Critical Array Index Error in Python Package Leading to Memory Exposure
Summary
ALPINE-CVE-2014-4616: Array index error in the scanstring function in the _json module in Python 2.7 through 3.5 and simplejson before 2.6.1 allows context-dependent attackers to read arbitrary process memory via a negative index value in the... Affects python versions < 2.7.7-r0. Fixed in 2.7.7-r0. How to fix ↓
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Background
The Python package is a widely-used programming language that supports multiple programming paradigms, including procedural, object-oriented, and functional programming. It is known for its simplicity and readability, making it a popular choice among developers. However, versions of Python from 2.7 through 3.5, as well as the simplejson library before version 2.6.1, are vulnerable to a critical issue that allows attackers to exploit an array index error in the _json module.
Vulnerability Detail
The vulnerability stems from an array index error in the scanstring function within the _json module of Python. This issue allows context-dependent attackers to read arbitrary process memory by providing a negative index value in the idx argument to the raw_decode function. The potential ramifications include unauthorized access to sensitive information stored in memory, which could lead to further exploitation or data breaches.
How To Fix
Minimum fixed version
2.7.7-r0
This is the first release that contains the fix.
sudo apk add --upgrade pythonTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
As a temporary workaround, avoid using the vulnerable versions of Python and consider using a different JSON parsing library that does not exhibit this vulnerability until an update can be applied.
Conclusion
In summary, the array index error in the Python package poses a significant risk by allowing attackers to read arbitrary memory. It is crucial for users to update to the patched version to mitigate this vulnerability and protect sensitive data.
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FAQ
The CVSS score of this vulnerability is 5.9, indicating a medium severity level.
The vulnerability affects Python versions from 2.7 through 3.5 and simplejson versions before 2.6.1.
You can use Vulert, which monitors and alerts for open-source vulnerabilities in real-time. You can check your application using the Vulert playground without any signup at Vulert Scanner.
The vulnerability can lead to unauthorized access to sensitive information in memory, which may result in data breaches or further exploitation of the system.
Yes, the permanent fix is to update to the patched version of the Python package, specifically version 2.7.7-r0 for Alpine Linux users.
References
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