disclosure through stack trace exposure under exceptional conditions. This weakness (CWE-209: Generation of Error Message Containing Sensitive Information) allows remote attackers to potentially obtain sensitive information without requiring authentication or user interaction.

The vulnerability stems from improper handling of error conditions that can expose internal stack trace information, combined with the use of cryptographic algorithms that do not meet current security standards. This combination creates a significant attack surface for adversaries seeking to gather reconnaissance data about the database environment.

Critical Impact

Remote unauthenticated attackers can exploit this vulnerability to access sensitive configuration and internal system information through exposed stack traces, potentially aiding in further attacks against IBM Db2 deployments.

Affected Products

• IBM Db2 for Linux, UNIX and Windows 11.5
• IBM Db2 Connect Server 11.5
• Deployments on IBM AIX, Linux on IBM Z, Linux Kernel, and Microsoft Windows platforms

Discovery Timeline

• 2024-01-22 - CVE-2023-47152 published to NVD
• 2024-11-21 - Last updated in NVD database

Technical Details for CVE-2023-47152

Vulnerability Analysis

This vulnerability represents a compound security issue affecting IBM Db2's error handling and cryptographic implementation. When exceptional conditions occur during database operations, the system generates verbose error messages containing stack trace information that should remain internal to the application. This information disclosure weakness (CWE-209) can reveal sensitive details about the internal workings of the database system, including function names, memory addresses, and potentially sensitive configuration parameters.

The secondary concern involves the use of insecure cryptographic algorithms within the affected Db2 versions. While specific algorithmic weaknesses are not detailed in the advisory, the use of deprecated or weak cryptographic primitives can compromise the confidentiality of data in transit or at rest.

The network-accessible nature of this vulnerability, combined with the lack of required privileges or user interaction, makes it particularly concerning for internet-facing or internal network-exposed Db2 deployments.

Root Cause

The root cause involves two distinct issues: improper error handling that fails to sanitize exception output before displaying to users or logging, and the continued use of cryptographic algorithms that no longer meet modern security standards. The information disclosure occurs when Db2 encounters exceptional conditions and generates detailed stack traces that are inadvertently exposed to unauthorized parties rather than being properly logged internally or sanitized.

Attack Vector

An attacker can exploit this vulnerability remotely over the network without requiring authentication or user interaction. The attack involves triggering exceptional conditions in the Db2 server through specially crafted requests or inputs designed to cause error states. When these conditions occur, the exposed stack trace information provides valuable reconnaissance data including:

• Internal function names and execution flow
• Memory layout information
• Configuration details
• Potentially sensitive file paths and system information

This information can be leveraged to identify additional vulnerabilities, understand the deployment architecture, or craft more targeted follow-up attacks against the database infrastructure.

Detection Methods for CVE-2023-47152

Indicators of Compromise

• Unusual patterns of failed database connection attempts or malformed queries designed to trigger exceptions
• Log entries showing detailed stack traces being returned to client connections
• Network traffic analysis revealing verbose error responses containing internal system information
• Anomalous probe-like requests targeting known exception-triggering conditions

Detection Strategies

• Monitor Db2 server logs for patterns of repeated exception conditions or error states
• Implement network traffic inspection to detect stack trace information in outbound responses
• Deploy database activity monitoring (DAM) solutions to identify suspicious query patterns
• Review authentication logs for failed or anomalous connection attempts preceding error conditions

Monitoring Recommendations

• Enable detailed logging of all database exceptions and error conditions
• Configure alerting for unusual volumes of error responses to external connections
• Implement network-based intrusion detection signatures for Db2-specific exploitation patterns
• Regularly audit error handling configurations to ensure stack traces are not exposed externally

How to Mitigate CVE-2023-47152

Immediate Actions Required

• Review and apply the security updates from IBM for Db2 version 11.5
• Audit current error handling configurations to ensure stack traces are not exposed to clients
• Implement network segmentation to limit exposure of Db2 instances
• Enable enhanced logging to detect potential exploitation attempts

Patch Information

IBM has released a security update addressing this vulnerability. Administrators should consult the IBM Support Document for detailed patch information and download links. NetApp has also released a related advisory available at the NetApp Security Advisory for affected products. Additional technical details are available through the IBM X-Force Vulnerability Report.

Workarounds

• Configure Db2 to suppress detailed error messages and stack traces in client-facing responses
• Implement a web application firewall (WAF) or database firewall to filter sensitive information from error responses
• Restrict network access to Db2 instances using firewall rules and access control lists
• Enable TLS/SSL for all database connections to protect against interception of any leaked information
• Review and harden cryptographic configurations using IBM's security hardening guides

# Example: Verify Db2 version and check for security patches
db2level

# Review current diagnostic settings
db2 get dbm cfg | grep DIAG

# Ensure diaglevel is set appropriately to limit verbose output
db2 update dbm cfg using DIAGLEVEL 2