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Category:   Application (E-mail Server)  >   Open-Xchange Vendors:   Open-Xchange Inc.
Open-Xchange App Suite Input Validation Flaws Let Remote Conduct Cross-Site Scripting Attacks
SecurityTracker Alert ID:  1036296
SecurityTracker URL:  http://securitytracker.com/id/1036296
CVE Reference:   CVE-2016-5124   (Links to External Site)
Date:  Jul 13 2016
Impact:   Disclosure of authentication information, Disclosure of user information, Execution of arbitrary code via network, Modification of user information
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 7.8.1 and prior
Description:   Several vulnerabilities were reported in Open-Xchange App Suite. A remote user can conduct cross-site scripting attacks.

The HTML editor does not properly filter HTML code from user-supplied input before displaying the input when a user adds an external image by dragging and dropping to the HTML editor. A remote user can create a specially crafted image that, when added to the HTML editor by a target user, will cause arbitrary scripting code to be executed by the target user's browser. The code will originate from the site running the Open-Xchange software and will run in the security context of that site. As a result, the code will be able to access the target user's cookies (including authentication cookies), if any, associated with the site, access data recently submitted by the target user via web form to the site, or take actions on the site acting as the target user.

Images with an '<a>' tag that contains scripting code in the "onload" or "onerror" parameters can trigger this flaw.

Sasi Levi reported this vulnerability.

The system does not properly filter HTML code from user-supplied input in Adobe Flash files before displaying the input when a user adds an external image by dragging and dropping to the HTML editor. A remote user can create a specially crafted binary flash file containing Javascript that, when opened by the target user via the 'Open in browser' from a mail attachment or from the OX Drive, will cause arbitrary scripting code to be executed by the target user's browser. The code will originate from the site running the Open-Xchange software and will run in the security context of that site. As a result, the code will be able to access the target user's cookies (including authentication cookies), if any, associated with the site, access data recently submitted by the target user via web form to the site, or take actions on the site acting as the target user.

The system does not properly filter HTML code from user-supplied input in OX Documents spreadsheet files before displaying the input when a user adds an external image by dragging and dropping to the HTML editor. A remote user can create a specially crafted spreadsheet file containing Javascript in annotated cells that, when hovered over by the target user, will cause arbitrary scripting code to be executed by the target user's browser. The code will originate from the site running the Open-Xchange software and will run in the security context of that site. As a result, the code will be able to access the target user's cookies (including authentication cookies), if any, associated with the site, access data recently submitted by the target user via web form to the site, or take actions on the site acting as the target user.

Impact:   A remote user can access the target user's cookies (including authentication cookies), if any, associated with the site running the Open-Xchange software, access data recently submitted by the target user via web form to the site, or take actions on the site acting as the target user.
Solution:   The vendor has issued a fix (7.6.2-rev55, 7.6.3-rev13, 7.8.0-rev32, 7.8.1-rev14).

[Editor's note: Two of the vulnerabilities were fixed in earlier 'rev' versions than the versions listed above.]

Vendor URL:  www.open-xchange.com/ (Links to External Site)
Cause:   Input validation error
Underlying OS:  Linux (Any), UNIX (Any), Windows (Any)

Message History:   None.


 Source Message Contents

Subject:  Open-Xchange Security Advisory 2016-07-13

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Product: OX App Suite
Vendor: OX Software GmbH

Internal reference: 45796 / 45811 (Bug ID)
Vulnerability type: Cross Site Scripting (CWE-80)
Vulnerable version: 7.8.1 and earlier
Vulnerable component: frontend
Report confidence: Confirmed
Solution status: Fixed by Vendor
Fixed version: 7.6.2-rev44, 7.6.3-rev13, 7.8.0-rev25, 7.8.1-rev12
Researcher credits: Sasi Levi
Vendor notification: 2016-05-04
Solution date: 2016-06-07
Public disclosure: 2016-07-13
CVE reference: CVE-2016-5124
CVSS: 4.3 (CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N)

Vulnerability Details:
Adding images from external sources to HTML editors by drag&drop can potentially lead to script code execution in the context of the active user. To exploit this, a user needs to be tricked to use a image from a specially crafted website and add it to HTML editor areas of OX App Suite, for example E-Mail Compose or OX Text. This specific attacks circumvents typical XSS filters and detection mechanisms since the code is not loaded from an external service but injected locally.

Risk:
Malicious script code can be executed within a users context. This can lead to session hijacking or triggering unwanted actions via the web interface (sending mail, deleting data etc.). To exploit this vulnerability, a attacker needs to convince a user to follow specific steps (social-engineering).

Steps to reproduce:
Create a website that contains an image where the images <a> tag contains specific script code as "onload" or "onerror" parameters. Adding conditions to the code helps to avoid early discovery of the malicious code.

Solution:
Users should not include content from untrusted external sources. External content may be downloaded first and then added to avoid the attack vector. Switching to plain-text mode mitigates this attack for E-Mail. Operators should update to the latest Patch Release



Internal reference: 46026 (Bug ID)
Vulnerability type: Cross Site Scripting (CWE-80)
Vulnerable version: 7.8.1 and earlier
Vulnerable component: backend
Report confidence: Confirmed
Solution status: Fixed by Vendor
Fixed version: 7.6.2-rev55, 7.6.3-rev12, 7.8.0-rev32, 7.8.1-rev14
Vendor notification: 2016-05-13
Solution date: 2016-06-07
Public disclosure: 2016-07-13
CVE reference: CVE-2016-5124
CVSS: 4.3 (CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N)

Vulnerability Details:
Adobe Flash files can be used to transport javascript code. Those files were not detected nor sanitized and therfor presented to the user.

Risk:
Malicious script code can be executed within a users context. This can lead to session hijacking or triggering unwanted actions via the web interface (sending mail, deleting data etc.).

Steps to reproduce:
Create a binary flash file that contains JS code and "Open in browser" that file as mail attachmen or OX Drive item

Solution:
Users should not open attachments from untrusted external sources. Operators should update to the latest Patch Release




Internal reference: 46025 (Bug ID)
Vulnerability type: Cross Site Scripting (CWE-80)
Vulnerable version: 7.8.1 and earlier
Vulnerable component: spreadsheet
Report confidence: Confirmed
Solution status: Fixed by Vendor
Fixed version: 7.6.2-rev15, 7.6.3-rev3, 7.8.0-rev9, 7.8.1-rev9
Vendor notification: 2016-05-13
Solution date: 2016-06-07
Public disclosure: 2016-07-13
CVE reference: CVE-2016-5124
CVSS: 4.3 (CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N)

Vulnerability Details:
OX Documents Spreadsheet uses data from cells when annotating certain charts, such as bubble graphs. When adding javascript code to those cells, it gets executed when hovering charts and trigger those annotations.

Risk:
Malicious script code can be executed within a users context. This can lead to session hijacking or triggering unwanted actions via the web interface (sending mail, deleting data etc.).

Steps to reproduce:
Create a Spreadsheet file that contains script code as axis name and build a bubble chart from that data. Then hover the bubbles.

Solution:
Users should not open documents from untrusted external sources. Operators should update to the latest Patch Release

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