Zero-day vulnerability in Microsoft Office

Heap-based buffer overflow

The vulnerability reffers to the APT28 and Operation Pawn Storm and was used in cyber espionage campaign by Tsar Team.

Known malware:


Vulnerability details

Advisory: SB2015063001 - Remote code execution in Microsoft Office

Vulnerable component: Microsoft Office

CVE-ID: CVE-2015-2424

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-122 - Heap-based Buffer Overflow


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

The vulnerability exists due to heap-based buffer overflow when processing Office files. A remote attacker can create a specially crafted Office file, trick the victim into opening it, cause memory corruption and execute arbitrary code with privileges of the current user.

Successful exploitation of this vulnerability results in arbitrary code execution on the vulnerable system.

Note: the vulnerability was being actively exploited.