CVE-2025-27900: IBM DB2 Recovery Expert Open Redirect

CVE-2025-27900 Overview

IBM DB2 Recovery Expert for LUW 5.5 Interim Fix 002 contains an open redirect vulnerability that could allow a remote attacker to conduct phishing attacks. By persuading a victim to visit a specially crafted web site, a remote attacker could exploit this vulnerability to spoof the URL displayed to redirect a user to a malicious web site that would appear to be trusted. This could allow the attacker to obtain highly sensitive information or conduct further attacks against the victim.

Critical Impact

Attackers can leverage this open redirect vulnerability to conduct sophisticated phishing campaigns against IBM DB2 Recovery Expert users, potentially leading to credential theft and further compromise of enterprise database infrastructure.

Affected Products

• IBM DB2 Recovery Expert for LUW 5.5 Interim Fix 002

Discovery Timeline

• 2026-02-17 - CVE CVE-2025-27900 published to NVD
• 2026-02-18 - Last updated in NVD database

Technical Details for CVE-2025-27900

Vulnerability Analysis

This vulnerability is classified as CWE-601 (URL Redirection to Untrusted Site, commonly known as Open Redirect). The flaw exists within the web interface of IBM DB2 Recovery Expert for LUW, where insufficient validation of user-supplied URL parameters allows attackers to craft malicious links that appear to originate from a legitimate IBM domain.

When a user clicks on a specially crafted URL, the application redirects them to an attacker-controlled external site without proper validation. Since the initial URL appears to come from a trusted IBM domain, victims are more likely to trust the destination, making this an effective vector for phishing attacks targeting database administrators and enterprise users.

Root Cause

The vulnerability stems from improper input validation in the URL redirection functionality of the IBM DB2 Recovery Expert web interface. The application fails to adequately verify that redirect URLs point to trusted destinations before processing the redirect, allowing attackers to inject arbitrary external URLs as redirect targets.

Attack Vector

The attack vector is network-based, requiring user interaction. An attacker would craft a malicious URL containing the vulnerable IBM DB2 Recovery Expert endpoint with an attacker-controlled redirect destination as a parameter. The attacker then distributes this link through phishing emails, social engineering, or other means. When the victim clicks the link, they are initially directed to the legitimate IBM server, which then redirects them to the malicious site.

This technique is particularly effective because:

• The initial URL appears to be a legitimate IBM domain
• Security-conscious users checking the URL see a trusted domain
• Email security filters may allow the URL through as it points to a known enterprise vendor
• The redirect happens seamlessly, leaving victims unaware they've been redirected

Detection Methods for CVE-2025-27900

Indicators of Compromise

• Unusual outbound redirects from IBM DB2 Recovery Expert web interface to external domains
• Web server logs showing requests with suspicious URL parameters containing external domain references
• User reports of unexpected redirects when accessing IBM DB2 Recovery Expert links
• Phishing emails containing links to your IBM DB2 Recovery Expert installation with appended redirect parameters

Detection Strategies

• Monitor web application logs for requests to IBM DB2 Recovery Expert endpoints containing redirect parameters with external URLs
• Implement URL pattern analysis to detect crafted links containing the vulnerable redirect functionality
• Deploy web application firewall (WAF) rules to detect and block open redirect patterns targeting the affected application
• Review email gateway logs for phishing attempts containing links to your IBM DB2 Recovery Expert installation

Monitoring Recommendations

• Enable detailed logging on IBM DB2 Recovery Expert web interface to capture all URL parameters
• Configure security information and event management (SIEM) rules to alert on redirect patterns to untrusted domains
• Monitor user access patterns to identify unusual redirect behavior from the application
• Implement network traffic analysis to detect redirects from IBM infrastructure to suspicious external destinations

How to Mitigate CVE-2025-27900

Immediate Actions Required

• Review IBM's security bulletin and apply available patches immediately
• Implement URL validation at the web application firewall level to block open redirect attempts
• Educate users about phishing risks and the importance of verifying final destination URLs
• Consider restricting access to the IBM DB2 Recovery Expert web interface to trusted networks only

Patch Information

IBM has released security guidance for this vulnerability. Administrators should consult the IBM Support Page for the latest patch information and apply the recommended security update as soon as possible to address this open redirect vulnerability.

Workarounds

• Configure web application firewall rules to block requests containing redirect parameters with external domains
• Implement allowlist-based URL validation for any redirect functionality if custom modifications are possible
• Restrict network access to IBM DB2 Recovery Expert to internal trusted networks only
• Deploy browser extensions or proxy rules to warn users when redirects to untrusted domains occur

# Example WAF rule to block open redirect attempts (generic pattern)
# Block requests with redirect parameters containing external URLs
# Adjust pattern based on your WAF vendor syntax
SecRule ARGS "@rx https?://(?!yourdomain\.com)" "id:1001,deny,status:403,msg:'Blocked potential open redirect'"