Critical Buffer Overflow Vulnerability in vim Package
Summary
ALPINE-CVE-2017-5953: vim before patch 8.0.0322 does not properly validate values for tree length when handling a spell file, which may result in an integer overflow at a memory allocation site and a resultant buffer overflow. Affects vim versions < 8.0.0329-r0. Fixed in 8.0.0329-r0. How to fix ↓
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Background
Vim is a highly configurable text editor built to enable efficient text editing. It is widely used by developers and system administrators for its powerful features, including syntax highlighting, multi-level undo, and extensive plugin support. However, certain versions of vim are vulnerable to a critical buffer overflow due to improper validation of tree length values when handling spell files, which can lead to severe security risks.
Vulnerability Detail
The vulnerability identified as CVE-2017-5953 affects vim versions prior to patch 8.0.0322. It arises from a failure to properly validate values for tree length when processing spell files. This oversight can result in an integer overflow at a memory allocation site, potentially leading to a buffer overflow. Such vulnerabilities can be exploited by attackers to execute arbitrary code, compromise system integrity, or cause application crashes.
How To Fix
Minimum fixed version
8.0.0329-r0
This is the first release that contains the fix.
sudo apk add --upgrade vimTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
As a temporary workaround, users can avoid opening spell files until the package is updated to a secure version. Additionally, disabling spell checking in vim can mitigate the risk until the patch is applied.
Conclusion
The CVE-2017-5953 vulnerability in vim poses a significant risk due to its potential for buffer overflow and arbitrary code execution. Users are strongly advised to update to the patched version 8.0.0329-r0 or later to mitigate this risk. Regular monitoring for vulnerabilities using tools like Vulert can help maintain the security of your applications.
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FAQ
CVE-2017-5953 is a critical vulnerability in the vim text editor that can lead to buffer overflow due to improper validation of tree length values in spell files.
You can check your version of vim by running vim --version in your terminal. If it is below 8.0.0322, it is vulnerable.
Exploitation of this vulnerability can lead to arbitrary code execution, system crashes, or unauthorized access to sensitive data.
Yes, you can use Vulert, which monitors and alerts in real-time for open-source vulnerabilities using just a manifest file like package-lock.json.
You can use the Vulert playground at Vulert Scanner to check if your application is affected by this vulnerability without needing to sign up.
References
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