CVE-2011-1411 in Fusion Middleware
Summary
by MITRE
Shibboleth OpenSAML library 2.4.x before 2.4.3 and 2.5.x before 2.5.1, and IdP before 2.3.2, allows remote attackers to forge messages and bypass authentication via an "XML Signature wrapping attack."
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Analysis
by VulDB Data Team • 01/14/2025
The vulnerability described in CVE-2011-1411 represents a critical security flaw in the Shibboleth OpenSAML library and Identity Provider implementations that enables remote attackers to perform XML signature wrapping attacks. This vulnerability specifically affects versions 2.4.x before 2.4.3 and 2.5.x before 2.5.1 of the OpenSAML library, as well as versions prior to 2.3.2 of the Shibboleth Identity Provider. The flaw resides in the library's insufficient validation of XML signatures, creating a pathway for malicious actors to manipulate authentication messages and bypass the intended security controls.
The technical implementation of this vulnerability stems from improper XML signature validation mechanisms within the OpenSAML library. Attackers can exploit this weakness by crafting specially formatted XML documents that contain multiple signatures, where one signature wraps another in a manner that circumvents the library's validation logic. This type of attack specifically targets the XML signature processing routines that are responsible for verifying the authenticity and integrity of SAML assertions used in federated identity systems. The vulnerability allows attackers to create forged authentication messages that appear legitimate to the relying party, effectively bypassing the authentication mechanisms that should protect the system.
The operational impact of this vulnerability is severe and far-reaching within federated identity environments that rely on Shibboleth for authentication services. Organizations using affected versions of the library face the risk of unauthorized access to protected resources, as attackers can forge valid authentication tokens and impersonate legitimate users. This compromise undermines the fundamental security assumptions of the SAML-based authentication system, potentially leading to data breaches, privilege escalation, and unauthorized system access. The vulnerability is particularly dangerous in environments where Shibboleth serves as a critical authentication component for enterprise applications, cloud services, and government identity federation systems.
The attack vector for this vulnerability follows the patterns defined by the attack technique known as XML Signature Wrapping, which is categorized under the MITRE ATT&CK framework as part of the Credential Access and Defense Evasion tactics. This attack technique specifically targets the validation of digital signatures in XML documents, exploiting weaknesses in signature processing logic. The vulnerability aligns with CWE-347, which describes "Improper Verification of Cryptographic Signature," and represents a failure in proper cryptographic validation that allows attackers to bypass security controls through manipulation of signature structures.
Mitigation strategies for this vulnerability require immediate patching of all affected systems to the patched versions of the OpenSAML library and Shibboleth Identity Provider. Organizations must conduct comprehensive inventory assessments to identify all systems utilizing vulnerable versions and implement remediation procedures across their infrastructure. Additionally, security teams should review and strengthen their XML signature validation processes, implement proper signature verification mechanisms, and consider additional authentication layers as defense-in-depth measures. Network monitoring should be enhanced to detect anomalous authentication patterns that might indicate exploitation attempts, while access controls should be reviewed and strengthened to minimize potential impact from successful attacks. Regular security assessments and vulnerability management processes should be implemented to prevent similar issues from arising in the future, with particular attention to cryptographic validation routines and XML processing security controls.