CVE-2024-51454: IBM Engineering Workflow Management HTTP Header Injection Vulnerability

Technical summary

CVE-2024-51454 is an HTTP header injection vulnerability (CWE-644) stemming from insufficient input validation of HOST headers in IBM Engineering Workflow Management. The flaw allows an unauthenticated remote attacker to inject arbitrary content into HTTP response headers. Depending on application logic and downstream proxy/cache configurations, this can facilitate cross-site scripting (XSS), HTTP response splitting, cache poisoning, or session fixation attacks. The CVSS 3.1 score of 6.5 (MEDIUM) reflects network accessibility with low attack complexity, partial impact to confidentiality and integrity, but no availability impact.

Business impact

Exploitation could compromise user sessions and enable credential theft from Engineering Workflow Management users. Cache poisoning attacks might serve malicious content to multiple users through shared infrastructure. XSS via header injection could be leveraged to steal sensitive project data, modify workflow configurations, or distribute malware to engineering teams. Organizations relying on Workflow Management for critical product development or supply-chain workflows face operational disruption and data breach risk.

Affected systems

IBM Engineering Workflow Management is affected across three major version lines: 7.0.2 through interim fix 035, 7.0.3 through interim fix 017, and 7.1 through interim fix 004. Organizations should identify deployed instances within these ranges and prioritize patching. Verify your specific interim fix level via the product's version information interface.

Exploitability

This vulnerability is remotely exploitable without authentication, making it accessible to any network-connected attacker. No special user interaction is required. However, practical exploitation impact depends on deployment architecture: applications behind reverse proxies or caches may amplify the vulnerability's reach, while isolated or properly-configured WAF deployments may reduce risk. Currently, this vulnerability is not listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, suggesting active exploitation in the wild has not been widely reported as of the publication date.

Remediation

Apply interim fixes or upgrades to bring Workflow Management versions into supported, patched ranges. For version 7.0.2, update to interim fix 036 or later; for 7.0.3, update to interim fix 018 or later; for 7.1, update to interim fix 005 or later. Verify against IBM's official security advisories for exact patch version numbers and deployment procedures. Test patches in non-production environments before production rollout to confirm compatibility with custom integrations and workflows.

Patch guidance

IBM typically delivers patches as interim fixes or cumulative updates. Check the IBM Security Advisories portal for the specific patch bundle for your version. Download and stage patches in a change-controlled manner. Coordinate with application owners to schedule maintenance windows, as Engineering Workflow Management updates may require service restarts. Document baseline configurations before patching to expedite rollback if needed. Validate post-patch functionality with core workflow processes and integrations.

Detection guidance

Monitor HTTP request and response logs for unusual HOST header values, particularly those containing special characters, multiple colons, or URLs. Look for patterns suggesting header injection attempts (e.g., CRLF sequences, newline characters in HOST headers). Web Application Firewalls (WAFs) should be configured to block malformed or suspicious HOST headers. Correlate access logs with any reported XSS events or unexpected cache behavior. Consider implementing strict HOST header validation at the reverse proxy or load balancer level as a defense-in-depth measure.

Why prioritize this

While rated MEDIUM severity, the combination of network accessibility, lack of authentication requirements, and potential for multi-user impact via cache poisoning or XSS warrants prompt attention. Organizations with public-facing or DMZ-deployed Workflow Management instances should prioritize this higher. Those with Workflow Management isolated to internal networks with strong access controls may adopt a standard patching cadence. The absence of known active exploitation (KEV status: false) provides a window to patch proactively rather than reactively.

Risk score, explained

The CVSS 3.1 score of 6.5 reflects: AV:N (network-accessible), AC:L (low complexity attack), PR:N (no privileges needed), UI:N (no user interaction), S:U (scope unchanged), C:L (partial confidentiality impact via XSS or session theft), I:L (partial integrity impact via cache poisoning or response manipulation), A:N (no availability impact). The score does not assume widespread active exploitation or pre-existing infrastructure vulnerabilities, so real-world risk may be higher or lower depending on your deployment posture.

Frequently asked questions