CVE-2015-6747 in Banking
Summary
by MITRE
Basware Banking (Maksuliikenne) 8.90.07.X does not properly prevent access to private keys, which allows remote attackers to spoof communications with banks via unspecified vectors. NOTE: this identifier was SPLIT from CVE-2015-0942 per ADT2 due to different vulnerability types. NOTE: this vulnerability exists because of an incorrect fix for CVE-2015-6746.
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Analysis
by VulDB Data Team • 11/13/2017
The vulnerability described in CVE-2015-6747 represents a critical security flaw in Basware Banking (Maksuliikenne) version 8.90.07.X that fundamentally undermines the integrity of secure communications with financial institutions. This issue specifically targets the improper handling of private key access controls, creating a pathway for remote attackers to compromise the authentication mechanisms used in banking communications. The vulnerability emerged as a result of an inadequate remediation effort for a previous security issue, CVE-2015-6746, where the fix introduced new weaknesses rather than resolving the underlying problem. The flaw allows malicious actors to potentially impersonate legitimate banking systems or users, thereby enabling unauthorized transactions and data interception.
The technical nature of this vulnerability stems from insufficient access controls over cryptographic private keys that are essential for secure communication between financial applications and banking services. When a system fails to properly protect private keys, it creates opportunities for attackers to extract or manipulate these critical cryptographic elements. This weakness enables man-in-the-middle attacks where adversaries can establish fraudulent communication channels that appear legitimate to banking systems. The unspecified vectors mentioned in the description suggest that multiple attack pathways may exist, potentially including network-based exploitation, credential theft, or session hijacking techniques that leverage the compromised key access controls.
From an operational perspective, this vulnerability poses severe risks to financial institutions and their customers by potentially enabling complete compromise of banking communication channels. Attackers could use this vulnerability to redirect transactions to fraudulent accounts, modify payment instructions, or gain unauthorized access to sensitive financial data. The impact extends beyond immediate financial losses to include regulatory compliance violations, reputational damage, and potential legal consequences for organizations that fail to protect their cryptographic infrastructure. The vulnerability's persistence across multiple versions suggests that organizations may have been exposed to risk for extended periods without proper detection or remediation.
Organizations should implement immediate mitigations including comprehensive review and strengthening of private key access controls, deployment of network monitoring solutions to detect anomalous communication patterns, and implementation of robust key management practices. The vulnerability aligns with CWE-310, which addresses cryptographic weaknesses, and demonstrates characteristics consistent with ATT&CK technique T1552.004 for unsecured credentials. Security teams must conduct thorough assessments of their cryptographic implementations, ensure proper key rotation procedures, and verify that all security patches are properly applied. Additionally, organizations should consider implementing additional authentication layers and continuous monitoring to detect potential exploitation attempts, as the vulnerability's nature suggests it may be difficult to detect through conventional means.