This vulnerability was discovered by Patrick DeSantis.
Talos recently discovered a vulnerability in Allen-Bradley Rockwell Automation MicroLogix 1400 Programmable Logic Controllers (PLCs) related to the default configuration that is shipped with devices running affected versions of firmware. This vulnerability is due to the presence of an undocumented SNMP community string that could be leveraged by an attacker to gain full control of affected devices and grants the ability to manipulate configuration settings, replace the firmware running on the device with attacker-controlled code, or otherwise disrupt device operations. Depending on the role of the affected PLC within an industrial control process, this could result in significant damages.
In addition to the default, documented SNMP community string of ‘public’ (read) and ‘private’ (read/write), an undocumented community string of ‘wheel’ (read/write) also exists, which enables attackers to make unauthorized device changes, such as modification of settings or conducting malicious firmware updates. It is possible that this community string allows access to other OIDs, however Talos tested specific use cases.
Discovered by Marcin ‘Icewall’ Noga of Cisco Talos
Talos is releasing an advisory for a vulnerability in BlueStacks App Player. (TALOS-2016-0124/CVE-2016-4288). The BlueStacks App Player is designed to enable Android applications to run on Windows PCs and Macintosh computers. It’s commonly used to run popular Android games on these platforms.
A weak registry key permission vulnerability exists in the BlueStacks application. By default the BlueStack installer sets a weak permission to the registry key, which contains InstallDir reg value, this can be used later by the BlueStacks service component. This default configuration gives a malicious user the ability to modify this value, which can lead to privilege escalation.
This post was authored by Edmund Brumaghin and Jonah Samost
Today is Patch Tuesday for August 2016, and Microsoft has released several security bulletins and associated patches to resolve security issues across their products. This month’s patch release includes 9 bulletins addressing 28 vulnerabilities. Five of the bulletins Microsoft has released are rated Critical and address vulnerabilities in Internet Explorer, Edge, Windows Graphics Component, Microsoft Office, and the Windows PDF library. The remaining four bulletins are rated Important and address vulnerabilities in Windows Kernel-Mode Drivers, Secure Boot, Windows Authentication Methods, and ActiveSyncProvider.
Bulletins Rated Critical
Microsoft has listed bulletins MS16-095, MS16-096, MS16-097, MS16-099, MS16-102 as critical in this month’s release.
MS16-095 and MS16-096 are this month’s bulletins addressing security vulnerabilities associated with Microsoft Internet Explorer and Edge. The Internet Explorer bulletin addresses a total of nine vulnerabilities, including five memory corruption bugs and four information disclosure vulnerabilities. The Edge bulletin covers a total of eight vulnerabilities, including a remote code execution vulnerability, four memory corruption bugs and three information disclosure vulnerabilities. The Internet Explorer bulletin is rated Critical for affected Windows clients and Moderate for affected Windows Servers.
Macros have been used since the mid 1990s to spread malware and infect systems. Increased user awareness of the need to disable the macro function within Microsoft Word during the late 90s and early 2000s sent these malware into decline. However, a change in Microsoft (MS) Office file formats dating from 2007 is now being actively exploited to hide the presence of macros and distribute malware at an increasing rate.
In this article, I show how MS Office file formats are being abused and obfuscated, and the extent of distribution of macro malware.
Talos recently published research regarding a new variant of destructive ransomware, which we dubbed Ranscam. During further analysis of Ranscam samples, we discovered several indicators of compromise (IOCs) that piqued our curiosity as to which malware this threat actor might be involved in or responsible for besides Ranscam. We began to expand the scope of our research into other destructive “ranscamware” in an effort to determine if they had any shared characteristics that might indicate the same threat actor or group might be responsible for multiple variants. We found several interesting ties between known destructive ransomware variants such as Jigsaw and AnonPop which correlated with the threat actor we believe to be responsible for Ranscam.
Vulnerabilities discovered by Aleksandar Nikolic. Blog post authored by Jaeson Schultz and Aleksandar Nikolic.
One of the most fundamental tasks performed by many software programs involves the reading, writing, and general processing of files. In today’s highly networked environments, files and the programs that process them can be found just about everywhere: FTP transfers, HTTP form uploads, email attachments, et cetera.
Because computer users interact with files of so many different varieties on such a regular basis, Oracle Corporation has designed tools to assist programmers with writing software that will support these everyday tasks: Outside In Technology (OIT). From the OIT website: “Outside In Technology is a suite of software development kits (SDKs) that provides developers with a comprehensive solution to extract, normalize, scrub, convert and view the contents of 600 unstructured file formats.”
In April, Talos blogged about one of the OIT-related arbitrary code execution bugs patched by Oracle. The impact of that vulnerability, plus these additional eighteen OIT bugs disclosed in this post, is severe because so many third-party products use Oracle’s OIT to parse and transform files. A review of an OIT-related CERT advisory from January 2016 reveals a large list of third-party products, especially security and messaging-related products, that are affected. The list of products that, according to CERT, rely on Oracle’s Outside In SDK includes:
- Avira AntiVir for Exchange – antivirus protection for Microsoft Exchange
- IBM WebSphere Portal – provides enterprise web portals
- Google Search Appliance – search all content in an enterprise through a single search box
- Guidance Encase – forensic investigation software
- Microsoft Exchange – enterprise email and productivity software
- Novell Groupwise – a collaboration tool for large enterprise
- Raytheon SureView – software designed for enterprise visibility and user activity monitoring
- Veritas (Symantec) Enterprise Vault – a program for information governance through archiving