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https://issues.apache.org/jira/browse/LOG4J2-1863?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Matt Sicker closed LOG4J2-1863.
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> 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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