CVE-2014-1626 in Marc-xml
Summary
by MITRE
XML External Entity (XXE) vulnerability in MARC::File::XML module before 1.0.2 for Perl, as used in Evergreen, Koha, perl4lib, and possibly other products, allows context-dependent attackers to read arbitrary files via a crafted XML file.
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Analysis
by VulDB Data Team • 05/21/2017
The CVE-2014-1626 vulnerability represents a critical XML External Entity processing flaw that affected multiple library management systems and perl libraries. This vulnerability resides within the MARC::File::XML module version 1.0.1 and earlier, which served as a core component in various open-source library automation platforms including Evergreen and Koha. The vulnerability stems from insufficient input validation during XML parsing operations, specifically when processing XML documents that contain external entity references. Attackers could exploit this weakness by crafting malicious XML files that reference local system resources through external entity declarations, thereby enabling unauthorized file access to sensitive system files that should remain protected.
The technical exploitation of this XXE vulnerability follows established patterns described in CWE-611, which categorizes external entity processing flaws as a significant security concern. When the vulnerable perl modules parse XML documents containing malicious entity references, the XML parser attempts to resolve these external entities by accessing the specified file paths on the local filesystem. This behavior creates a direct pathway for attackers to extract arbitrary files from the server, potentially including configuration files, database credentials, system logs, or other sensitive data. The vulnerability is context-dependent because it requires the attacker to have the ability to inject malicious XML content into the parsing process, typically through user input or file upload mechanisms that are processed by the affected modules.
The operational impact of CVE-2014-1626 extends beyond simple information disclosure, as it can enable more sophisticated attacks within library management environments. Organizations using affected systems faced potential exposure of patron data, internal system configurations, and administrative credentials stored in accessible files. The vulnerability's presence in widely-used platforms like Evergreen and Koha meant that numerous library systems worldwide were potentially at risk, creating a cascading security concern for the entire library automation ecosystem. Security researchers have documented similar patterns in ATT&CK framework under the technique T1074 for data staging and T1566 for credential access through exploitation of XML parsing vulnerabilities. The attack surface was particularly concerning because library systems often contain sensitive personal information and institutional data that could be valuable to threat actors.
Mitigation strategies for this vulnerability required immediate patching of the affected MARC::File::XML module to version 1.0.2 or later, which implemented proper XML entity validation and restricted external entity resolution. Organizations should have also implemented input sanitization measures for XML processing, configured XML parsers to disable external entity resolution entirely, and established monitoring for suspicious XML file processing activities. The vulnerability highlighted the importance of secure XML processing practices and led to broader industry awareness of XXE risks in perl-based applications. System administrators needed to conduct thorough vulnerability assessments across their library management systems to identify all potential attack vectors and ensure comprehensive remediation. Additionally, implementing network segmentation and access controls around library automation systems could have limited the potential impact of successful exploitation attempts.