Zero-day vulnerability in Microsoft Office

ASLR bypass
CVE-2013-5057

Vulnerability details

Advisory: SB2013121003 - ASLR bypass in Microsoft Office

Vulnerable component: Microsoft Office

CVE-ID: CVE-2013-5057

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

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

Description:

The vulnerability allows a remote attacker to bypass certain security restrictions.

The weakness exists due to improper implementation of Address Space Layout Randomization (ASLR) within HXDS Office shared component. A remote attacker can create a specially crafted Web site, trick the victim into visiting it and bypass the ASLR security feature.

Successful exploitation of the vulnerability may result in attacker's access to the vulnerable system.

Note: the vulnerability was being actively exploited.

External links:

https://blogs.technet.microsoft.com/srd/2013/12/09/ms13-106-farewell-to-another-aslr-bypass/
https://technet.microsoft.com/en-us/library/security/ms13-106.aspx
https://www.symantec.com/security_response/vulnerability.jsp?bid=64095

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.