CVE-2007-4539 in Bugzilla
Summary
by MITRE
The WebService (XML-RPC) interface in Bugzilla 2.23.3 through 3.0.0 does not enforce permissions for the time-tracking fields of bugs, which allows remote attackers to obtain sensitive information via certain XML-RPC requests, as demonstrated by the (1) Deadline and (2) Estimated Time fields.
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Analysis
by VulDB Data Team • 07/25/2019
The vulnerability described in CVE-2007-4539 represents a critical authorization flaw within the Bugzilla web service interface that affects versions 2.23.3 through 3.0.0. This issue manifests as a permission bypass in the XML-RPC service layer, where the system fails to properly validate user privileges when accessing time-tracking related bug fields. The vulnerability specifically targets the deadline and estimated time fields, which contain sensitive operational data about bug resolution timelines and resource allocation. Attackers can exploit this weakness to extract confidential information through carefully crafted XML-RPC requests without proper authentication or authorization. The flaw exists at the service layer abstraction, where the XML-RPC interface does not properly enforce the same permission controls that are typically applied to the web-based user interface, creating a dangerous inconsistency in the security model.
The technical implementation of this vulnerability stems from inadequate input validation and permission checking within the XML-RPC handler components of Bugzilla's web service framework. When remote attackers submit XML-RPC requests to access bug information, the system fails to verify whether the requesting user has appropriate clearance to view the time-tracking fields. This represents a classic case of insufficient authorization checks, where the XML-RPC service layer operates with reduced security controls compared to the standard web interface. The vulnerability is particularly concerning because it allows attackers to gather intelligence about project timelines, resource allocation, and team capacity planning through seemingly legitimate service calls. The flaw can be categorized under CWE-285, which addresses improper authorization in software systems, and specifically relates to the lack of proper access control enforcement in remote procedure call interfaces.
The operational impact of this vulnerability extends beyond simple information disclosure, as the time-tracking data can provide attackers with valuable insights into organizational workflows, resource constraints, and project management strategies. Attackers can use the extracted deadline and estimated time information to understand team capacity, identify critical project milestones, and potentially exploit this knowledge for social engineering attacks or competitive intelligence gathering. The vulnerability affects organizations that rely on Bugzilla for issue tracking and project management, where the disclosure of time estimates and deadlines could compromise strategic planning processes and resource allocation decisions. This type of information leakage can be particularly damaging in environments where project timelines and resource constraints are considered sensitive business information, as demonstrated by ATT&CK technique T1005 which covers data from local systems.
Organizations affected by this vulnerability should implement immediate mitigations including applying the official Bugzilla patches released for versions 3.0.1 and later, which properly enforce authorization checks for time-tracking fields in the XML-RPC interface. Additionally, administrators should review and tighten access controls for XML-RPC services, ensuring that only authorized users can access sensitive bug fields. Network segmentation and firewall rules can help limit access to the XML-RPC endpoints to trusted IP addresses or ranges. The vulnerability highlights the importance of maintaining consistent security controls across all interface layers of applications, as the disparity between web and service layer permissions created the exploitable condition. Regular security assessments of API endpoints and service interfaces should be conducted to identify similar authorization gaps, and implementing proper logging and monitoring of XML-RPC access patterns can help detect unauthorized access attempts. The remediation process should also include comprehensive testing to ensure that permission enforcement works correctly across all supported Bugzilla versions and that no similar authorization bypasses exist in other service interfaces.