Tomcat request hangs in ChunkedInputFilter.parseChunkHeader

Solution Verified - Updated

Environment

  • Red Hat Enterprise Linux (RHEL) 7.x
  • JBoss Enterprise Web Server (EWS) 2.0.x
    • Tomcat 7.0.x

Issue

  • We see requests on Tomcat hung in the ChunkedInputFilter.parseChunkHeader method:
"http-bio-8080-exec-4" daemon prio=10 tid=0x00007f1258013800 nid=0x7be8 runnable [0x00007f12508aa000]
   java.lang.Thread.State: RUNNABLE
	at org.apache.coyote.http11.filters.ChunkedInputFilter.parseChunkHeader(ChunkedInputFilter.java:354)
	at org.apache.coyote.http11.filters.ChunkedInputFilter.doRead(ChunkedInputFilter.java:171)
	at org.apache.coyote.http11.AbstractInputBuffer.doRead(AbstractInputBuffer.java:346)
	at org.apache.coyote.Request.doRead(Request.java:422)
	at org.apache.catalina.connector.InputBuffer.realReadBytes(InputBuffer.java:290)
	at org.apache.tomcat.util.buf.ByteChunk.substract(ByteChunk.java:449)
	at org.apache.catalina.connector.InputBuffer.read(InputBuffer.java:315)
	at org.apache.catalina.connector.CoyoteInputStream.read(CoyoteInputStream.java:167)
  • We try to deploy an application through the tomcat manager servlet, but it never completes

Resolution

  • Update to the latest RHEL tomcat package (tomcat-7.0.42-6.el7_0 and later provides the fix
  • Update to EWS 2.1.0 or later
  • Apply the CVE-2014-0075 patch to EWS 2.0.1

Root Cause

SBR
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