CVE_2021_44228 - Handling the log4j lookups critical vulnerability for Qlik Compose for Data Lakes

[Jamie_Gregory]

Qlik is providing these mitigation steps as a temporary measure. A patch will be provided and linked here; customers are advised to move to the patch as soon as it is available.

Environment:

• Qlik Compose for Data Lakes 

Mitigation steps to follow Compose for Data Lakes log4j vulnerability:

Mitigation - Windows Service

1.  Edit the file <installation-root>\Compose for Data Lakes\java\bin\acjs.bat (<installation-root> typically refers to C:\Program Files\Attunity)
2.  Add the command set LOG4J_FORMAT_MSG_NO_LOOKUPS=TRUE  in the location shown below (script line before last):
   
   

   REM Attunity Compose Java Server configuration/run script
   REM e.g. AT_PROD = C:\Program Files\Attunity\Compose\java_server
   for %%A in ("%~dp0..") do set AT_PROD=%%~fA
   REM list plugins here
   SET AT_PLUGIN_LIST=-plugins compose_ctl
   REM set data directory based on the name of this script
   set AT_DATA_SUFFIX=
   for /F "tokens=2 delims=_" %%A in ("%~n0") do set AT_DATA_SUFFIX=%%A
   if "%AT_DATA_SUFFIX%" == "" (
           set AT_DATA=
   ) else (
           set AT_DATA=-d data_%AT_DATA_SUFFIX%
   )
   if "%COMPOSE_JAVA_SERVER_DEBUG%" == "true" (
           set  JVM_REMOTE_DEBUG_ARGUMENTS=-agentlib:jdwp=transport=dt_socket,server=y,suspend=n,address=127.0.0.1:5005
   )else (
           set JVM_REMOTE_DEBUG_ARGUMENTS=
   )
   SET AT_JAVA=%AT_PROD%\lib\jre\bin\java.exe
   SET AT_EXTERNAL=%AT_PROD%\external
   SET AT_LIB=%AT_PROD%\lib
   SET AT_PLUGINS=%AT_PROD%\plugins
   SET AT_MAIN=com.attunity.infrastructure.server.PluginServer
   SET AT_EXTERNAL_JDBC_PATH=%AT_PROD%\jdbc
   SET AT_APP_NAME=-DQlikApp=ComposeJavaServer
   
   <--------------------- Fix Here--------------------->
   SET LOG4J_FORMAT_MSG_NO_LOOKUPS=TRUE
   "%AT_JAVA%" %AT_APP_NAME% %JVM_REMOTE_DEBUG_ARGUMENTS% -cp "%AT_EXTERNAL_JDBC_PATH%"/*;"%AT_PLUGINS%"/*;"%AT_EXTERNAL%"/*;"%AT_LIB%"/* %AT_MAIN% %AT_DATA% %AT_PLUGIN_LIST% %*

3. Save the file.
4. Locate the vulnerable log4j-core-<version#>.jar file and rename it to log4j-core-<version#>.jar-vulnerable.
   

   $ cd <installation-root>\Compose\java\external
   
   $ ren log4j-core-<version#>.jar  ..\log4j-core-<version#>.jar-vulnerable

5. Download the non-vulnerable jar named log4j-core-nolookup-<version#>.jar  from this page and place it in the same location as the vulnerable jar.
6. Restart the Compose for Data Lakes Windows service.
   
   

   $ sc stop AttunityComposeForDataLakes
   
   $ sc start AttunityComposeForDataLakes

Note that if you have a customized Compose for Data Lakes start script, you should perform the equivalent edit on your modified start script.

Mitigation – Remote Compose Agent on Hadoop

Customers using Compose for Data Lakes using Spark projects with a remote Compose agent running on their Hadoop cluster should follow the mitigation for the Windows service, as detailed above. Additionally, they will need to apply another mitigation for the remote Compose agent running on Hadoop. The certification and the details for this mitigation are not yet ready and will be published in the coming days. Monitor the support blog or knowledge base in the Qlik community for an updated version of this document.

For more information on the Log4j vulnerability, please visit the Support Updates Blog post.