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https://issues.apache.org/jira/browse/LOG4J2-1863?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16217905#comment-16217905
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Ralph Goers commented on LOG4J2-1863:
-------------------------------------
Please note that the Log4j team strongly recommends against using the
SerializedLayout with the SocketAppenders. The SocketAppender can be configured
with the JsonLayout to accomplish the same thing in a way that does not expose
the server to the serialization issues.
The Log4j socket servers were meant to be examples for users and as such have
been moved from log4j core into its own Git repository where it will be
separately maintained and released. There are no plans to drop support for the
SocketServers.
> Add support for filtering input in TcpSocketServer and UdpSocketServer
> ----------------------------------------------------------------------
>
> Key: LOG4J2-1863
> URL: https://issues.apache.org/jira/browse/LOG4J2-1863
> Project: Log4j 2
> Issue Type: New Feature
> Components: Receivers
> Affects Versions: 2.8.1
> Reporter: Matt Sicker
> Assignee: Matt Sicker
> Fix For: 2.8.2
>
>
> It is best practice to add a configurable class filter to ObjectInputStream
> usage when input comes from untrusted sources. Add this feature to
> TcpSocketServer and UdpSocketServer along with sensible default settings.
> This feature is unnecessary in JmsServer as that relies on the underlying
> configuration of the JMS server (e.g., ActiveMQ has a similar configuration
> option).
> h3. Security Details
> {code}
> CVE-2017-5645: Apache Log4j socket receiver deserialization vulnerability
> Severity: High
> CVSS Base Score: 7.5 (AV:N/AC:L/Au:N/C:P/I:P/A:P)
> Vendor: The Apache Software Foundation
> Versions Affected: all versions from 2.0-alpha1 to 2.8.1
> Description: When using the TCP socket server or UDP socket server to receive
> serialized log events from another application, a specially crafted binary
> payload can be sent that, when deserialized, can execute arbitrary code.
> Mitigation: Java 7+ users should migrate to version 2.8.2 or avoid using the
> socket server classes. Java 6 users should avoid using the TCP or UDP socket
> server classes, or they can manually backport the security fix from 2.8.2:
> <https://git-wip-us.apache.org/repos/asf?p=logging-log4j2.git;h=5dcc192>
> Credit: This issue was discovered by Marcio Almeida de Macedo of Red Team at
> Telstra
> {code}
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