File Exposure Vulnerability in MechanicalSoup (CVE-2023-34457)
Summary
CVE-2023-34457: MechanicalSoup is a Python library for automating interaction with websites. Affects python-mechanicalsoup across 2 version ranges.
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No fix is published. How to fix ↓
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Background
MechanicalSoup is a Python library designed for automating interactions with websites, allowing users to programmatically fill out forms and navigate web pages. It is widely used for web scraping and testing web applications due to its simplicity and ease of use. However, a critical vulnerability was discovered that allows malicious web servers to exploit file input fields, potentially leading to unauthorized access to sensitive files on the client machine.
Vulnerability Detail
The vulnerability, identified as CVE-2023-34457, affects versions of MechanicalSoup from 0.2.0 up to, but not including, 1.3.0. It arises from the library's handling of HTML form submissions containing <input type="file" ...> elements. When a user interacts with such a form, a malicious web server can read arbitrary files from the user's system, posing a significant security risk. This issue is particularly concerning for users who may not have taken specific manual steps to reset HTML form field values, leaving them vulnerable to exploitation.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a temporary workaround, users can avoid using MechanicalSoup for form submissions that include file input fields until they can upgrade to the patched version. Additionally, users should ensure that they manually reset any HTML form field values before submitting forms to mitigate the risk of file exposure.
Conclusion
The vulnerability CVE-2023-34457 in MechanicalSoup poses a serious risk by allowing unauthorized file access through malicious web forms. Users are strongly advised to upgrade to version 1.3.0 or later to protect against this issue. For those unable to upgrade immediately, implementing workarounds can help mitigate risks until a proper fix is applied.
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FAQ
CVE-2023-34457 is a vulnerability in the MechanicalSoup library that allows malicious web servers to read arbitrary files from a user's system through HTML form submissions.
Versions from 0.2.0 to 1.2.99 are affected. Users should upgrade to version 1.3.0 or later to mitigate the vulnerability.
You can use Vulert, which monitors and alerts for open-source vulnerabilities in your software. Simply upload your manifest file like package-lock.json to check for vulnerabilities.
If an immediate upgrade is not possible, avoid using MechanicalSoup for forms with file inputs and manually reset form fields before submission.
The CVSS score for this vulnerability is 7.5, indicating a high severity level.
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