IBM CICS TX information disclosure

Vulnerability

IBM CICS TX Advanced 11.1 and IBM CICS TX Standard all versions may leak sensitive information in HTTP response headers [1][2]. The vulnerability exists because the software does not properly sanitize or control the contents of HTTP headers, potentially exposing internal details or credentials to network adversaries.

Exploitation

An attacker with network access to the affected CICS TX system can send HTTP requests and observe the responses. No authentication or user interaction is required; the attack is remote and low-complexity [1][2]. By analyzing the HTTP response headers, the attacker can extract sensitive information.

Impact

Successful exploitation leads to information disclosure, specifically low confidentiality impact as per CVSS [1]. The attacker may obtain sensitive data embedded in HTTP headers, such as session tokens or internal configuration details, which could be used to further compromise the application or network.

Mitigation

IBM has released interim fixes for both IBM CICS TX Advanced 11.1 and IBM CICS TX Standard 11.1 [1][2]. The fix addresses the information disclosure by removing sensitive data from HTTP headers. Customers should apply the appropriate fix from IBM Fix Central and review the security bulletin for instructions. No workarounds are available.