On December 19 local time, Apache Software Foundation (ASF) officially released a security advisory, announcing that Apache Log4j has a deserialization issue that could cause remote code execution (CVE-2019-17571). Log4j is a Java-based open-source logging tool from the Apache Software Foundation. Log4j 1.2 includes a SocketServer class which can easily accept serialized log events and deserialize them without authentication. With the aid of deserialization tools, an attacker could use this class to remotely execute arbitrary code.
Scope of Impact
- Apache Log4j <= 1.2.17
Official support for Apache Log4j 1.X was no longer available in August 2015.
- Apache Log4j> = 2.8.2
Users can determine whether the current application is vulnerable by checking the version.
Check the Apache Log4j version indicated in the pom.xml file:
If the current version is within the affected scope, there may be security risks.
- Official Upgrade
Currently, this vulnerability has been fixed in Apache Log4j 2.8.2. Affected users are advised to update to 2.8.2 or later for protection.
Download link: https://logging.apache.org/log4j/2.x/download.html
If users cannot upgrade to V2.8.2 or later for the time being, they can also prevent the socket port enabled by the SocketServer class in Log4j from being opened to the public network.
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