CVE-2016-3039 in Traveler
Summary
by MITRE
IBM Traveler 8.x and 9.x before 9.0.1.12 allows remote authenticated users to read arbitrary files or cause a denial of service (memory consumption) via XML data containing an external entity declaration in conjunction with an entity reference, related to an XML External Entity (XXE) issue.
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Analysis
by VulDB Data Team • 03/01/2019
IBM Traveler 8.x and 9.x versions prior to 9.0.1.12 contain a critical XML External Entity vulnerability that enables remote authenticated attackers to exploit a weakness in the application's XML processing capabilities. This vulnerability stems from insufficient input validation and improper handling of external entity declarations within XML data structures, creating an attack surface that can be leveraged for unauthorized data access and system disruption. The flaw specifically manifests when the application processes XML content that includes external entity declarations, combined with entity references that trigger the processing of these external resources.
The technical implementation of this vulnerability falls under CWE-611, which classifies it as an Improper Restriction of XML External Entity Reference. The attack vector requires an authenticated user account, but once compromised, the malicious actor can manipulate XML parsers to reference external resources that may be located on internal networks or accessible file systems. This XXE vulnerability allows for arbitrary file reading capabilities, potentially exposing sensitive configuration files, user data, or system credentials stored in accessible locations. Additionally, the vulnerability can be exploited to cause denial of service conditions by consuming excessive memory resources through malicious entity references that trigger recursive processing or large data retrieval operations.
From an operational impact perspective, this vulnerability represents a significant risk to organizations relying on IBM Traveler for email and calendar services, as it provides a pathway for attackers to access confidential business information while potentially disrupting service availability. The authenticated nature of the attack means that attackers must first obtain valid credentials, but once achieved, the impact extends beyond simple privilege escalation to include data exfiltration and system resource exhaustion. The vulnerability affects both major versions of IBM Traveler, indicating a widespread exposure across deployments that may have been running for extended periods without proper patching.
The attack pattern aligns with ATT&CK technique T1059.008 for XML External Entity Processing, where adversaries leverage XML parsing functionality to execute malicious payloads or extract information. Security professionals should consider implementing input validation controls at multiple layers including application-level XML parser configuration, network-level filtering, and endpoint protection measures. Organizations should prioritize immediate patch deployment to version 9.0.1.12 or later, while also implementing monitoring for unusual XML processing patterns or unexpected file access attempts. Additional mitigations include disabling external entity processing in XML parsers, implementing strict XML schema validation, and conducting regular security assessments to identify similar vulnerabilities in other applications that process external XML content.