Zero-day vulnerability in Windows

Memory corruption
CVE-2015-2387

The exploit code was revealed after Hacking Team data leak.
Public exploit code for this vulnerability became available as part of the Hacking Team leaks on July 5, 2015.

Vulnerability details

Advisory: SB2015070702 - Arbitrary code execution in Microsoft Windows

Vulnerable component: Windows

CVE-ID: CVE-2015-2387

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

CWE-ID: CWE-119 - Memory corruption

Description:

The vulnerability allows a local attacker to gain elevated privileges on the target system.

The weakness exists due to boundary error in the Adobe Type Manager module (ATMFD.dll). A local attacker can execute a specially crafted application, trigger memory corruption, bypass OS-level sandboxing and execute arbitrary code with SYSTEM privileges.

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

Note: the vulnerability was being actively exploited.

External links:

https://technet.microsoft.com/en-us/library/security/ms15-077.aspx http://blog.trendmicro.com/trendlabs-security-intelligence/a-look-at-the-open-type-font-manager-vuln...
http://www.securityweek.com/microsoft-patches-hacking-team-zero-days-other-vulnerabilities
https://countuponsecurity.com/2015/07/24/hacking-team-arsenal-of-cyber-weapons/
https://securingtomorrow.mcafee.com/business/security-connected/microsoft-patch-tuesday-july-2015/
http://www.bankinfosecurity.com/hacking-team-dump-windows-zero-day-a-8404
https://www.secureworks.com/blog/targeted-exploit-and-escalation

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.