CVE-2020-25795 in sized-chunks crate
Summary
by MITRE
An issue was discovered in the sized-chunks crate through 0.6.2 for Rust. In the Chunk implementation, insert_from can have a memory-safety issue upon a panic.
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Analysis
by VulDB Data Team • 09/20/2020
The vulnerability identified as CVE-2020-25795 resides within the sized-chunks crate version 0.6.2 and earlier, representing a memory safety concern that manifests during specific operational conditions. This crate serves as a utility for handling memory chunks in rust applications, and the flaw emerges within its Chunk implementation where the insert_from method encounters potential memory safety issues when a panic occurs. The issue stems from improper handling of memory operations during exceptional conditions, creating opportunities for undefined behavior that could compromise system integrity.
The technical flaw within the sized-chunks crate operates through the Chunk implementation's insert_from method which fails to properly manage memory resources when a panic condition is triggered. This memory safety vulnerability falls under the category of memory corruption issues, specifically affecting how the system handles memory allocation and deallocation during error conditions. When a panic occurs during the execution of insert_from, the memory management state becomes inconsistent, potentially leading to memory corruption or access violations that could be exploited by malicious actors.
The operational impact of this vulnerability extends beyond simple memory corruption, as it creates potential pathways for more severe security consequences within rust applications that utilize the affected crate. Attackers could potentially exploit this weakness to cause application crashes, memory corruption, or even execute arbitrary code depending on how the affected applications handle memory management. The vulnerability's presence in a widely used crate increases the potential attack surface significantly, as numerous rust applications may be susceptible to this memory safety issue. This represents a critical concern for systems where memory safety is paramount, particularly in environments where applications process untrusted data.
Mitigation strategies for CVE-2020-25795 should prioritize updating to the patched version of the sized-chunks crate, as this represents the most direct solution to address the underlying memory safety issue. System administrators and developers should conduct thorough dependency audits to identify all applications utilizing the affected crate and ensure prompt updates are deployed across their environments. The vulnerability's classification aligns with CWE-121, which addresses stack-based buffer overflow conditions, and may also relate to CWE-122, heap-based buffer overflow conditions, depending on how memory corruption manifests. Additionally, implementing proper panic handling and memory management practices within applications that use this crate can provide additional defense in depth measures. Organizations should consider implementing runtime monitoring and memory integrity checks to detect potential exploitation attempts and maintain compliance with security standards such as those outlined in the NIST Cybersecurity Framework and ISO/IEC 27001 for information security management.