Session Persistence

Wed Mar 2 13:55:05 UTC 2022

Hi,

We are running nginx opensource with modsecuity. Nginnx is a proxy server.

We are also running an application, (which we proxy using nginx) that
crates reports and downloads images.

We are facing an issue with nginx session persistence.

During report creation, not all images are downloaded to the report. When
the page is refreshed, other images different from the initial ones are
displayed.

Nginx access.log shows the following

GET /prod/reportImage?rnd=1661411659&image=img_0_0_5 HTTP/1.1" 500 1692

Modscurity log shows the following

!doctype html><html lang="en"><head><title>HTTP Status 500 \xe2\x80\x93
Internal Server Error</title><style type="text/css">h1
{font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;font-size:22px;}
h2
{font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;font-size:16px;}
h3
{font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;font-size:14px;}
body
{font-family:Tahoma,Arial,sans-serif;color:black;background-color:white;} b
{font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;}
p
{font-family:Tahoma,Arial,sans-serif;background:white;color:black;font-size:12px;}
a {color:black;} a.name {color:black;} .line
{height:1px;background-color:#525D76;border:none;}</style></head><body><h1>HTTP
Status 500 \xe2\x80\x93 Internal Server Error</h1><hr class="line"
/><p><b>Type</b> Exception Report</p><p><b>Message</b> No JasperPrint
documents found on the HTTP session.</p><p><b>Description</b> The server
encountered an unexpected condition that prevented it from fulfilling the
request.</p><p><b>Exception</b></p><pre>javax.servlet.ServletException: *No
JasperPrint documents found on the HTTP
session.*\x0a\x09net.sf.jasperreports.j2ee.servlets.ImageServlet.service(ImageServlet.java:95)\x0a\x09javax.servlet.http.HttpServlet.service(HttpServlet.java:742)\x0a\x09org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)\x0a\x09com.ltc.app.server.ClickjackFilter.doFilter(ClickjackFilter.java:117)\x0a\x09org.apache.logging.log4j.web.Log4jServletFilter.doFilter(Log4jServletFilter.java:71)\x0a</pre><p><b>Note</b>
The full stack trace of the root cause is available in the server
logs.</p><hr class="line" /><h3>Apache Tomcat/8.5.41</h3></body></html>

Appreciate your help

*Morgan Kisienya*
*Managed Security Services*

*PO Box 139 Wahroonga NSW 2076*
*Mobile: +254 733 698 394*

*Web    : www.doveria.com <http://www.doveria.com/>Email : **morgan at doveria.com
<morgan at doveria.com>*

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