Log4j Disable Literal Pattern Converter #46
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cliveverghese
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cliveverghese
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lutkerd
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Dec 23, 2021
| echo "Running Literal Pattern Converter JDK${JVM_MV} Test" | ||
| echo "------------------" | ||
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| start_dos_test ${JDK_DIR} ${AGENT_JAR} |
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You need to capture the pid of the process and kill it later.
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| public static boolean isEnabled(String args) { | ||
| String param = "--enable-" + NAME; | ||
| return args != null && args.contains(param); | ||
| } |
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I don't think isEnabled is in the current implementation
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| @Override | ||
| public int getVersion() { | ||
| return 2; |
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Is the version for the patchset, if so this is version 1 of Log4j2PatchSetWithDisableLookups.
| local agent_jar=$2 | ||
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| pushd "${ROOT_DIR}/test" > /dev/null | ||
| ${jdk_dir}/bin/java -cp log4j-core-2.12.1.jar:log4j-api-2.12.1.jar:. -Dlog4j2.configurationFile=${ROOT_DIR}/src/test/resources/log4j-vuln2.properties -javaagent:${agent_jar}=patcherClassName=com.amazon.corretto.hotpatch.patch.impl.set.Log4j2PatchSetWithDisableLookups Vuln2 > /tmp/vuln2.log & |
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Can you hotpatch with this? If so please add tests and doc updates
| restarting the Java process. This tool will also address | ||
| [CVE-2021-45046](https://nvd.nist.gov/vuln/detail/CVE-2021-45046/). | ||
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| To Patch for [CVE-2021-45105](https://nvd.nist.gov/vuln/detail/CVE-2021-45105), you can run the tool with the following |
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Please expand on when/why some one would need to patch for this and what the side effects of it are.
| @@ -46,6 +46,19 @@ function start_static_target() { | |||
| popd > /dev/null | |||
| } | |||
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| function start_dos_test() { | |||
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Can you add a test that verifies by default the dos patcher is not active?
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Although
-DformatMsgNoLookups=trueprevents lookups directly in the message, Format Lookups are possible when reading a property from the ThreadContext/MDC in the pattern for the message. On certain scenarios, this can cause a StackOverflow through recursive lookups as described on CVE-2021-45105.This patch disables lookups in Message Pattern by patching LiteralPatternConverter.
The patch for LiteralPatternConverter is not enabled by default and can be enabled using the following parameters