Advisory ID: SYSS-2020-011
Product: Apple iOS
Manufacturer: Apple Inc.
Affected Version(s): 13.3.1, 13.5.1
Tested Version(s): 13.3.1, 13.5.1
Vulnerability Type: Exposure of Resource to Wrong Sphere (CWE-668)
Risk Level: Medium
Solution Status: Open
Manufacturer Notification: 2020-03-23
Solution Date: -
Public Disclosure: 2020-07-02
CVE Reference: Not yet assigned
Author of Advisory: Philipp Buchegger, SySS GmbH

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Overview:

iOS (formerly iPhone OS) is a mobile operating system created and
developed by Apple Inc. exclusively for its hardware. It is the
operating system that presently powers many of the company's mobile
devices, including the iPhone.

On a company device with DEP (Device Enrollment Program), it is possible
to enforce certain restrictions in order to separate company from
private data.

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Vulnerability Details:

It is possible to circumvent the copy & paste restriction from the
company profile to the private profile. Thus, it is possible to extract
attachments that can be previewed ("Quick Look") in the native Mail
client to any private app.

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Proof of Concept (PoC):

The vulnerability can be demonstrated and reproduced in the following
way:

1. Receive a PDF document in the native Mail app via a managed Exchange
   profile

2. On a managed and restricted device, copying this document is not
   possible

3. Tap and hold the PDF document, select "Quick Look"/"Übersicht"

4. Open the "Share..." dialog

5. Copy the document - this was not permitted in the previous view

6. Paste it in any private app, for example in "Files";
   for further demonstration, the Adobe Acrobat app was used

7. Access the file locally with any installed app

8. Download the digital document (no screen dump, a perfect digital copy
   of the original document) as PDF via USB

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Solution:

SySS GmbH is not aware of a solution for this reported security
vulnerability.

Apple does not consider the described security issue to be a security
vulnerability and has not fixed it yet.

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Disclosure Timeline:

2020-03-22: Vulnerability discovered
2020-03-23: Vulnerability reported to manufacturer
2020-03-30: E-mail to manufacturer concerning status update
2020-04-14: E-mail from manufacturer concerning status update
2020-04-15: E-mail to manufacturer concerning status update
2020-04-17: E-mail from manufacturer concerning status update
2020-05-01: Product security of manufacturer responds that the reported
            issue is not a security vulnerability, but it has been
            passed along to the appropriate team
2020-05-08: E-Mail to manufacturer regarding status update from the
            informed team and publication of the security issue
2020-05-12: E-mail to manufacturer concerning status update
2020-05-13: E-mail from manufacturer regarding publication
2020-05-14: Provided proof of concept video to manufacturer
2020-06-18: E-mail from manufacturer concerning status update
2020-07-02: Public release of security advisory

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References:

[1] Product website for Apple iOS
    https://www.apple.com/de/ios/ios-13/
[2] SySS Security Advisory SYSS-2020-011

https://www.syss.de/fileadmin/dokumente/Publikationen/Advisories/SYSS-2020-011.txt
[3] SySS Responsible Disclosure Policy
    https://www.syss.de/en/news/responsible-disclosure-policy/
[4] SySS Proof of Concept Video
    https://www.youtube.com/watch?v=82jbJzdxPFY

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Credits:

This security vulnerability was found by Philipp Buchegger of SySS GmbH.

E-Mail: philipp.buchegger@syss.de
Public Key: ://www.syss.de/fileadmin/dokumente/PGPKeys/Philipp_Buchegger.asc
Key ID: 0x065809F0BB6747E8
Key Fingerprint: 489F 34EE FA88 27DE 69A0 756B 0658 09F0 BB67 47E8

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Disclaimer:

The information provided in this security advisory is provided "as is"
and without warranty of any kind. Details of this security advisory may
be updated in order to provide as accurate information as possible. The
latest version of this security advisory is available on the SySS Web
site.

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Copyright:

Creative Commons - Attribution (by) - Version 3.0
URL: http://creativecommons.org/licenses/by/3.0/deed.en