SRC-2018-0022 : Adobe Acrobat Pro DC HTML2PDF HTML Parsing window getMatchedCSSRules Use-After-Free Remote Code Execution Vulnerability

CVE ID:

CVE-2018-12792

CVSS Score:

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

Affected Vendors:

Adobe

Affected Products:

Acrobat Pro DC

Vulnerability Details:

This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Adobe Acrobat Pro 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 handling of window objects when calling getMatchedCSSRules during the parsing of HTML files in HTML2PDF. The issue results from the lack of validating the existence of an object prior to performing operations on the object. An attacker can leverage this vulnerability to execute code in 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/acrobat/apsb18-21.html

Disclosure Timeline:

• 2018-06-05 – Verified and acquired by iDefense
• 2018-07-13 – Coordinated public release of advisory

Credit:

This vulnerability was discovered by Steven Seeley (mr_me) of Source Incite

Acknowledgments:

Source Incite would like to acknowledge iDefense's Vulnerability Contributor Program for the help with co-ordination of this vulnerability.