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Open-Xchange Security Advisory 2016-07-13



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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