Hello LinuxPatch readers! Today we're breaking down a critical security topic that's especially relevant for developers and network administrators working with Python. We're talking about CVE-2019-9740, a security flaw identified in one of Python's core libraries: urllib (including urllib2).
What is CVE-2019-9740?
CVE-2019-9740 is a security vulnerability discovered in Python's urllib module, affecting versions Python 2.x through 2.7.16 and Python 3.x through 3.7.3. The issue centers around CRLF (Carriage Return Line Feed) injection, which could occur if an attacker has control over a URL parameter. This particularly involves manipulations with the query string — anything after the '?' in a URL — that could lead to HTTP header injections or even executing commands in databases like Redis.
Severity and Risks
The Common Vulnerability Scoring System (CVSS) has rated this vulnerability with a medium severity score of 6.1. While it may not be the highest score, the potential impact is significant enough to warrant immediate attention. A successful CRLF injection can enable an attacker to alter server response headers, create new headers, or perform other malicious tasks, effectively compromising the integrity of web applications.
The Software Affected
Urllib is a Python library used for fetching URLs. It is a tool indispensable in many applications, ranging from simple web scrapping tools to major web data interaction and retrieval operations within various software including web applications, bots and automation scripts.
Remedial Actions: Updates & Patches
Python's response to this vulnerability was to release new patched versions for affected Python releases. The immediate patches were issued in version sets 2.7.17, 3.5.10, 3.6.10, and 3.7.4, among others. If you or your organization are using an outdated version of Python that falls within the vulnerable range, it is highly recommended to upgrade to the latest fixed version immediately to ensure your applications and services remain secure.
How to Stay Protected
For those maintaining systems or applications that depend on Python, incorporating a regular update and patch management routine is crucial. Tools like LinuxPatch can automate and simplify these tasks, ensuring your systems are always up to date with minimal manual oversight. For more information on how LinuxPatch can assist in managing such vulnerabilities efficiently, visit our website.
In conclusion, CVE-2019-9740 is a potent reminder of the ongoing need for vigilance and proactive security measures in software maintenance. Updated libraries are available to mitigate this vulnerability, so take action to update your systems. Be secure, be safe!