Use-After-Free Vulnerability in Python 3.9 via heapq's heappushpop
Summary
CVE-2022-48560: A use-after-free exists in Python through 3.9 via heappushpop in heapq. Affects python2.7 across 2 version ranges.
< 2.7.18-8+deb11u1
< d56cd4006a1c5e07b0bf69fad9fc8e2fbf6aa855
Fixed in 2.7.18-8+deb11u1. How to fix ↓
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Background
Python is a widely-used high-level programming language known for its readability and versatility. It supports multiple programming paradigms and is extensively used in web development, data analysis, artificial intelligence, and more. The vulnerability in question affects Python 3.9 through the heapq module's heappushpop function, which can lead to memory management issues.
Vulnerability Detail
A use-after-free vulnerability exists in Python 3.9, specifically in the heapq module's heappushpop function. This flaw arises when the function attempts to access memory that has already been freed, potentially leading to arbitrary code execution or application crashes. The vulnerability can be exploited by attackers to manipulate memory, which may result in data corruption or unauthorized access to sensitive information.
How To Fix
Minimum fixed version
2.7.18-8+deb11u1
This is the first release that contains the fix.
sudo apt-get install --only-upgrade python2.7Tip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
As a temporary workaround, avoid using the heappushpop function in the heapq module until the vulnerability is patched. Consider using alternative methods for heap operations that do not involve this function.
Conclusion
The use-after-free vulnerability in Python 3.9's heapq module poses significant risks, including potential memory corruption and unauthorized access. Users are advised to upgrade their Python installations to mitigate these risks and ensure the security of their applications.
See every vulnerability recorded for python2.7 →
FAQ
A use-after-free vulnerability occurs when a program continues to use a memory location after it has been freed, leading to potential memory corruption or exploitation.
You can use Vulert's playground at Vulert Scanner to check if your application is affected by this vulnerability without needing to sign up.
Exploitation of this vulnerability can lead to application crashes, arbitrary code execution, or unauthorized access to sensitive data.
Yes, upgrading to a version of Python that has addressed this vulnerability is essential. Ensure you are using a version later than the fixed releases.
The CVSS score for this vulnerability is 7.5, indicating a high severity level.
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