CVE-2023-6507 : Vulnerability Insights and Analysis

This CVE-2023-6507 informational article provides insights into a specific vulnerability affecting CPython 3.12.0 on POSIX platforms.

Understanding CVE-2023-6507

The vulnerability identified as CVE-2023-6507 impacts CPython 3.12.0 in the

subprocess

module when used on POSIX platforms. It was addressed with the release of CPython 3.12.1 and does not affect other stable versions.

What is CVE-2023-6507?

An issue was discovered in CPython 3.12.0 related to the

subprocess

module on POSIX platforms. When the

extra_groups=

parameter is utilized with an empty list as a value (

extra_groups=[]

), the logic fails to execute

setgroups(0, NULL)

before calling

exec()

. This results in not dropping the original process's groups before launching the new process. The vulnerability specifically impacts CPython processes run with adequate privilege to initiate the

setgroups

system call, typically requiring 'root' access.

The Impact of CVE-2023-6507

The severity of CVE-2023-6507 is rated as MEDIUM with a CVSS base score of 6.1. The vulnerability falls under CAPEC-122 - Privilege Abuse. It presents a scenario where an attacker with high privileges could potentially exploit the improper privilege management to compromise confidentiality and integrity.

Technical Details of CVE-2023-6507

This section delves into the technical aspects of the CVE-2023-6507 vulnerability, providing crucial information for understanding its implications and scope.

Vulnerability Description

The vulnerability in CPython 3.12.0 arises when using the

extra_groups=

parameter with an empty list, leading to inadequate dropping of original processes' groups before initiating a new process.

Affected Systems and Versions

CPython versions less than 3.12.1 and 3.13.0a1 are impacted by this vulnerability when used on POSIX platforms.

Exploitation Mechanism

The vulnerability can be exploited by malicious actors with high privileges to abuse the improper privilege management, compromising system confidentiality and integrity.

Mitigation and Prevention

To mitigate the risks associated with CVE-2023-6507, users should take immediate and long-term security measures to secure their systems effectively.

Immediate Steps to Take

Users are advised to update their CPython installations to version 3.12.1 or higher to address this vulnerability.
Avoid using the

extra_groups=

parameter with an empty list as a value to prevent the exploit of this issue.

Long-Term Security Practices

Implement the principle of least privilege to restrict unnecessary access and minimize the impact of privilege escalation attacks.
Regularly monitor and audit system processes to detect any abnormal behavior that could indicate a security breach.

Patching and Updates

Stay informed about security advisories from Python Software Foundation and promptly apply patches and updates to mitigate potential vulnerabilities.