CVE-2014-3617 in Moodle
Summary
by MITRE
The forum_print_latest_discussions function in mod/forum/lib.php in Moodle through 2.4.11, 2.5.x before 2.5.8, 2.6.x before 2.6.5, and 2.7.x before 2.7.2 allows remote authenticated users to bypass the individual answer-posting requirement without the mod/forum:viewqandawithoutposting capability, and discover an author s username, by leveraging the student role and visiting a Q&A forum.
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Analysis
by VulDB Data Team • 06/07/2017
The vulnerability described in CVE-2014-3617 represents a significant security flaw within the Moodle learning management system that affects multiple versions from 2.4.11 through 2.7.1. This issue resides in the forum_print_latest_discussions function located in mod/forum/lib.php, which is a core component responsible for displaying forum discussions. The vulnerability specifically targets the Q&A forum functionality and exploits a privilege escalation weakness that allows authenticated users to bypass intended access controls. The flaw enables attackers to circumvent the requirement that normally prevents users from viewing responses until they have posted their own contribution to the discussion, which is a fundamental security mechanism designed to encourage participation before revealing content.
The technical implementation of this vulnerability stems from inadequate access control validation within the forum module's display logic. When users with the student role access a Q&A forum, the system should normally enforce the requirement that they must first post a response before being able to see other participants' replies. However, the flaw in the forum_print_latest_discussions function fails to properly verify whether the user possesses the necessary capability mod/forum:viewqandawithoutposting, which is typically restricted to instructors and administrators. This oversight allows any authenticated student user to bypass these protections and access the complete discussion thread, including responses from other participants, even without having made their own contribution to the forum.
The operational impact of this vulnerability extends beyond simple information disclosure, as it fundamentally undermines the intended pedagogical approach of Q&A forums within educational environments. The ability to discover authors' usernames without contributing to discussions creates a significant privacy risk, as it allows students to identify who has participated in specific discussions, potentially exposing their academic activities and participation patterns. From a security perspective, this vulnerability enables reconnaissance activities where attackers can gather information about forum participants, which may be used for social engineering or targeted attacks against specific users. The flaw also violates the principle of least privilege by allowing unauthorized access to content that should remain restricted until proper participation requirements are met, creating an information leakage scenario that could be exploited in various attack vectors.
Organizations using affected Moodle versions should immediately implement mitigations including updating to patched versions of the software, which were released to address this specific vulnerability. The remediation process should involve comprehensive testing of forum configurations to ensure that access controls are properly enforced for all forum types, particularly Q&A forums. Security administrators should also review and validate the capability assignments for different user roles to prevent unintended access to restricted forum features. This vulnerability aligns with CWE-284, which addresses improper access control, and maps to ATT&CK technique T1068, which involves exploiting privileges to gain unauthorized access to resources. Organizations should consider implementing network monitoring to detect unusual access patterns in forum modules and establish proper access control policies that align with educational institution security requirements. The vulnerability demonstrates the critical importance of proper input validation and access control implementation in web applications, particularly in educational platforms where user privacy and academic integrity are paramount considerations.