I’ve moved further discussion of this issue to security@nifi.apache.org

Andy LoPresto
PGP Fingerprint: 70EC B3E5 98A6 5A3F D3C4  BACE 3C6E F65B 2F7D EF69

On Mar 23, 2017, at 10:26 AM, Ke Yang (Conan) <ke.yang1@huawei.com> wrote:

  We use NiFi which embeds Jetty Server. Our test team found a security bug by intercepting the http request and replacing the header with a huge (say 1GB) text, which sent the response to NCM, which got OOM:
2017-03-07 03:44:03,522 WARN [NiFi Web Server-22] o.a.n.c.m.impl.HttpRequestReplicatorImpl Node request for [id=99a65e79-b856-4e43-9056-1451714498fc, apiAddress=, apiPort=38484, socketAddress=, socketPort=39494, siteToSiteAddress=, siteToSitePort=null] encountered exception: java.util.concurrent.ExecutionException: java.lang.OutOfMemoryError: Java heap space
 We tried setResponseHeaderSize here http://download.eclipse.org/jetty/stable-9/apidocs/org/eclipse/jetty/server/HttpConfiguration.html#setResponseHeaderSize-int- but it didn't seem to work: it seems to us that the huge fake header got received before this limit takes effect, as a result, the NCM got OOM in the first place.
Are we missing anything, or is there a potential bug with setResponseHeaderSize, please?
Btw, we also wonder if below workaround would work?
1.      Increase Nifi bootstrap.conf JVM heap size such as xmx8g

nifi.cluster.manager.node.api.connection.timeout=30 sec

nifi.cluster.manager.node.api.read.timeout=30 sec