CVE-2024-35539 in Typecho
Summary
by MITRE • 08/20/2024
Typecho v1.3.0 was discovered to contain a race condition vulnerability in the post commenting function. This vulnerability allows attackers to post several comments before the spam protection checks if the comments are posted too frequently.
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Analysis
by VulDB Data Team • 08/04/2025
The vulnerability identified as CVE-2024-35539 affects Typecho version 1.3.0 and represents a critical race condition flaw within the comment posting mechanism. This issue stems from the improper sequencing of operations during comment submission where the system fails to adequately enforce rate limiting controls before processing user-generated content. The race condition occurs when multiple comment requests are processed concurrently without proper synchronization mechanisms to verify that spam protection measures have been properly executed. This fundamental flaw in the application's concurrency handling creates an exploitable window where malicious actors can overwhelm the comment system by submitting numerous posts in rapid succession before the anti-spam safeguards can effectively intervene.
The technical implementation of this vulnerability exposes a significant weakness in the application's input validation and rate limiting architecture. When users submit comments through the web interface, the system should enforce temporal controls to prevent excessive posting rates that could indicate automated spam activity. However, the race condition allows attackers to bypass these protective measures by exploiting the timing gap between comment submission and spam detection. The vulnerability specifically impacts the post commenting function where the application processes user input without sufficient coordination between the submission process and the spam protection verification steps. This flaw falls under the broader category of race condition vulnerabilities classified as CWE-362, which describes the condition where two or more threads or processes access shared resources concurrently, leading to unpredictable behavior or security weaknesses. The improper handling of concurrent operations in this context creates an environment where attackers can manipulate the system's timing-sensitive security controls.
The operational impact of CVE-2024-35539 extends beyond simple spam accumulation to potentially enable more sophisticated attack vectors within the Typecho platform. Attackers can leverage this vulnerability to flood comment sections with malicious content, potentially leading to denial of service conditions for legitimate users attempting to engage with the platform's content. The vulnerability creates an opportunity for attackers to perform automated comment spamming campaigns that could degrade system performance and compromise the user experience. Additionally, the race condition may enable bypassing other security controls that depend on proper timing sequences, potentially allowing for more advanced exploitation techniques. From an attacker's perspective, this vulnerability aligns with techniques described in the MITRE ATT&CK framework under the T1499 category, which involves the exploitation of system weaknesses to disrupt service availability or manipulate data integrity. The vulnerability can be particularly damaging in environments where comment moderation is critical for maintaining content quality and platform reputation.
Mitigation strategies for CVE-2024-35539 require immediate implementation of proper synchronization mechanisms within the comment processing pipeline. Organizations should ensure that all comment submission operations enforce strict temporal controls and implement robust concurrency management to prevent the race condition from being exploited. The recommended approach involves implementing atomic operations that ensure spam protection checks occur before comment processing begins, eliminating the timing window that attackers currently exploit. System administrators should also consider implementing additional rate limiting controls that operate at multiple levels including IP-based restrictions, user session tracking, and content analysis mechanisms. The fix should address the underlying race condition by ensuring that comment submission and spam detection processes are properly synchronized to prevent concurrent access to shared resources. Security teams should monitor comment sections for unusual activity patterns and implement automated detection systems that can identify potential exploitation attempts. Furthermore, updating to a patched version of Typecho that addresses this specific race condition vulnerability is essential for maintaining platform security and preventing unauthorized comment flooding attacks that could compromise the integrity of user-generated content systems.