Local File Overwrite Vulnerability in Syncevolution Package
Summary
DEBIAN-CVE-2014-1639: syncevo/installcheck-local.sh in syncevolution before 1.3.99.7 uses mktemp to create a safe temporary file but appends a suffix to the original filename and writes to this new filename, which allows local users to overwr... Affects syncevolution versions < 1.3.99.7-1. Fixed in 1.3.99.7-1. How to fix ↓
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Background
Syncevolution is an open-source synchronization framework that allows users to synchronize data across various devices and platforms. It provides a flexible architecture for managing synchronization tasks and supports multiple data sources. However, prior to version 1.3.99.7, Syncevolution contained a vulnerability in its installation script that could lead to local file overwriting, posing a risk to system integrity.
Vulnerability Detail
The vulnerability arises from the use of the mktemp command in the syncevo/installcheck-local.sh script, which is intended to create a safe temporary file. However, the script appends a suffix to the original filename and writes to this new filename. This design flaw allows local users to exploit a symlink attack, potentially overwriting arbitrary files on the system. The ramifications of this vulnerability can lead to unauthorized data manipulation or system compromise, making it critical for users to address it promptly.
How To Fix
Minimum fixed version
1.3.99.7-1
This is the first release that contains the fix.
sudo apt-get install --only-upgrade syncevolutionTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
As a temporary workaround, users can avoid executing the vulnerable script or restrict access to the script to prevent unauthorized users from exploiting the symlink attack. Additionally, users can manually check for symlinks in the temporary file directory to mitigate the risk.
Conclusion
The local file overwrite vulnerability in the Syncevolution package poses significant risks to users, particularly those running versions prior to 1.3.99.7. It is crucial to update to the patched version to mitigate these risks and ensure system integrity. Users are also encouraged to explore tools like Vulert for ongoing vulnerability monitoring.
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FAQ
The vulnerability allows local users to overwrite arbitrary files through a symlink attack due to improper handling of temporary files in the installation script.
You can check your version of Syncevolution by running 'syncevolution --version' in the terminal. If it is below 1.3.99.7, it is affected.
The risks include unauthorized data manipulation, system instability, and potential compromise of sensitive information.
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 any signup.
References
Related vulnerabilities
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