Cross-Site Scripting Vulnerability in python-cjson Package
Summary
UBUNTU-CVE-2009-4924: Dan Pascu python-cjson 1.0.5 does not properly handle a ['/'] argument to cjson.encode, which makes it easier for remote attackers to conduct certain cross-site scripting (XSS) attacks involving Firefox and the end tag o... Affects python-cjson versions < 1.0.5-4build1. Fixed in 1.0.5-4build1. How to fix ↓
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Background
The python-cjson package is a Python library that provides a fast and efficient way to encode and decode JSON data. It is widely used in various applications for handling JSON data due to its performance advantages. However, the version 1.0.5 of python-cjson has a vulnerability that can be exploited by attackers to perform cross-site scripting (XSS) attacks, particularly affecting users of the Firefox browser.
Vulnerability Detail
The vulnerability arises from improper handling of a specific argument, namely ['/'], in the cjson.encode function. This flaw allows remote attackers to manipulate the output in such a way that they can inject malicious scripts into web pages viewed by unsuspecting users. The consequence of this vulnerability can lead to unauthorized actions being performed on behalf of the user, data theft, or other malicious activities.
How To Fix
Minimum fixed version
1.0.5-4build1
This is the first release that contains the fix.
sudo apt-get install --only-upgrade python-cjsonTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
As a temporary workaround, you can avoid using the cjson.encode function with the vulnerable argument until the package is updated. Additionally, consider implementing input validation and sanitization in your application to mitigate potential XSS attacks.
Conclusion
The python-cjson package has a medium-severity vulnerability that can lead to cross-site scripting attacks. It is crucial to update to the patched version to protect your application and users from potential threats. Implementing additional security measures can further mitigate risks.
See every vulnerability recorded for python-cjson →
FAQ
The vulnerability is a cross-site scripting (XSS) issue that occurs due to improper handling of specific input in the cjson.encode function.
If your application uses the vulnerable version of python-cjson, attackers could exploit this flaw to inject malicious scripts, potentially compromising user data and security.
Yes, the patched version of python-cjson is 1.0.5-4build1, which addresses the vulnerability.
If an immediate update is not possible, consider implementing input validation and sanitization to reduce the risk of XSS attacks.
You can use Vulert, which monitors and alerts for open-source vulnerabilities in real-time. You can check your application against this vulnerability using the Vulert playground without any signup.
References
Related vulnerabilities
Recent vulnerabilities recorded for python-cjson.
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