CVE-2021-3578 : Security Advisory and Response
Learn about CVE-2021-3578, a critical flaw in mbsync versions before v1.3.6 and v1.4.2 allowing remote code execution. Take immediate steps to update and secure your systems.
A flaw was found in mbsync versions before v1.3.6 and v1.4.2. This vulnerability allows a malicious or compromised server to execute remote code on the client by writing an arbitrary integer value past the end of a heap-allocated structure. To exploit this flaw, the attacker issues an unexpected APPENDUID response.
Understanding CVE-2021-3578
This CVE identifies a critical vulnerability in the isync software that could lead to remote code execution.
What is CVE-2021-3578?
CVE-2021-3578 is a security flaw present in mbsync versions before v1.3.6 and v1.4.2. It arises due to an unchecked pointer cast that allows attackers to write values beyond a specified limit, potentially leading to remote code execution.
The Impact of CVE-2021-3578
Exploiting CVE-2021-3578 can result in remote code execution on the victim's system. Attackers can leverage this vulnerability to compromise client systems through a malicious or compromised server.
Technical Details of CVE-2021-3578
This section delves deeper into the technical aspects of the CVE.
Vulnerability Description
The unchecked pointer cast in mbsync versions before v1.3.6 and v1.4.2 enables attackers to write an arbitrary integer value past the end of a heap-allocated structure by sending an unexpected APPENDUID response.
Affected Systems and Versions
The affected product is isync, with versions 1.3.6 and 1.4.2 confirmed to be vulnerable to this exploit.
Exploitation Mechanism
The vulnerability in isync can be exploited by a malicious actor or compromised server sending a specific APPENDUID response, allowing them to trigger remote code execution on the client.
Mitigation and Prevention
To safeguard systems from CVE-2021-3578, proactive measures need to be taken.
Immediate Steps to Take
Users are advised to update to mbsync version 1.3.6 or later to mitigate the vulnerability. It is crucial to install patches promptly to prevent potential remote code execution.
Long-Term Security Practices
Implementing secure coding practices and regular security audits can help identify and address similar vulnerabilities in the future.
Patching and Updates
Stay informed about security updates and apply patches released by the software provider to address known vulnerabilities effectively.