CRLF Injection Vulnerability in Python 2 Package: python2
Summary
ALPINE-CVE-2019-18348: An issue was discovered in urllib2 in Python 2.x through 2.7.17 and urllib in Python 3.x through 3.8.0. Affects python2 versions < 2.7.18-r0. Fixed in 2.7.18-r0. How to fix ↓
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Background
The python2 package is a widely used implementation of the Python programming language, specifically version 2.x. It provides a robust environment for developing applications and scripts. However, it is known to have vulnerabilities that can be exploited if not properly managed. This specific vulnerability allows for CRLF (Carriage Return Line Feed) injection, which can lead to severe security issues if an attacker manipulates URL parameters.
Vulnerability Detail
An issue was discovered in urllib2 in Python 2.x through 2.7.17 and urllib in Python 3.x through 3.8.0. CRLF injection is possible if the attacker controls a URL parameter, as demonstrated by the first argument to urllib.request.urlopen with \r\n (specifically in the host component of a URL) followed by an HTTP header. This vulnerability is similar to other known issues and is not exploitable when glibc has CVE-2016-10739 fixed. The CVSS score for this vulnerability is 6.1, indicating a moderate severity level.
How To Fix
Minimum fixed version
2.7.18-r0
This is the first release that contains the fix.
sudo apk add --upgrade python2Tip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
As a temporary workaround, avoid using user-controlled input in URL parameters where possible. Implement input validation to sanitize any URL parameters before processing them.
Conclusion
The CRLF injection vulnerability in the python2 package poses a significant risk if not addressed. It is crucial for users to update to the patched version to mitigate potential security threats. Regular monitoring and vulnerability management practices, such as those offered by Vulert, can help maintain the security of your applications.
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FAQ
CRLF injection is a type of attack where an attacker can inject Carriage Return and Line Feed characters into a URL, potentially leading to HTTP response splitting and other security issues.
You can use the Vulert playground at Vulert Scanner to check if your application is affected by this vulnerability without needing to sign up.
Exploiting this vulnerability can allow attackers to manipulate HTTP headers, potentially leading to unauthorized actions or data exposure.
Yes, the vulnerability also affects urllib in Python 3.x through 3.8.0, so it is important to update to the patched versions for both Python 2 and Python 3.
The CVSS score for this vulnerability is 6.1, indicating a moderate level of severity.
References
Related vulnerabilities
Recent vulnerabilities recorded for python2.
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