CVE-2005-4725 in Geeklog
Summary
by MITRE
Geeklog before 1.3.11sr3 allows remote attackers to bypass intended access restrictions and comment on an arbitrary story or topic by guessing the story ID.
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Analysis
by VulDB Data Team • 07/16/2018
The vulnerability described in CVE-2005-4725 represents a critical access control flaw in the Geeklog content management system version 1.3.11sr2 and earlier. This issue stems from inadequate input validation and predictable identifier generation mechanisms that allow unauthorized users to manipulate the system's comment functionality. The vulnerability specifically affects the comment submission process where the system relies on story IDs to determine which content can be commented upon. Attackers can exploit this weakness by simply guessing or enumerating valid story IDs, thereby bypassing the intended access restrictions that should prevent unauthorized commenting on specific content items.
The technical implementation of this vulnerability demonstrates a classic case of insufficient access control validation within the application's core functionality. When users attempt to submit comments, the system should verify that the commenting user has appropriate permissions for the target story or topic. However, in affected versions of Geeklog, the application fails to perform proper authorization checks before accepting comment submissions. The story ID parameter is processed without adequate validation, allowing attackers to manipulate the input to point to any valid story within the system's database. This flaw creates a direct pathway for malicious actors to post comments on content they should not have access to, potentially including sensitive or restricted material.
The operational impact of this vulnerability extends beyond simple comment manipulation, as it represents a fundamental breakdown in the application's security model. Attackers can leverage this weakness to post spam comments, malicious content, or inappropriate material on arbitrary stories, potentially damaging the reputation of the website and its users. The vulnerability also enables information disclosure attacks where attackers might gain insights into the system's internal structure through comment submission attempts. Furthermore, this flaw can be exploited as part of broader attack campaigns, such as social engineering efforts or content poisoning attacks that aim to manipulate public perception or disrupt the platform's integrity. The predictable nature of story ID generation makes this vulnerability particularly dangerous as it requires minimal effort to exploit, potentially allowing for automated attacks.
Mitigation strategies for this vulnerability should focus on implementing robust input validation and access control mechanisms throughout the application's comment submission process. The system must validate that each comment submission is authorized for the specific story ID provided, ensuring that users cannot bypass the intended access restrictions through simple input manipulation. Security patches should enforce proper authentication checks before allowing comment submission, and the application should implement randomized or non-guessable story identifiers where possible. Additionally, administrators should monitor comment submission patterns for unusual activity that might indicate exploitation attempts. This vulnerability aligns with CWE-285, which addresses improper authorization in access control systems, and could be categorized under ATT&CK technique T1078 for valid accounts and T1566 for credential harvesting through social engineering. The fix requires implementing proper access control checks and ensuring that story ID validation occurs before any comment processing logic is executed, preventing unauthorized users from submitting content to restricted areas of the system.