In Apache Spark. How to set worker/executor's environment variables?

My spark program on EMR is constantly getting this error:

Caused by: javax.net.ssl.SSLPeerUnverifiedException: peer not authenticated
    at sun.security.ssl.SSLSessionImpl.getPeerCertificates(SSLSessionImpl.java:421)
    at org.apache.http.conn.ssl.AbstractVerifier.verify(AbstractVerifier.java:128)
    at org.apache.http.conn.ssl.SSLSocketFactory.connectSocket(SSLSocketFactory.java:397)
    at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:148)
    at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:149)
    at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:121)
    at org.apache.http.impl.client.DefaultRequestDirector.tryConnect(DefaultRequestDirector.java:573)
    at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:425)
    at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:820)
    at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:754)
    at org.jets3t.service.impl.rest.httpclient.RestStorageService.performRequest(RestStorageService.java:334)
    at org.jets3t.service.impl.rest.httpclient.RestStorageService.performRequest(RestStorageService.java:281)
    at org.jets3t.service.impl.rest.httpclient.RestStorageService.performRestHead(RestStorageService.java:942)
    at org.jets3t.service.impl.rest.httpclient.RestStorageService.getObjectImpl(RestStorageService.java:2148)
    at org.jets3t.service.impl.rest.httpclient.RestStorageService.getObjectDetailsImpl(RestStorageService.java:2075)
    at org.jets3t.service.StorageService.getObjectDetails(StorageService.java:1093)
    at org.jets3t.service.StorageService.getObjectDetails(StorageService.java:548)
    at org.apache.hadoop.fs.s3native.Jets3tNativeFileSystemStore.retrieveMetadata(Jets3tNativeFileSystemStore.java:172)
    at sun.reflect.GeneratedMethodAccessor18.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:190)
    at org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:103)
    at org.apache.hadoop.fs.s3native.$Proxy8.retrieveMetadata(Unknown Source)
    at org.apache.hadoop.fs.s3native.NativeS3FileSystem.getFileStatus(NativeS3FileSystem.java:414)
    at org.apache.hadoop.fs.FileSystem.exists(FileSystem.java:1398)
    at org.apache.hadoop.fs.s3native.NativeS3FileSystem.create(NativeS3FileSystem.java:341)
    at org.apache.hadoop.fs.FileSystem.create(FileSystem.java:906)
    at org.apache.hadoop.fs.FileSystem.create(FileSystem.java:887)
    at org.apache.hadoop.fs.FileSystem.create(FileSystem.java:784)

I did some research and found out that this authentication can be disabled in low-security situation, by setting environment variable:

com.amazonaws.sdk.disableCertChecking=true

but I can only set it with spark-submit.sh --conf, which only affects driver, while most of the errors are on workers.

Is there a way to propagate them to workers?

Thanks a lot.