usd-2019-0001 | Adobe Experience Manager (AEM)/6.3.2.2

Advisory ID: usd-2019-0001
Affected Version: 6.3.2.2
Vulnerability Type: Code Injection
Impact: High
First Pubslished: 2019-07-31
Last Update: 2019-05-20

Details

Security Risk: High
Vendor URL: https://www.adobe.com/
Vendor Status: Not fixed
Advisory Status: Open

Introduction

The attacker can create a site with a malicious title, which contains an Excel formula. When the list of sites is exported by another user and opened in
Microsoft Excel, the formula is evaluated. In the PoC, this is used to launch the Windows calculator.

PoC

1) A site is created with the payload as title.
2) Then the path with the page is getting exported as CSV.
3) The title will be written into the CSV as it is, therefore making the injection possible.

Payload: „,;=2+5+cmd|‘ /C calc‘!A0;
This will result with the following row in the csv:
„‚“,;=2+5+cmd|‘ /C calc‘!A0;“,“/content/rsb/de/sureroute1″,“sureroute1″,[…] The ; will be interpreted as new column and therefore place the payload in an
own column. This will lead to the execution of calc.exe.

Fix

Escape special characters in CSV / prevent escape from „“

Timeline

  • 2019-01-16 Advisory sent to PSIRT@adobe.com
  • 2019-02-14 Adobe PSIRT respond they won’t fix it.

Credits

This security vulnerabilities were found by Markus Schader of usd AG.

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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.