CVE-2018-20992 in claxon Crate
Summary
by MITRE
An issue was discovered in the claxon crate before 0.4.1 for Rust. Uninitialized memory can be exposed because certain decode buffer sizes are mishandled.
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Analysis
by VulDB Data Team • 12/04/2023
The vulnerability identified as CVE-2018-20992 affects the claxon crate version 0.4.1 and earlier in the Rust programming language ecosystem. This issue represents a memory safety concern that can potentially expose uninitialized memory segments to attackers, creating a significant security risk for applications that utilize this crate for audio processing operations. The problem manifests specifically within the decode buffer management mechanisms of the claxon library, which is commonly used for decoding audio files in rust applications. The vulnerability stems from improper handling of buffer sizing operations during the decoding process, creating opportunities for information disclosure through memory exposure.
The technical flaw lies in the mishandling of decode buffer sizes where the crate fails to properly initialize memory buffers before processing audio data. This uninitialized memory exposure occurs because the software does not adequately zero out or properly allocate memory regions before use, allowing residual data from previous operations to remain accessible. When audio files are processed through the claxon crate, the improper buffer management can cause previously allocated memory segments to contain remnants of sensitive information, potentially including cryptographic keys, user data, or system information. This type of vulnerability falls under the CWE-128 category of uninitialized Memory Access, which is classified as a memory safety issue in the Common Weakness Enumeration framework. The flaw essentially creates a path for attackers to potentially extract sensitive data through memory reads that should have been protected.
The operational impact of this vulnerability extends across various rust applications that depend on the claxon crate for audio decoding functionality, particularly those handling sensitive audio content or operating in environments where information disclosure could lead to further exploitation. Applications that process user-uploaded audio files, streaming services, or multimedia applications using this crate may be at risk of exposing uninitialized memory segments containing sensitive data. The vulnerability can be exploited through crafted audio files that trigger the problematic buffer handling code path, potentially allowing attackers to extract information from memory that should remain confidential. This type of information disclosure vulnerability aligns with ATT&CK technique T1005 for Data from Local System, where adversaries can access memory contents to extract sensitive information. The risk is particularly concerning in environments where the affected applications process files from untrusted sources, as attackers could craft malicious audio files to trigger memory exposure.
Mitigation strategies for CVE-2018-20992 primarily involve updating to claxon version 0.4.1 or later, which includes proper buffer initialization and size management. System administrators and developers should conduct thorough dependency audits to identify all applications using the affected crate and ensure timely updates across their software ecosystems. Additionally, implementing proper input validation for audio files and employing memory safety practices such as using safe memory allocation patterns can provide additional defense-in-depth measures. Organizations should also consider implementing monitoring for unusual memory access patterns that could indicate exploitation attempts. The fix typically involves ensuring that all buffer allocations are properly initialized before use and that buffer sizes are validated against expected ranges to prevent memory exposure scenarios. Security teams should prioritize this vulnerability in their patch management cycles, particularly for applications processing sensitive audio content or operating in high-security environments where information disclosure could have severe consequences.