Critical Buffer Overflow in ncurses Package Leading to Potential Code Execution
Summary
ALPINE-CVE-2017-16879: Stack-based buffer overflow in the _nc_write_entry function in tinfo/write_entry.c in ncurses 6.0 allows attackers to cause a denial of service (application crash) or possibly execute arbitrary code via a crafted terminf... Affects ncurses versions < 6.0_p20171125-r0. Fixed in 6.0_p20171125-r0. How to fix ↓
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Background
The ncurses package is a widely used library in Unix-like systems that provides functions to create text-based user interfaces in a terminal. It allows developers to manage multiple windows, handle keyboard input, and manipulate text display. However, a vulnerability has been identified in ncurses that could lead to severe security risks, including application crashes and arbitrary code execution.
Vulnerability Detail
The vulnerability, identified as CVE-2017-16879, is a stack-based buffer overflow in the _nc_write_entry function located in tinfo/write_entry.c of the ncurses library version 6.0. This flaw allows attackers to exploit crafted terminfo files, potentially leading to denial of service or execution of arbitrary code. The vulnerability has a CVSS score of 7.8, indicating a high severity level, and poses significant risks to systems utilizing this library.
How To Fix
Minimum fixed version
6.0_p20171125-r0
This is the first release that contains the fix.
sudo apk add --upgrade ncursesTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
As a temporary workaround, avoid using untrusted terminfo files and restrict access to the application to trusted users only. Additionally, consider running the application in a secure environment to mitigate risks.
Conclusion
The vulnerability in the ncurses package poses significant risks, including potential code execution and application crashes. It is crucial to update to the patched version to mitigate these risks. Utilizing tools like Vulert can help monitor for such vulnerabilities in real-time.
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FAQ
CVE-2017-16879 is a vulnerability in the ncurses package that allows for a stack-based buffer overflow, which can lead to application crashes or arbitrary code execution.
You can use Vulert, which monitors and alerts for open-source vulnerabilities in your software. Visit Vulert Scanner to check if your application is affected without requiring any signup.
The CVSS score for CVE-2017-16879 is 7.8, indicating a high severity level.
If an immediate update is not possible, restrict access to the application and avoid using untrusted terminfo files as a temporary measure.
You can find more information about the ncurses library and its functionalities on its official documentation or repository.
References
Related vulnerabilities
Recent vulnerabilities recorded for ncurses.
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