Vulnerability Description
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.
References:
https://www.mail-archive.com/announce@apache.org/msg05620.html
Scope of Impact
Affected Version
- Apache Log4j <= 1.2.17
Official support for Apache Log4j 1.X was no longer available in August 2015.
Unaffected Version
- Apache Log4j> = 2.8.2
Vulnerability Check
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.
Mitigations
- 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
- Workarounds
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.
Statement
This advisory is only used to describe a potential risk. NSFOCUS does not provide any commitment or promise on this advisory. NSFOCUS and the author will not bear any liability for any direct and/or indirect consequences and losses caused by transmitting and/or using this advisory. NSFOCUS reserves all the rights to modify and interpret this advisory. Please include this statement paragraph when reproducing or transferring this advisory. Do not modify this advisory, add/delete any information to/from it, or use this advisory for commercial purposes without permission from NSFOCUS.
About NSFOCUS
NSFOCUS, Inc., a global network and cyber security leader, protects enterprises and carriers from advanced cyber attacks. The company’s Intelligent Hybrid Security strategy utilizes both cloud and on-premises security platforms, built on a foundation of real-time global threat intelligence, to provide multi-layered, unified and dynamic protection against advanced cyber attacks.
NSFOCUS works with Fortune Global 500 companies, including four of the world’s five largest financial institutions, organizations in insurance, retail, healthcare, critical infrastructure industries as well as government agencies. NSFOCUS has technology and channel partners in more than 60 countries, is a member of both the Microsoft Active Protections Program (MAPP), and the Cloud Security Alliance (CSA).
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