Adobe Reader DC JavaScript CBSharedReviewCompleteAutomation JavaScript API Restrictions Bypass Vulnerability
Vulnerability Details
This vulnerability allows remote attackers to bypass JavaScript API restrictions on vulnerable installations of Adobe Reader DC. 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 within the CBSharedReviewCompleteAutomation method. By creating a specially crafted PDF with specific Javascript instructions, it is possible to bypass the Javascript API restrictions. An attacker can leverage this in conjunction with other vulnerabilities to execute code in the context of the current process.
Additional Details
Adobe has issued an update to correct this vulnerability. More details can be found at:
https://helpx.adobe.com/security/products/acrobat/apsb18-41.html
Disclosure Timeline
- 2018-09-25 - Vulnerability reported to vendor
- 2018-12-17 - Coordinated public release of advisory
Credit
Abdul-Aziz Hariri of Trend Micro Zero Day Initiative
