CVE-2021-3177 : Vulnerability Insights and Analysis
Learn about CVE-2021-3177, a buffer overflow vulnerability in Python 3.x through 3.9.1 that could lead to remote code execution. Find out about the impact, affected systems, and mitigation steps.
Python 3.x through 3.9.1 has a buffer overflow vulnerability in PyCArg_repr in _ctypes/callproc.c. This vulnerability could result in remote code execution in Python applications that accept floating-point numbers as input.
Understanding CVE-2021-3177
This section will provide insights into the nature and impact of CVE-2021-3177.
What is CVE-2021-3177?
CVE-2021-3177 is a buffer overflow vulnerability found in Python 3.x through 3.9.1. The flaw exists in PyCArg_repr in _ctypes/callproc.c and can lead to remote code execution in certain Python applications.
The Impact of CVE-2021-3177
Exploiting this vulnerability allows attackers to execute arbitrary code by providing a specific input, potentially compromising the security and integrity of Python applications.
Technical Details of CVE-2021-3177
In this section, we will delve into the technical aspects of CVE-2021-3177.
Vulnerability Description
The buffer overflow occurs in PyCArg_repr due to unsafe usage of the sprintf function, allowing an attacker to craft malicious input leading to remote code execution.
Affected Systems and Versions
Python versions 3.x through 3.9.1 are affected by this vulnerability. All systems utilizing these Python versions are at risk.
Exploitation Mechanism
Attackers can exploit this vulnerability by providing a specific argument, such as 1e300, to c_double.from_param, triggering the buffer overflow and potential code execution.
Mitigation and Prevention
In this section, we will discuss strategies for mitigating and preventing CVE-2021-3177.
Immediate Steps to Take
Users are advised to update their Python installations to a patched version beyond 3.9.1 to mitigate the risk of exploitation.
Long-Term Security Practices
Developers should sanitize input data, implement secure coding practices, and regularly apply security updates to prevent such vulnerabilities.
Patching and Updates
Regularly check for security advisories from Python and related vendors to stay informed about patches and updates addressing CVE-2021-3177.