Critical Format String Vulnerability in Ruby Package
Summary
ALPINE-CVE-2017-0898: Ruby before 2.4.2, 2.3.5, and 2.2.8 is vulnerable to a malicious format string which contains a precious specifier (*) with a huge minus value. Affects ruby versions < 2.4.2-r0. Fixed in 2.4.2-r0. How to fix ↓
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Background
Ruby is a dynamic, open-source programming language with a focus on simplicity and productivity. It is widely used for web development, particularly in conjunction with the Ruby on Rails framework. The Ruby package in Alpine Linux is essential for running Ruby applications. However, certain versions of Ruby are vulnerable to a format string attack, which can lead to severe security issues.
Vulnerability Detail
The vulnerability identified as CVE-2017-0898 affects Ruby versions prior to 2.4.2, 2.3.5, and 2.2.8. It arises from a malicious format string that includes a precious specifier (*) with a significant negative value. This can result in a buffer overrun, leading to heap memory corruption or potential information disclosure from the heap. The CVSS score for this vulnerability is 9.1, indicating a critical level of risk.
How To Fix
Minimum fixed version
2.4.2-r0
This is the first release that contains the fix.
sudo apk add --upgrade rubyTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
If an immediate update is not feasible, consider restricting access to the affected Ruby applications or implementing strict input validation to mitigate the risk of exploitation.
Conclusion
The CVE-2017-0898 vulnerability poses a significant risk to Ruby applications running on Alpine Linux. It is crucial to update to the patched versions to mitigate potential security threats. Users should also consider using tools like Vulert to monitor for vulnerabilities in their software.
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FAQ
CVE-2017-0898 is a critical vulnerability in Ruby that allows for a format string attack, potentially leading to memory corruption or information disclosure.
Ruby versions prior to 2.4.2, 2.3.5, and 2.2.8 are affected by this vulnerability.
You can use the Vulert platform to check if your application is affected by this vulnerability by analyzing your manifest file without requiring any installation.
If an immediate update is not possible, consider implementing strict input validation and restricting access to the affected applications as a temporary measure.
The CVSS score for CVE-2017-0898 is 9.1, indicating a critical level of risk associated with this vulnerability.
References
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