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CVE-2021-21814 : Exploit Details and Defense Strategies

Learn about CVE-2021-21814, a high-severity vulnerability in AT&T Labs Xmill 0.7 allowing attackers to trigger a stack-based buffer overflow. Understand the impact and mitigation steps.

This article provides detailed information about CVE-2021-21814, a vulnerability that allows an attacker to trigger a stack-based buffer overflow in AT&T Labs Xmill 0.7.

Understanding CVE-2021-21814

CVE-2021-21814 is a vulnerability in the HandleFileArg function, allowing attackers to exploit a stack-based buffer overflow in AT&T Labs Xmill 0.7.

What is CVE-2021-21814?

The vulnerability arises from user-controlled input passed via the command line, leading to a buffer overflow that can be exploited by a malicious actor.

The Impact of CVE-2021-21814

With a CVSS base score of 7.8, this high-severity vulnerability poses risks to confidentiality, integrity, and availability. An attacker can execute arbitrary code by providing crafted input.

Technical Details of CVE-2021-21814

This section delves into the specifics of the CVE, from the nature of the vulnerability to affected systems and the exploitation mechanism.

Vulnerability Description

The issue lies in the failure to validate user input length, resulting in a buffer overflow. Specifically, the issue stems from how filepattern is handled within HandleFileArg.

Affected Systems and Versions

AT&T Labs Xmill 0.7 is affected by this vulnerability, with versions prior to the patch being exposed to exploitation.

Exploitation Mechanism

By providing specially crafted input, an attacker can trigger the buffer overflow, gaining unauthorized access and potentially executing arbitrary code.

Mitigation and Prevention

To address CVE-2021-21814, immediate steps should be taken to secure affected systems and implement long-term security practices.

Immediate Steps to Take

It is crucial to apply the latest security patches released by AT&T to mitigate the vulnerability and prevent exploitation.

Long-Term Security Practices

Enhancing input validation procedures and conducting regular security audits can help prevent similar vulnerabilities in the future.

Patching and Updates

Regularly updating software and monitoring security bulletins from AT&T can assist in staying informed about new patches and security measures.

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