SRC-2017-0006 : Adobe Digital Editions ePub Container File External Entity Processing Information Disclosure Vulnerability

CVE ID:

CVE-2017-11272

CVSS Score:

4.3, (AV:N/AC:M/Au:N/C:P/I:N/A:N)

Affected Vendors:

Adobe

Affected Products:

Adobe Digital Editions

Vulnerability Details:

This vulnerability allows remote attackers to disclose sensitive information on vulnerable installations of Adobe Digital Editions. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file.

The specific flaw exists when processing ePub Container Files. Due to the improper restriction of XML External Entity (XXE) reference, a specially crafted ePub file can cause the XML parser to access the contents of this URI and embed these contents back into the XML document for further processing. An attacker can leverage this vulnerability to disclose sensitive information under the context of the current process.

Vendor Response:

Adobe has issued an update to correct these vulnerabilities. More details can be found at:
https://helpx.adobe.com/security/products/Digital-Editions/apsb17-27.html

Disclosure Timeline:

  • 2016-10-24 – Verified and sent to Adobe PSIRT
  • 2017-08-08 – Coordinated public release of advisory

Proof of Concept:

https://github.com/sourceincite/poc/blob/master/SRC-2017-0006.py

Credit:

This vulnerability was discovered by Steven Seeley of Source Incite