CVE-2016-9129 (published 2017-03-28T02:59Z)

Revive Adserver before 3.2.3 suffers from Information Exposure Through Discrepancy. It is possible to check whether or not an email address was associated to one or more user accounts on a target Revive Adserver instance by examining the message printed by the password recovery system. Such information cannot however be used directly to log in to the system, which requires a username.

Severity: MEDIUM
CVSS v2 base score: 5.0 (AV:N/AC:L/Au:N/C:P/I:N/A:N)
CVSS v3 base score: 5.3, MEDIUM (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N)

Weakness information:
cwe_id: CWE-200
cwe_name: Exposure of Sensitive Information to an Unauthorized Actor
description: The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.
extended_description: 
	   There are many different kinds of mistakes that introduce information exposures. The severity of the error can range widely, depending on the context in which the product operates, the type of sensitive information that is revealed, and the benefits it may provide to an attacker.  Some kinds of sensitive information include:
       
         private, personal information, such as personal messages, financial data, health records, geographic location, or contact details
         system status and environment, such as the operating system and installed packages
		 business secrets and intellectual property
		 network status and configuration
		 the product's own code or internal state
         metadata, e.g. logging of connections or message headers
		 indirect information, such as a discrepancy between two internal operations that can be observed by an outsider
       
	    Information might be sensitive to different parties, each of which may have their own expectations for whether the information should be protected.  These parties include:
               
                  the product's own users
                  people or organizations whose information is created or used by the product, even if they are not direct product users
		  the product's administrators, including the admins of the system(s) and/or networks on which the product operates
                  the developer
               
	    Information exposures can occur in different ways:
               
                  the code explicitly inserts sensitive information into resources or messages that are intentionally made accessible to unauthorized actors, but should not contain the information - i.e., the information should have been "scrubbed" or "sanitized"
                  a different weakness or mistake indirectly inserts the sensitive information into resources, such as a web script error revealing the full system path of the program.
                  the code manages resources that intentionally contain sensitive information, but the resources are unintentionally made accessible to unauthorized actors. In this case, the information exposure is resultant - i.e., a different weakness enabled the access to the information in the first place.
               
	    It is common practice to describe any loss of confidentiality as an "information exposure," but this can lead to overuse of CWE-200 in CWE mapping. From the CWE perspective, loss of confidentiality is a technical impact that can arise from dozens of different weaknesses, such as insecure file permissions or out-of-bounds read.  CWE-200 and its lower-level descendants are intended to cover the mistakes that occur in behaviors that explicitly manage, store, transfer, or cleanse sensitive information.
         
         

Fix information:
repo_url: https://github.com/revive-adserver/revive-adserver
commit_details: repo_url: https://github.com/revive-adserver/revive-adserver
author: Matteo Beccati
author_date: 2015-11-20 07:38:21+01:00
msg: Fix h1 report 98612

Information Exposure Through Discrepancy
----------------------------------------

Karan M. Tank and Smit B. Shah have reported via HackerOne that it was
possible to check whether or not an email address was associated to one or
more user accounts on a target Revive Adserver instance by examining the
message printed by the password recovery system. Such information cannot
however be used directly to log in to the system, which requires usernames
instead.

A CVE-ID has been requested, but not assigned yet.

CWE: CWE-203
CVSSv2: 5 (AV:N/AC:L/Au:N/C:P/I:N/A:N)
repository: repo_url: https://github.com/revive-adserver/revive-adserver
repo_name: revive-adserver/revive-adserver
description: The world's most popular free, open source ad serving system. You can download the latest release at:
repo_language: PHP
owner: revive-adserver
file_changes: filename: PasswordRecovery.php
change_type: ModificationType.MODIFY
diff: @@ -107,11 +107,9 @@ class OA_Admin_PasswordRecovery
                 $this->displayRecoveryRequestForm($GLOBALS['strEmailRequired']);
             } else {
                 $sent = $this->sendRecoveryEmail(stripslashes($vars['email']));
-                if ($sent) {
-                    $this->displayMessage($GLOBALS['strNotifyPageMessage']);
-                } else {
-                $this->displayRecoveryRequestForm($GLOBALS['strPwdRecEmailNotFound']);
-                }
+
+                // Always pretend an email was sent, even if not to avoid information disclosure
+                $this->displayMessage($GLOBALS['strNotifyPageMessage']);
             }
         } else {
             if (empty($vars['newpassword']) || empty($vars['newpassword2']) || $vars['newpassword'] != $vars['newpassword2']) {

programming_language: PHP
filename: default.lang.php
change_type: ModificationType.MODIFY
diff: @@ -1067,7 +1067,6 @@ $GLOBALS['strVariableCode'] = "Javascript tracking code";
 $GLOBALS['strForgotPassword'] = "Forgot your password?";
 $GLOBALS['strPasswordRecovery'] = "Password recovery";
 $GLOBALS['strEmailRequired'] = "Email is a required field";
-$GLOBALS['strPwdRecEmailNotFound'] = "Email address not found";
 $GLOBALS['strPwdRecWrongId'] = "Wrong ID";
 $GLOBALS['strPwdRecEnterEmail'] = "Enter your email address below";
 $GLOBALS['strPwdRecEnterPassword'] = "Enter your new password below";

programming_language: PHP