Zero-day vulnerability in Microsoft XML Core Services

Information disclosure
CVE-2014-0266

Microsoft and FireEye first discussed this issue in November, 2013.

Vulnerability details

Advisory: SB2014021101 - Information disclosure in Microsoft XML Core Services

Vulnerable component: Microsoft XML Core Services

CVE-ID: CVE-2014-0266

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

CWE-ID: CWE-284 - Improper Access Control

Description:

The vulnerability allows a remote attacker to obtain potentially sensitive information on the target system.

The weakness exists due to improper enforcement of cross-domain policies. A remote attacker can create a specially crafted Web page, trick the victim into visiting it using Internet Explorer, bypass cross-domain security restrictions and read local files or content from web domains the victim is authenticated with.

Successful exploitation of the vulnerability results in information disclosure on the vulnerable system.

Note: the vulnerability was being actively exploited.

External links:

https://technet.microsoft.com/en-us/library/security/ms14-005
https://www.symantec.com/security_response/vulnerability.jsp?bid=65407
https://www.beyondtrust.com/blog/february-2014-patch-tuesday/

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.