In the standard library in Rust before 1.52.0, a double free can occur in the Vec::from_iter function if freeing the element panics. This critical vulnerability, identified as CVE-2021-31162, has a CVSS score of 9.8, indicating severe risk to organizations.
The vulnerability is classified as critical due to its potential impact on confidentiality, integrity, and availability. Attackers may leverage this flaw to execute arbitrary code or disrupt service, posing a significant threat to systems utilizing the affected versions of Rust. Organizations should prioritize patching immediately.
As of now, there is no public exploit confirmed for this vulnerability, reducing the immediate risk of exploitation. However, the nature of the flaw means that it could be exploited under specific circumstances, emphasizing the need for timely remediation.
To effectively mitigate this risk, organizations must address this vulnerability in their patch management processes and remain vigilant for any related updates from Rust and Fedora.
Vulnerability Details
CVE-2021-31162 describes a critical double free vulnerability in the Rust standard library that exists in versions prior to 1.52.0. Specifically, the issue arises in the Vec::from_iter function when a panic occurs during the freeing of elements. This can lead to significant security implications, as malicious actors may exploit this to execute arbitrary code.
The CVSS score of 9.8 categorizes this vulnerability as critical, indicating a high likelihood of exploitation, severe impact on affected systems, and the need for immediate remediation.
It affects multiple distributions, including Fedora versions 32, 33, and 34. The vulnerability is categorized under CWE-415, which refers to 'Double Free'.
Technical Analysis
The root cause of CVE-2021-31162 is a programming error in the handling of memory management within the Rust standard library. Specifically, the double free occurs when the function attempts to free memory that has already been released due to a panic in the freeing process.
This vulnerability can be exploited remotely, as it is part of a library commonly used in network applications. The attack complexity is low, requiring no special privileges or user interaction to exploit, making it a critical concern for developers and system administrators.
With high confidentiality, integrity, and availability impact, organizations must recognize the potential for severe disruption or unauthorized access to sensitive data if this vulnerability is not addressed.
Risk & Impact Analysis
Risk to organizations includes potential data loss, unauthorized access to critical systems, and disruption of services. The critical nature of this vulnerability requires immediate attention from organizations to secure their Rust-based applications and underlying systems.
The exploitability score indicates a moderate likelihood of exploitation, but the potential impact remains high. Organizations should assess their exposure to this vulnerability, particularly if they utilize affected versions of Rust in their applications.
With the vulnerability not included in the KEV catalog, organizations should not rely on external notifications and must actively monitor their systems for vulnerabilities.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The following versions of Rust are affected by this vulnerability: all versions prior to 1.52.0, specifically targeting versions 1.48.0 to 1.51.0. Additionally, Fedora versions 32, 33, and 34 are also vulnerable.
Mitigation & Remediation
Organizations should upgrade to the latest version of Rust (1.52.0 or later) to mitigate this vulnerability. If immediate upgrading is not feasible, consider implementing workarounds such as avoiding panic-inducing operations during vector manipulations.
For further security improvements, organizations should apply configuration hardening and implement network controls to limit exposure to potential threats.
To validate the effectiveness of applied fixes, organizations should engage in penetration testing and continual monitoring.
Detection Guidance
To detect potential exploitation of this vulnerability, organizations should monitor logs for unusual memory management patterns or crashes related to Rust applications. Behavioral anomalies during runtime, especially during vector manipulations, should also be noted.
Implementing network signatures that can identify suspicious activity related to this vulnerability is recommended. Regular audits of system changes can also aid in uncovering attempts to exploit this flaw.
AppSecure Threat Intelligence Insight
CVE-2021-31162 represents a critical vulnerability that highlights the importance of robust memory management in programming languages. As organizations increasingly rely on Rust for systems programming, understanding vulnerabilities like this is crucial.
The lack of known exploits currently suggests a temporary window of opportunity for organizations to address this issue proactively. Security teams should take this incident as a learning opportunity to enhance their coding practices and vulnerability management strategies.
For further reading on securing Rust applications, organizations may refer to the following resources: Rust security best practices and secure coding practices.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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