Path Checking Vulnerability in Ruby Package: ALPINE-CVE-2019-15845
Summary
ALPINE-CVE-2019-15845: Ruby through 2.4.7, 2.5.x through 2.5.6, and 2.6.x through 2.6.4 mishandles path checking within File.fnmatch functions. Affects ruby versions < 2.5.7-r0. Fixed in 2.5.7-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 has an elegant syntax that is natural to read and easy to write. The Ruby package in Alpine Linux is widely used for developing web applications and scripts. However, certain versions of Ruby are vulnerable to a path checking issue that can lead to security risks.
Vulnerability Detail
The vulnerability identified as CVE-2019-15845 affects Ruby versions through 2.4.7, 2.5.x through 2.5.6, and 2.6.x through 2.6.4. It mishandles path checking within the File.fnmatch functions, which can allow attackers to bypass intended restrictions and potentially access unauthorized files. This flaw can lead to data leakage or unauthorized file access, posing a significant security threat.
How To Fix
Minimum fixed version
2.5.7-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
As a temporary workaround, avoid using the affected versions of Ruby until an upgrade can be performed. Additionally, implement strict file access controls to mitigate the risk of unauthorized access.
Conclusion
The CVE-2019-15845 vulnerability in Ruby poses a significant risk due to improper path checking, which can lead to unauthorized file access. It is crucial to update to the patched versions to mitigate this risk and ensure the security of applications using Ruby.
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FAQ
CVE-2019-15845 is a vulnerability in Ruby that affects path checking within File.fnmatch functions, allowing potential unauthorized file access.
Affected versions include Ruby through 2.4.7, 2.5.x through 2.5.6, and 2.6.x through 2.6.4.
You can use the Vulert playground at Vulert Scanner to check if your application is affected by this vulnerability without needing to sign up.
The CVSS score for CVE-2019-15845 is 6.5, indicating a medium severity level.
If an immediate update is not possible, implement strict file access controls and avoid using the affected Ruby versions until an upgrade can be performed.
References
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