Zero-day vulnerability in Adobe Acrobat

Double free memory error
CVE-2018-4990

In March 2018 ESET detected attacks using two zero-day vulnerabilities in Microsoft win32k.sys driver (CVE-2018-8120) and and Adobe Acrobat.

Known malware:

JS/Exploit.Pdfka.QNV trojan (ESET)

Vulnerability details

Advisory: SB2018051506 - Multiple vulnerabilities in Adobe Reader and Acrobat

Vulnerable component: Adobe Acrobat

CVE-ID: CVE-2018-4990

CVSSv3 score: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H/E:H/RL:O/RC:C

CWE-ID: CWE-415 - Double Free

Description:

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The weakness exists due to double free memory error when handling malicious input. A remote attacker can trick the victim into opening a specially crafted .pdf file and execute arbitrary code with privileges of the current user.

Successful exploitation of the vulnerability may result in system compromise.
Note: the vulnerability has being exploited in the wild in March 2018 along with exploit for SB2018050813.

External links:

https://www.welivesecurity.com/2018/05/15/tale-two-zero-days/
https://blog.malwarebytes.com/threat-analysis/2018/05/adobe-reader-zero-day-discovered-alongside-win...

About zero-day vulnerabilities

Zero-day vulnerability is an undisclosed vulnerability in software that hackers can exploit to compromise computer programs, gain unauthorized access to sensitive data, penetrate networks, etc. We consider vulnerability a zero-day when there is no solution provided from software vendor and the vulnerability is being actively exploited by malicious actors.

Zero-day candidate is a potential zero-day vulnerability in software which might have been used in targeted attacks, however there is no evidence to support this suggestion.