SEC Consult Vulnerability Lab Security Advisory < 20190821-0 >  
title: Unauthenticated sensitive information leakage  
product: Zoho Corporation ManageEngine ServiceDesk Plus  
vulnerable version: v10 <10509  
fixed version: v10 >=10509  
CVE number: CVE-2019-15045, CVE-2019-15046  
impact: Critical  
found: 2019-06-27  
by: Johannes Greil (Office Vienna)  
SEC Consult Vulnerability Lab  
An integrated part of SEC Consult  
Europe | Asia | North America  
Vendor description:  
"ServiceDesk Plus is a game changer in turning IT teams from daily  
fire-fighting to delivering awesome customer service. It provides great  
visibility and central control in dealing with IT issues to ensure that  
businesses suffer no downtime. For 10 years and running, it has been  
delivering smiles to millions of IT folks, end users, and stakeholders  
Business recommendation:  
The vendor provides a patched version and it should be installed immediately.  
Furthermore, a thorough security analysis is highly recommended as only a short  
spot check has been performed and further critical issues are to be expected.  
A workaround exists for mitigating vulnerability 1b (user enumeration).  
Vulnerability overview/description:  
1) Unauthenticated sensitive information leakage  
a) Unauthenticated download of internal support ticket information (CVE-2019-15046)  
The software offers functionality (fosagent) that an unauthenticated attacker can  
exploit in order to gain information of internal "events". In our test it was  
possible to access sensitive internal information (tickets) written by users of  
this application in exchange with the support team. Depending on the contents of  
the tickets, sensitive data might leak through this functionality. It is likely,  
that it also depends on the configuration of ServiceDesk Plus which information is  
stored in those "events".  
b) User Enumeration in AjaxDomainServlet (CVE-2019-15045)  
It is possible to collect valid usernames by interacting with the  
"AjaxDomainServlet" function of the application without prior authentication.  
This vulnerability is useful to increase the efficiency of brute force attacks.  
If the username is known, it is easier to find the corresponding password.  
Furthermore, the servlet leaks information, whether the user is a locally  
configured or a domain user and it also leaks the internal domain names of the  
requested user account.  
According to the vendor, the affected feature is intended behaviour and a  
workaround in order to disable it has been provided (see further below).  
Proof of concept:  
1) Unauthenticated sensitive information leakage  
a) Unauthenticated download of internal support ticket information (CVE-2019-15046)  
The "fosagent" functionality provides a "download-file" servlet which an  
unauthenticated attacker can use in order to iterate through existing internal  
"events". The information that can be downloaded looks like internal ticket system  
information and other data exchanged between users and the help desk support team.  
It is necessary to supply the "log-pos" parameter given a number followed by a  
colon character and another number to access the corresponding event index. An  
attacker can just increment those numbers and access different information.  
b) User Enumeration in AjaxDomainServlet (CVE-2019-15045)  
The following URL can be used to efficiently enumerate user accounts configured  
within ManageEngine ServiceDesk Plus. No prior authentication is required for  
this functionality. The "search" parameter is used for supplying the user account  
If the user exists and is a local user (configured within the web application)  
it will show "Not in Domain" as a result. If the user exists and is a domain  
user (e.g. LDAP) it will show the corresponding internal domain name as a result.  
If the page stays empty the user does not exist.  
Vulnerable / tested versions:  
Version 10 has been tested. The vendor did not confirm whether older releases are  
affected as well.  
Vendor contact timeline:  
2019-07-02: Contacting vendor through ManageEngine Security Response Center  
Uploaded security advisory to  
2019-07-02: Vendor: acknowledged our report and will get back to us soon  
2019-07-08: Asking for a status update; reponse: "we've investigated the report  
and working on the fix now"  
2019-07-10: Asking about CVE numbers and requesting heads-up before release  
2019-08-13: Asking for a status update  
2019-08-13: Vendor: vulnerability has already been fixed and released in version  
2019-08-21: Release of security advisory  
The vendor provides an updated version which should be installed immediately.  
The vendor also provided a link to their readme about the new release:  
Vulnerability 1b - User Enumeration: the affected feature is intended behaviour  
for usability but the vendor provided a workaround in order to disable this  
The admin can disable this in:  
Admin-Self-Service Portal Settings (Configuration - Allow Domain Filtering during  
Advisory URL:  
SEC Consult Vulnerability Lab  
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EOF J. Greil / @2019