Description

A potential security vulnerability in HPE IceWall products could be exploited to tamper SAML response, allowing an attacker to impersonate another user.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "8.8",
  "pubDate": "2026-09-11T07:16:46.477Z",
  "pubdate": "2026-09-11T07:16:46.477Z",
  "executiveSummary": "A critical security vulnerability has been identified in HPE IceWall products related to the handling and validation of Security Assertion Markup Language (SAML) responses. This flaw enables an unauthenticated or authenticated attacker to perform SAML response tampering, effectively subverting the integrity of the authentication assertion process.\nBy manipulating the SAML assertion data, an attacker can bypass standard authentication mechanisms to impersonate arbitrary users within the environment. This vulnerability poses a severe risk to organizational identity management and access control, as successful exploitation results in unauthorized access to protected resources and sensitive information.\nThe vulnerability resides within the cryptographic validation or parsing logic of the SAML implementation, where insufficient verification of assertion signatures or trust anchors allows for the injection of malicious claims. The impact is significant, potentially granting full access to the target application or system under the identity of a privileged user. No specific authentication is required if the attacker can intercept and modify the assertion in transit, making this a high-risk scenario for environments relying on SAML-based Single Sign-On (SSO) infrastructure.",
  "technicalDetails": "The vulnerability centers on a flaw in the SAML response processing workflow of HPE IceWall. In a standard SAML authentication flow, the Identity Provider (IdP) generates an XML-based assertion that is signed to ensure authenticity and integrity. The Service Provider (SP), in this case, the HPE IceWall component, is responsible for validating this signature against the IdP's public certificate before honoring the claims contained within the assertion.\nThe root cause of this vulnerability is the improper implementation of XML signature verification or deficient XML parsing logic. If the component fails to strictly validate the signature or allows for the manipulation of assertion attributes—such as the NameID or attribute statements—the attacker can craft a malicious SAML response or intercept a legitimate one to perform 'assertion injection'.\nThe exploitation flow generally follows these steps: First, an attacker intercepts a legitimate SAML response during the authentication exchange between the IdP and the SP. Second, the attacker utilizes the flaw in HPE IceWall's processing logic to modify the content of the SAML assertion while either bypassing the signature check—through techniques such as XML Signature Wrapping (XSW) or by exploiting vulnerabilities in the XML parser like XML External Entity (XXE) or insecure canonicalization—or by presenting a forged assertion that the system incorrectly deems trustworthy.\nSpecifically, if the application fails to verify the 'Recipient' field or the 'SubjectConfirmationData' attributes, an attacker can reuse a valid assertion or modify the identity claims within the assertion body to match a target victim. Once the tampered assertion is presented to the SP, the HPE IceWall product erroneously treats the forged request as a successful, authenticated event. This grants the attacker a session associated with the identity they injected into the assertion. The post-exploitation impact allows for total identity impersonation, where the attacker assumes the privileges of the target user, enabling unauthorized access to any system resources mapped to that user's role."
}