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Open-Xchange Server 6 / OX AppSuite 7.6.1 Cross Site Scripting

Open-Xchange Server 6 / OX AppSuite 7.6.1 Cross Site Scripting
Posted Jan 5, 2015
Authored by Martin Heiland, John de Kroon

Open-Xchange Server 6 / OX AppSuite versions 7.6.1 and below suffer from a cross site scripting vulnerability.

tags | advisory, xss
advisories | CVE-2014-8993
SHA-256 | 082a1460b2f65e6b4b3397a9ef978268baecb50e15bea63170fa4f7b077f109b

Open-Xchange Server 6 / OX AppSuite 7.6.1 Cross Site Scripting

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Product: Open-Xchange Server 6 / OX AppSuite
Vendor: Open-Xchange GmbH

Internal reference: 35512 (Bug ID)
Vulnerability type: Cross Site Scripting (CWE-80)
Vulnerable version: 7.6.1 and earlier
Vulnerable component: backend
Report confidence: Confirmed
Solution status: Fixed by Vendor
Fixed version: 7.4.2-rev40, 7.6.0-rev32, 7.6.1-rev11
Researcher credits: John de Kroon of Voiceworks B.V.
Vendor notification: 2014-11-18
Solution date: 2014-12-03
CVE reference: CVE-2014-8993
CVSSv2: 5.7 (AV:N/AC:M/Au:N/C:P/I:N/A:N/E:POC/RL:U/RC:C/CDP:LM/TD:H/CR:ND/IR:ND/AR:ND)

Vulnerability Details:
When embedding script code within a file that gets identified by the "application/xhtml+xml" mime-type and provides a valid XHTML doctype, the existing sanitizer does not get triggered and therefor does not remove potentially harmful script code. Since browsers detect the doctype information, the script code gets executed. The issue may be used to execute a stored cross-site scripting attack.

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.). Potential attack vectors are E-Mail (via attachments) or Drive.

Solution:
Users should update to the latest patch releases 7.4.2-rev40, 7.6.0-rev32 and 7.6.1-rev11 (or later).
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