Research and Development

Windows

Windows system objects are one of the interesting areas of binary application assessments that are often ignored or misunderstood. Many people don’t realise that abstract Windows application programming concepts such as mutexes, events, semaphores, shared memory sections, and jobs all come together under the purview of the Windows Object Manager. These objects, like those in the filesystem and registry namespaces, have all sorts of interesting security impacts when not properly managed. Continue reading

Inspired by GRSecurity‘s analysis of the Linux capabilities model, I thought I’d take a quick look at how Windows fares. The following is a brief analysis of the threats associated with each Se* privilege. Continue reading

The purpose of this document is to present a technical report of the CVE-2013-5065 vulnerability. A few days ago, FireEye identified a 0 day kernel exploit embedded within a PDF document actively used in the wild. The vulnerability itself is present in the NDProxy kernel driver. Whilst this is present in all versions of Windows, the vulnerability itself is only present in Windows 2003 and XP. The NDProxy driver is responsible for interfacing NDISWAN and CoNDIS WAN drivers to the TAPI services. Continue reading

Windows 2008 Server introduced a new feature known as Group Policy Preferences that allows administrators to deploy specific configurations that affect computers/users within a domain. This post details a serious problem associated with the use of Group Policy Preferences, specifically when a policy includes a username and encrypted password, which can result in a normal user being able to escalate their level of privilege on their local desktop/laptop and potentially compromise the security of the entire domain. Continue reading

Windows 2012 R2 servers use a newer version of the Remote Desktop Protocol (RDP) that has a feature that will be interest to both penetration testers and system administrators.  This post describes the new “Restricted Admin” feature, the security benefits it brings and a potential downside of the feature: Pass-the-Hash attacks.  We’ll briefly recap what Pass-the-Hash attack are and demonstrate such an attack against a Windows 2012 R2 server. A proof-of-concept (PoC) tool to carry out Pass-the-Hash attacks against Windows 2012 R2 server is also released – a trivial modification to the excellent FreeRDP client. Continue reading