prometheus-jmx-exporter/SOURCES/0001-Fix-CVE-2017-18640-and-add-a-test.patch

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From 8cbe3bee31e605d535783431bfb74c3e2867ee37 Mon Sep 17 00:00:00 2001
From: Severin Gehwolf <sgehwolf@redhat.com>
Date: Wed, 15 Apr 2020 17:41:17 +0200
Subject: [PATCH] Fix CVE-2017-18640 and add a test
---
collector/pom.xml | 2 +-
.../java/io/prometheus/jmx/JmxCollector.java | 12 ++++++++-
.../io/prometheus/jmx/JmxCollectorTest.java | 26 ++++++++++++++++---
collector/src/test/resources/testyaml.config | 9 +++++++
4 files changed, 44 insertions(+), 5 deletions(-)
create mode 100644 collector/src/test/resources/testyaml.config
diff --git a/collector/pom.xml b/collector/pom.xml
index 8e90d58..b58d94a 100644
--- a/collector/pom.xml
+++ b/collector/pom.xml
@@ -29,7 +29,7 @@
<dependency>
<groupId>org.yaml</groupId>
<artifactId>snakeyaml</artifactId>
- <version>1.16</version>
+ <version>1.26</version>
</dependency>
</dependencies>
diff --git a/collector/src/main/java/io/prometheus/jmx/JmxCollector.java b/collector/src/main/java/io/prometheus/jmx/JmxCollector.java
index f06d3ef..a5fc96f 100644
--- a/collector/src/main/java/io/prometheus/jmx/JmxCollector.java
+++ b/collector/src/main/java/io/prometheus/jmx/JmxCollector.java
@@ -3,6 +3,7 @@ package io.prometheus.jmx;
import io.prometheus.client.Collector;
import io.prometheus.client.Counter;
import org.yaml.snakeyaml.Yaml;
+import org.yaml.snakeyaml.error.YAMLException;
import javax.management.MalformedObjectNameException;
import javax.management.ObjectName;
@@ -71,7 +72,16 @@ public class JmxCollector extends Collector implements Collector.Describable {
public JmxCollector(File in) throws IOException, MalformedObjectNameException {
configFile = in;
- config = loadConfig((Map<String, Object>)new Yaml().load(new FileReader(in)));
+ // Be defensive about loading yaml from a user. In some cases YAMLException
+ // will be thrown for bad configs
+ Map<String, Object> yamlConfig = null;
+ try {
+ yamlConfig = (Map<String, Object>)new Yaml().load(new FileReader(in));
+ } catch (YAMLException e) {
+ System.err.println("YAML configuration error: " + e.getMessage());
+ throw new IllegalArgumentException(e);
+ }
+ config = loadConfig(yamlConfig);
config.lastUpdate = configFile.lastModified();
}
diff --git a/collector/src/test/java/io/prometheus/jmx/JmxCollectorTest.java b/collector/src/test/java/io/prometheus/jmx/JmxCollectorTest.java
index dc35734..3d4ecf0 100644
--- a/collector/src/test/java/io/prometheus/jmx/JmxCollectorTest.java
+++ b/collector/src/test/java/io/prometheus/jmx/JmxCollectorTest.java
@@ -3,15 +3,21 @@ package io.prometheus.jmx;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.assertNull;
+import static org.junit.Assert.assertTrue;
import static org.junit.Assert.fail;
-import io.prometheus.client.Collector;
-import io.prometheus.client.CollectorRegistry;
+import java.io.File;
import java.lang.management.ManagementFactory;
+
import javax.management.MBeanServer;
-import org.junit.Test;
+
import org.junit.Before;
import org.junit.BeforeClass;
+import org.junit.Test;
+import org.yaml.snakeyaml.error.YAMLException;
+
+import io.prometheus.client.Collector;
+import io.prometheus.client.CollectorRegistry;
public class JmxCollectorTest {
@@ -252,4 +258,18 @@ public class JmxCollectorTest {
Thread.sleep(2000);
assertEquals(1.0, registry.getSampleValue("boolean_Test_True", new String[]{}, new String[]{}), .001);
}
+
+ @Test
+ public void testBillionLaughs() throws Exception {
+ File configFile = new File(getClass().getResource("/testyaml.config").getPath());
+ assertTrue(configFile.exists());
+ try {
+ JmxCollector jc = new JmxCollector(configFile);
+ fail("Excected yaml exception due to billion laughs");
+ } catch (IllegalArgumentException e) {
+ Throwable ex = e.getCause();
+ String prefix = YAMLException.class.getName() + ": ";
+ assertEquals(prefix + "Number of aliases for non-scalar nodes exceeds the specified max=50", e.getMessage());
+ }
+ }
}
diff --git a/collector/src/test/resources/testyaml.config b/collector/src/test/resources/testyaml.config
new file mode 100644
index 0000000..4a3ed69
--- /dev/null
+++ b/collector/src/test/resources/testyaml.config
@@ -0,0 +1,9 @@
+a: &a ["lol","lol","lol","lol","lol","lol","lol","lol","lol"]
+b: &b [*a,*a,*a,*a,*a,*a,*a,*a,*a]
+c: &c [*b,*b,*b,*b,*b,*b,*b,*b,*b]
+d: &d [*c,*c,*c,*c,*c,*c,*c,*c,*c]
+e: &e [*d,*d,*d,*d,*d,*d,*d,*d,*d]
+f: &f [*e,*e,*e,*e,*e,*e,*e,*e,*e]
+g: &g [*f,*f,*f,*f,*f,*f,*f,*f,*f]
+h: &h [*g,*g,*g,*g,*g,*g,*g,*g,*g]
+i: &i [*h,*h,*h,*h,*h,*h,*h,*h,*h]
\ No newline at end of file
--
2.21.1