CVE-2020-36646 in ZenLib
Summary
by MITRE • 01/09/2023
A vulnerability classified as problematic has been found in MediaArea ZenLib up to 0.4.38. This affects the function Ztring::Date_From_Seconds_1970_Local of the file Source/ZenLib/Ztring.cpp. The manipulation of the argument Value leads to unchecked return value to null pointer dereference. Upgrading to version 0.4.39 is able to address this issue. The name of the patch is 6475fcccd37c9cf17e0cfe263b5fe0e2e47a8408. It is recommended to upgrade the affected component. The identifier VDB-217629 was assigned to this vulnerability.
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Analysis
by VulDB Data Team • 01/30/2023
The vulnerability identified as CVE-2020-36646 represents a critical null pointer dereference issue within MediaArea ZenLib version 0.4.38 and earlier. This flaw exists in the Ztring::Date_From_Seconds_1970_Local function located in Source/ZenLib/Ztring.cpp, where improper handling of input arguments creates a pathway for attackers to exploit unchecked return values. The vulnerability classification as problematic indicates significant security implications that could compromise system integrity and availability. The issue stems from the function's failure to validate return values from underlying operations, specifically when processing time-related data conversions from Unix timestamps. This particular function is designed to convert seconds since epoch into local date representations, making it a critical component in multimedia processing applications that rely on accurate timestamp handling.
The technical exploitation of this vulnerability occurs when an attacker provides malformed input to the Date_From_Seconds_1970_Local function, causing the function to return a null pointer that is subsequently dereferenced without proper validation. This pattern aligns with CWE-476, which describes null pointer dereference vulnerabilities, and represents a classic example of improper error handling in software development. The unchecked return value scenario creates a condition where the application assumes a successful operation while the underlying function has actually failed, leading to a crash or potential code execution. The vulnerability is particularly dangerous because it can be triggered through normal input processing operations, making it difficult to detect and prevent through conventional means.
The operational impact of this vulnerability extends beyond simple application crashes, as it can potentially enable more sophisticated attack vectors including denial of service conditions that disrupt legitimate system operations. When exploited, this vulnerability can cause applications using MediaArea ZenLib to terminate unexpectedly, which may be particularly problematic in production environments where continuous operation is critical. The vulnerability affects any software that depends on ZenLib for processing multimedia metadata, including media players, transcoding applications, and content management systems. From an attacker's perspective, this represents a low-effort means of achieving system instability, which could be leveraged as part of broader attack campaigns or as a stepping stone for more advanced exploitation techniques. The vulnerability's presence in a widely used library means that multiple applications across different platforms could be simultaneously affected.
The recommended mitigation strategy involves upgrading to MediaArea ZenLib version 0.4.39, which includes the patch identified by the commit hash 6475fcccd37c9cf17e0cfe263b5fe0e2e47a8408. This upgrade addresses the root cause by implementing proper validation of return values and ensuring that null pointer conditions are handled gracefully. The patch demonstrates the importance of following secure coding practices and adhering to the principle of least privilege in software development. Organizations should prioritize this upgrade as part of their vulnerability management processes, particularly in environments where multimedia processing applications are deployed. Additionally, system administrators should consider implementing monitoring solutions to detect potential exploitation attempts and ensure that all affected applications are updated promptly. The vulnerability also highlights the necessity of regular security assessments and code reviews to identify similar patterns in other components of the software supply chain, as demonstrated by the ATT&CK framework's emphasis on software supply chain compromises and the importance of maintaining secure development practices throughout the software lifecycle.