Critical Remote Code Execution Vulnerability in libxstream-java
Summary
UBUNTU-CVE-2020-26217: XStream before version 1.4.14 is vulnerable to Remote Code Execution.The vulnerability may allow a remote attacker to run arbitrary shell commands only by manipulating the processed input stream. Affects libxstream-java versions < 1.4.7-1ubuntu0.1+esm2. Fixed in 1.4.7-1ubuntu0.1+esm2. How to fix ↓
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Background
libxstream-java is a Java library that facilitates the serialization and deserialization of Java objects to and from XML. It is widely used in applications that require data interchange in a human-readable format. The library's flexibility and ease of use make it a popular choice among developers. However, it has been found to have a critical vulnerability that exposes applications to potential remote code execution attacks.
Vulnerability Detail
XStream before version 1.4.14 is vulnerable to Remote Code Execution. This vulnerability allows a remote attacker to execute arbitrary shell commands by manipulating the input stream processed by the library. The issue primarily affects users who rely on blocklists for security, as those using XStream's Security Framework allowlist are not impacted. The vulnerability is classified with a CVSS score of 8.8, indicating a high severity level, and could lead to significant security breaches if exploited.
How To Fix
Minimum fixed version
1.4.7-1ubuntu0.1+esm2
This is the first release that contains the fix.
sudo apt-get install --only-upgrade libxstream-javaTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
If upgrading is not immediately possible, users can implement code workarounds as suggested in the advisory linked in the vulnerability details. These workarounds typically involve modifying the way input streams are processed to mitigate the risk of remote code execution.
Conclusion
The libxstream-java library has a critical vulnerability that allows for remote code execution. It is crucial for users to update to the patched versions of the library to safeguard their applications. Workarounds are available for those unable to upgrade immediately, but the best course of action is to apply the updates as soon as possible.
See every vulnerability recorded for libxstream-java →
FAQ
The CVSS score of this vulnerability is 8.8, indicating a high severity level.
Versions of libxstream-java prior to 1.4.14 are affected by this vulnerability.
If your application is vulnerable, a remote attacker could execute arbitrary shell commands, potentially compromising your system.
You can use Vulert, which monitors and alerts for open-source vulnerabilities in your software. You can check your application using the Vulert playground without any signup.
Yes, implementing code workarounds as suggested in the advisory can help mitigate the risk until an upgrade is possible.
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