CVE-2015-3932 in Mokka
Summary
by MITRE
Netlock Mokka before 2.7.8.1204 allows remote attackers to perform XML signature wrapping attacks via an e-akta signed document with a ds:Object node with a crafted payload prepended to a valid ds:Object.
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Analysis
by VulDB Data Team • 12/13/2022
The vulnerability identified as CVE-2015-3932 affects Netlock Mokka versions prior to 2.7.8.1204, representing a critical security flaw in XML signature processing mechanisms. This vulnerability enables remote attackers to execute XML signature wrapping attacks through the manipulation of e-akta signed documents, specifically targeting the ds:Object node within XML signatures. The flaw exploits the insufficient validation of XML signature structures, allowing malicious actors to prepend crafted payloads to legitimate ds:Object elements without detection.
The technical implementation of this vulnerability stems from inadequate XML signature validation procedures within the Netlock Mokka software. When processing signed documents, the system fails to properly validate the integrity of the ds:Object node structure, permitting attackers to insert malicious content that appears to be part of a legitimate signature. This weakness creates a path for attackers to bypass digital signature verification mechanisms, potentially leading to unauthorized document modifications or fraudulent signature validation. The vulnerability specifically targets the XML Signature Syntax and Processing standards implementation, where the ds:Object element serves as a container for additional data within XML signatures.
The operational impact of this vulnerability extends beyond simple document integrity concerns, potentially enabling sophisticated attack scenarios that could compromise the entire digital signature ecosystem. Remote attackers can exploit this flaw to manipulate signed documents without detection, undermining the trust model that digital signatures are designed to establish. The vulnerability allows for the execution of malicious payloads through crafted XML structures, potentially leading to privilege escalation, data manipulation, or unauthorized access to systems that rely on these signatures for authentication and authorization. This weakness directly affects the security posture of organizations that depend on Netlock Mokka for document signing and verification processes, particularly in regulated environments where document integrity is paramount.
Mitigation strategies for CVE-2015-3932 should prioritize immediate software updates to version 2.7.8.1204 or later, which contain the necessary patches to address the XML signature validation weaknesses. Organizations should implement comprehensive XML security controls including strict validation of ds:Object node structures, enforcement of XML signature canonicalization rules, and implementation of signature wrapping detection mechanisms. Security teams should conduct thorough vulnerability assessments of all systems utilizing Netlock Mokka, particularly focusing on document processing workflows and digital signature validation procedures. Additionally, implementing network monitoring solutions to detect anomalous XML signature patterns and establishing incident response protocols for signature-related security events will help mitigate potential exploitation. The vulnerability aligns with CWE-347, which addresses improper certificate validation, and may map to ATT&CK techniques involving signature spoofing and code injection through XML manipulation, emphasizing the need for comprehensive security controls across both application and network layers.