CVE-2010-2756 in Bugzilla
Summary
by MITRE
Search.pm in Bugzilla 2.19.1 through 3.2.7, 3.3.1 through 3.4.7, 3.5.1 through 3.6.1, and 3.7 through 3.7.2 allows remote attackers to determine the group memberships of arbitrary users via vectors involving the Search interface, boolean charts, and group-based pronouns.
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Analysis
by VulDB Data Team • 09/22/2021
The vulnerability identified as CVE-2010-2756 represents a significant information disclosure flaw within the Bugzilla bug tracking system that affects multiple versions from 2.19.1 through 3.2.7, 3.3.1 through 3.4.7, 3.5.1 through 3.6.1, and 3.7 through 3.7.2. This issue resides in the Search.pm component which handles the search functionality of the system, specifically exploiting weaknesses in how the application processes user group membership information through the search interface. The vulnerability enables remote attackers to indirectly determine the group memberships of arbitrary users by leveraging the boolean chart functionality and group-based pronouns that are part of the search parameter processing mechanisms.
The technical flaw stems from insufficient input validation and access control enforcement within the search module's handling of user group information. When users interact with the search interface and utilize boolean chart features, the system fails to properly validate or sanitize the group-based pronoun parameters that are used to filter search results. This allows attackers to craft specific search queries that, when processed through the vulnerable Search.pm module, reveal information about user group memberships without proper authorization. The vulnerability operates by exploiting the way the application's search engine processes and evaluates group membership data, effectively creating a side-channel information disclosure mechanism.
The operational impact of this vulnerability extends beyond simple information disclosure as it fundamentally compromises the confidentiality of user access control information within the Bugzilla system. Attackers can systematically determine which groups users belong to, potentially exposing sensitive organizational structures and access patterns that could be leveraged for further attacks. This information disclosure could enable attackers to identify privileged users, understand organizational security boundaries, and potentially plan more sophisticated attacks targeting specific user groups or administrative functions. The vulnerability is particularly concerning because it affects the core search functionality that is essential for normal operation, making it difficult to disable or mitigate without affecting system usability.
Organizations using affected Bugzilla versions should immediately implement mitigations including upgrading to patched versions that address the group membership validation issues in the Search.pm module. The vulnerability aligns with CWE-200, which describes information exposure, and could potentially be leveraged as part of broader attack chains that follow ATT&CK tactics including credential access and reconnaissance. System administrators should also consider implementing additional access controls and monitoring for unusual search pattern activities that might indicate exploitation attempts. The patch for this vulnerability typically involves strengthening input validation and access control checks within the search processing logic to ensure that group membership information is properly protected and only accessible to authorized users with appropriate privileges.