CVE-2019-9948 : Security Advisory and Response

Python 2.x through 2.7.16 is affected by a vulnerability that allows remote attackers to bypass security restrictions using the urllib module.

Understanding CVE-2019-9948

This CVE involves a security issue in Python 2.x through 2.7.16 related to the urllib module.

What is CVE-2019-9948?

Python 2.x through 2.7.16 includes the urllib module, which supports the local_file: scheme. This vulnerability can be exploited by malicious individuals to bypass security measures that restrict the use of file: URIs.

The Impact of CVE-2019-9948

The vulnerability allows remote attackers to circumvent security measures by triggering specific urllib function calls, potentially leading to unauthorized access to sensitive files.

Technical Details of CVE-2019-9948

This section provides more in-depth technical information about the CVE.

Vulnerability Description

The urllib module in Python 2.x through 2.7.16 supports the local_file: scheme, enabling remote attackers to bypass protection mechanisms that blacklist file: URIs.

Affected Systems and Versions

Product: Python 2.x through 2.7.16
Vendor: N/A
Version: N/A

Exploitation Mechanism

Malicious actors can exploit this vulnerability by utilizing the urllib.urlopen('local_file:///etc/passwd') function call to bypass security restrictions.

Mitigation and Prevention

Protect your systems from CVE-2019-9948 with the following steps:

Immediate Steps to Take

Update Python to a secure version that addresses the vulnerability.
Implement network security measures to detect and block malicious requests.

Long-Term Security Practices

Regularly monitor and audit your system for unauthorized access attempts.
Educate users on safe coding practices to prevent similar vulnerabilities.

Patching and Updates

Ensure timely installation of security patches and updates for Python to mitigate the risk of exploitation.