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From b1c0ca75ca38a7a8b50bfdfdf2c324169a6ddf02 Mon Sep 17 00:00:00 2001
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From: Michael Simacek <msimacek@redhat.com>
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Date: Mon, 19 Mar 2018 16:01:57 +0100
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Subject: [PATCH] Disallow EventData deserialization by default
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---
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.../src/main/java/org/slf4j/ext/EventData.java | 21 +++++++++++++++------
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1 file changed, 15 insertions(+), 6 deletions(-)
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diff --git a/slf4j-ext/src/main/java/org/slf4j/ext/EventData.java b/slf4j-ext/src/main/java/org/slf4j/ext/EventData.java
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index dc5b502..fa5c125 100644
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--- a/slf4j-ext/src/main/java/org/slf4j/ext/EventData.java
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+++ b/slf4j-ext/src/main/java/org/slf4j/ext/EventData.java
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@@ -76,12 +76,21 @@ public class EventData implements Serializable {
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*/
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@SuppressWarnings("unchecked")
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public EventData(String xml) {
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- ByteArrayInputStream bais = new ByteArrayInputStream(xml.getBytes());
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- try {
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- XMLDecoder decoder = new XMLDecoder(bais);
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- this.eventData = (Map<String, Object>) decoder.readObject();
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- } catch (Exception e) {
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- throw new EventException("Error decoding " + xml, e);
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+ if ("1".equals(System.getProperty("org.slf4j.ext.allowInsecureDeserialization"))) {
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+ ByteArrayInputStream bais = new ByteArrayInputStream(xml.getBytes());
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+ try {
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+ XMLDecoder decoder = new XMLDecoder(bais);
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+ this.eventData = (Map<String, Object>) decoder.readObject();
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+ } catch (Exception e) {
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+ throw new EventException("Error decoding " + xml, e);
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+ }
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+ } else {
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+ throw new UnsupportedOperationException(
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+ "Constructing EventData from XML is vulnerable to remote " +
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+ "excution and is not allowed by default. If you're " +
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+ "completely sure the source data is trusted, you can enable " +
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+ "it by setting org.slf4j.ext.allowInsecureDeserialization " +
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+ "JVM property to 1");
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}
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}
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--
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2.14.3
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