Arbitrary File Upload via Deserialization in libcommons-fileupload-java
Summary
DSA-2827-1: libcommons-fileupload-java - arbitrary file upload via deserialization. Affects libcommons-fileupload-java versions < 1.2.2-1+deb6u1. Fixed in 1.2.2-1+deb6u1. How to fix ↓
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Background
libcommons-fileupload-java is a package that provides robust and high-performance file upload capability to servlets and web applications. It allows users to easily add file upload functionality to their applications. However, a vulnerability has been discovered in the package that allows remote attackers to upload arbitrary files to the server.
Vulnerability Detail
The vulnerability in libcommons-fileupload-java arises from the incorrect handling of file names with NULL bytes in serialized instances. An attacker can supply a serialized instance of the DiskFileItem class, which will be deserialized on the server. By exploiting this flaw, the attacker can write arbitrary content to any location on the server accessible to the user running the application server process. This can lead to unauthorized access, data leakage, or even remote code execution.
How To Fix
Minimum fixed version
1.2.2-1+deb6u1
This is the first release that contains the fix.
sudo apt-get install --only-upgrade libcommons-fileupload-javaTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
There is no known workaround for this vulnerability. It is essential to apply the recommended fixes by upgrading the libcommons-fileupload-java package.
Conclusion
The vulnerability in libcommons-fileupload-java allows remote attackers to upload arbitrary files to the server, posing a significant security risk. It is crucial to upgrade the libcommons-fileupload-java package to the fixed versions mentioned in the advisory. For further support on vulnerability remediation, you can contact DevNack.com.
See every vulnerability recorded for libcommons-fileupload-java →
FAQ
libcommons-fileupload-java is a package that provides file upload capability to servlets and web applications.
The vulnerability allows remote attackers to upload arbitrary files to the server, potentially leading to unauthorized access, data leakage, or remote code execution.
To fix this vulnerability, upgrade the libcommons-fileupload-java package to the fixed versions mentioned in the 'how_to_fix' section.
No, there is no known workaround for this vulnerability. It is crucial to apply the recommended fixes.
For more information, you can refer to the Debian Security Advisory DSA-2827-1.
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