Buffer Overflow Vulnerability in Node.js - CVE-2018-12115
Summary
ALPINE-CVE-2018-12115: In all versions of Node.js prior to 6.14.4, 8.11.4 and 10.9.0 when used with UCS-2 encoding (recognized by Node.js under the names 'ucs2', 'ucs-2', 'utf16le' and 'utf-16le'), Buffer#write() can be abused to write outside... Affects nodejs versions < 8.11.4-r0. Fixed in 8.11.4-r0. How to fix ↓
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Background
Node.js is a popular open-source runtime environment that allows developers to execute JavaScript code server-side. It is widely used for building scalable network applications. The Node.js package provides various functionalities, including handling asynchronous events and managing input/output operations. However, certain versions of Node.js are vulnerable to a buffer overflow issue when using UCS-2 encoding, which can lead to potential security risks.
Vulnerability Detail
In all versions of Node.js prior to 6.14.4, 8.11.4, and 10.9.0, when used with UCS-2 encoding (recognized by Node.js under the names 'ucs2', 'ucs-2', 'utf16le', and 'utf-16le'), the Buffer#write() method can be exploited to write outside the bounds of a single Buffer. This miscalculation occurs when writes start from the second-to-last position of a buffer, potentially leading to data corruption or unauthorized access to memory.
How To Fix
Minimum fixed version
8.11.4-r0
This is the first release that contains the fix.
sudo apk add --upgrade nodejsTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
As a temporary workaround, avoid using UCS-2 encoding in your applications. Instead, consider using UTF-8 encoding, which does not exhibit this vulnerability. You can change the encoding in your code as follows:
const buffer = Buffer.from('your string', 'utf8');
Conclusion
The CVE-2018-12115 vulnerability in Node.js poses significant risks due to buffer overflow issues when using UCS-2 encoding. It is crucial for developers to update to the patched versions to ensure the security of their applications. Utilizing tools like Vulert can help in monitoring and managing vulnerabilities effectively.
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FAQ
CVE-2018-12115 is a vulnerability in Node.js that allows for buffer overflow when using UCS-2 encoding, potentially leading to data corruption.
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 lead to data corruption, unauthorized memory access, and potential security breaches in applications using affected Node.js versions.
You can update Node.js by running the command 'npm install nodejs@8.11.4' in your terminal to install the patched version.
Yes, Vulert can monitor and alert you in real-time for open-source vulnerabilities in your software using just a manifest file like package-lock.json.
References
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