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@RISK provides a reliable weekly summary of (1) newly discovered attack vectors, (2) vulnerabilities with active new exploits, (3) insightful explanations of how recent attacks worked, and other valuable data

A key purpose of the @RISK is to provide the data that will ensure that the 20 Critical Controls (the US and UK benchmark for effective protection of networked systems) continue to be the most effective defenses for all known attack vectors. But since it is also valuable for security practitioners, SANS is making it available to the 145,000 security practitioners who have completed SANS security training and others at their organizations who hope to stay current with the offensive methods in use.

September 21, 2017

@RISK: The Consensus Security Vulnerability Alert

Vol. 17, Num. 38

Providing a reliable, weekly summary of newly discovered attack vectors, vulnerabilities with active exploits, and explanations of how recent attacks worked

Archived issues may be found at http://www.sans.org/newsletters/at-risk



MOST PREVALENT MALWARE FILES 2017-09-12 - 2017-09-19


TOP VULNERABILITY THIS WEEK: CCleaner Found To Be Compromised with Malicious Backdoor

******************** Sponsored By Veracode ********************

Most individuals working on blue, intelligence, or reverse engineering teams have worked with indicators of compromise (IOC) or indicators of attack (IOA). But, many analysts still have several questions related to how these indicators are sourced, processed, and pivoted on. Register for this webinar, and join Rebekah Brown and DomainTools Sr. Researcher Kyle Wilhoit as they walk through all things indicators! http://www.sans.org/info/198420



-- SANS October Singapore 2017 | October 9-28 | http://www.sans.org/u/tIA

-- SANS Secure DevOps Summit & Training | Denver, CO | October 10-17 | http://www.sans.org/u/utw

-- SANS Brussels Autumn 2017 | October 16-21 | http://www.sans.org/u/twY

-- SANS Tokyo Autumn 2017 | October 16-28 | http://www.sans.org/u/thk

-- SANS San Diego 2017| October 30-November 4 | http://www.sans.org/u/uWt

-- SANS Pen Test HackFest Summit & Training | Bethesda, MD | November 13-20 | http://www.sans.org/u/waL

-- SANS San Francisco Winter 2017 | November 27-December 2 | http://www.sans.org/u/wgE

-- SANS London November 2017 | November 27-December 2 | http://www.sans.org/u/wgJ

-- SANS Cyber Defense Initiative ® 2017 | Washington, DC | December 12-19 | http://www.sans.org/u/vNd

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Title: CCleaner Found To Be Compromised with Malicious Backdoor
Description: CCleaner, a well known and frequently used PC cleanup utility, has been found to contain a malicious backdoor for versions released between Aug 15 and Sept 12. Research indicates that this is a supply chain attack as the compromised versions of CCleaner were signed with a valid code-signing certificate. Users and administrators who find that a compromised version of CCleaner has been installed on their system should wipe and reimage systems. Piriform has removed the compromised versions of CCleaner from their website. Reference:
- http://blog.talosintelligence.com/2017/09/avast-distributes-malware.html
- http://blog.morphisec.com/morphisec-discovers-ccleaner-backdoor
Snort SID: N/A
ClamAV: Win.Trojan.Floxif-6336251-0

Title: VMware Patches Security Vulnerabilities in ESXi, vCenter Server, Fusion, and Workstation
Description: VMware has released a security advisory to address three vulnerabilities that have been identified in ESXi, vCenter Server, Fusion, and Workstation. The most critical bug addressed in this release is CVE-2017-4924 which affects Fusion and Workstation and could allow arbitrary code to be executed on the host. Another important vulnerability addressed is CVE-2017-4925 which could allow normal users to crash VMs due to a null dereference. The final vulnerability is a XSS flaw in vCenter Server. VMware has released a software update which addresses these security vulnerabilities.
- https://www.vmware.com/security/advisories/VMSA-2017-0015.html



An (un)documented Word feature abused by attackers

Equifax Hackers Stole 200k Credit Card Accounts in One Fell Swoop

Thousands of Elasticsearch Servers Compromised, Found To Be Part Of Malware Botnet

WordPress' Poor Handling of Plugin Security Exacerbates Malicious Takeover of Display Widgets

High-Level Approaches for Finding Vulnerabilities



This is a list of recent vulnerabilities for which exploits are available. System administrators can use this list to help in prioritization of their remediation activities. The Qualys Vulnerability Research Team compiles this information based on various exploit frameworks, exploit databases, exploit kits and monitoring of internet activity.

ID: CVE-2017-8759
Title: Microsoft .NET Framework Remote Code Execution Vulnerability
Vendor: Microsoft
Description: A remote code execution vulnerability exists when Microsoft .NET Framework processes untrusted input. Microsoft is aware of a report that an exploit for CVE-2017-8759 exists in the wild and is being used in targeted attacks.
Microsoft published a .NET security update to address this issue.
CVSS v2 Base Score: 10.0 (AV:N/AC:L/Au:N/C:C/I:C/A:C)

ID: CVE-2017-9805
Title: Apache Struts REST plugin Remote Code Execution (S2-052)
Vendor: Apache Struts
Description: The REST Plugin is using a XStreamHandler with an instance of XStream for deserialization without any type filtering and this can lead to Remote Code Execution when deserializing XML payloads.
CVSS v2 Base Score: 10.0 (AV:N/AC:L/Au:N/C:C/I:C/A:C)

ID: CVE-2017-0037
Title: Microsoft Internet Explorer Remote Code Execution (MS17-007)
Vendor: Microsoft
Description: Microsoft Internet Explorer 10 and 11 and Microsoft Edge have a type confusion issue in the
Layout::MultiColumnBoxBuilder::HandleColumnBreakOnColumnSpanningElement function in mshtml.dll, which allows remote attackers to execute arbitrary code via vectors involving a crafted Cascading Style Sheets (CSS) token sequence and crafted JavaScript code that operates on a TH element.
CVSS v2 Base Score: 7.6 (AV:N/AC:H/Au:N/C:C/I:C/A:C)

ID: CVE-2017-0145
Title: Microsoft Windows SMB Remote Code Execution Vulnerability
Vendor: Microsoft
Description: The SMBv1 server in Microsoft Windows Vista SP2; Windows Server 2008 SP2 and R2 SP1; Windows 7 SP1; Windows 8.1; Windows Server 2012 Gold and R2; Windows RT 8.1; and Windows 10 Gold, 1511, and 1607; and Windows Server 2016 allows remote attackers to execute arbitrary code via crafted packets, aka "Windows SMB Remote Code Execution Vulnerability." This vulnerability is different from those described in CVE-2017-0143, CVE-2017-0144, CVE-2017-0146, and CVE-2017-0148.
CVSS v2 Base Score: 10.0 (AV:N/AC:L/Au:N/C:C/I:C/A:C)

ID: CVE-2017-0290
Title: Microsoft Malware Protection Engine Remote Code Execution Vulnerability
Vendor: Microsoft
Description: NScript in mpengine in Microsoft Malware Protection Engine with Engine Version before 1.1.13704.0, as used in Windows Defender and other products, allows remote attackers to execute arbitrary code or cause a denial of service (type confusion and application crash) via crafted JavaScript code within any file scanned by this engine.
CVSS v2 Base Score: 10.0 (AV:N/AC:L/Au:N/C:C/I:C/A:C)

ID: CVE-2017-3881
Title: Cisco IOS and IOS XE Software Cluster Management Protocol Remote Code Execution Vulnerability
Vendor: Cisco
Description: A vulnerability in the Cisco Cluster Management Protocol (CMP) processing code in Cisco IOS and Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause a reload of an affected device or remotely execute code with elevated privileges. The Cluster Management Protocol utilizes Telnet internally as a signaling and command protocol between cluster members. The vulnerability is due to the combination of two factors: (1) the failure to restrict the use of CMP-specific Telnet options only to internal, local communications between cluster members and instead accept and process such options over any Telnet connection to an affected device; and (2) the incorrect processing of malformed CMP-specific Telnet options. An attacker could exploit this vulnerability by sending malformed CMP-specific Telnet options while establishing a Telnet session with an affected Cisco device configured to accept Telnet connections. An exploit could allow an attacker to execute arbitrary code and obtain full control of the device or cause a reload of the affected device. This affects Catalyst switches, Embedded Service 2020 switches, Enhanced Layer 2 EtherSwitch Service Module, Enhanced Layer 2/3 EtherSwitch Service Module, Gigabit Ethernet Switch Module (CGESM) for HP, IE Industrial Ethernet switches, ME 4924-10GE switch, RF Gateway 10, and SM-X Layer 2/3 EtherSwitch Service Module. Cisco Bug IDs: CSCvd48893.
CVSS v2 Base Score: 10.0 (AV:N/AC:L/Au:N/C:C/I:C/A:C)

ID: CVE-2017-5638
Title: Apache Struts2 Input Validation Code Execution Vulnerability
Vendor: Apache
Description: The Jakarta Multipart parser in Apache Struts 2 2.3.x before 2.3.32 and 2.5.x before mishandles file upload, which allows remote attackers to execute arbitrary commands via a #cmd= string in a crafted Content-Type HTTP header, as exploited in the wild in March 2017.
CVSS v2 Base Score: 10.0 (AV:N/AC:L/Au:N/C:C/I:C/A:C)

ID: CVE-2016-7892
Title: Adobe Flash Player Use-After-Free Code Execution Vulnerability
Vendor: Adobe
Description: Remote exploitation of a use-after-free vulnerability in Adobe's Flash Player could allow attackers to execute arbitrary code. Adobe is aware of a report that an exploit for CVE-2016-7892 exists in the wild, and is being used in limited targeted attacks.
CVSS v2 Base Score: 9.3 (AV:N/AC:M/Au:N/C:C/I:C/A:C)



SHA 256: c3e530cc005583b47322b6649ddc0dab1b64bcf22b124a492606763c52fb048f
MD5: e2ea315d9a83e7577053f52c974f6a5a
VirusTotal: https://www.virustotal.com/file/c3e530cc005583b47322b6649ddc0dab1b64bcf22b124a492606763c52fb048f/analysis/#additional-info
Typical Filename: Tempmf582901854.exe
Claimed Product: (unknown)
Detection Name: W32.C3E530CC00-95.SBX.TG

SHA 256: c68a81b249dbddc80db05d92b065462fe90365a5ab2d3c9cc47bb99c90cce3cc
MD5: d5ef36d2c72d29fa85e4669e7b500c30
VirusTotal: https://www.virustotal.com/file/c68a81b249dbddc80db05d92b065462fe90365a5ab2d3c9cc47bb99c90cce3cc/analysis/#additional-info
Typical Filename: beef-xss
Claimed Product: Browser Exploitation Framework
Detection Name: W32.Auto.c68a81.201444.in01

SHA 256: 4ce5366c7eef1fff1260d5d7a0aec72c1246621838bf8df07f4a6ab3e5369d96
MD5: 517d9598ac8aa0ef0cb7145ffd64805e
VirusTotal: https://www.virustotal.com/file/4ce5366c7eef1fff1260d5d7a0aec72c1246621838bf8df07f4a6ab3e5369d96/analysis/#additional-info
Typical Filename: Invoice 7983.doc
Claimed Product: N/A
Detection Name: W32.4CE5366C7E-100.SBX.TG

SHA 256: 87afd627b678da78d879dfe11c147b10f5db6e07cd16e5728ca33579e73bf89f
MD5: 515ea84f7ca8f59f7bb4fb5714913a72
VirusTotal: https://www.virustotal.com/file/87afd627b678da78d879dfe11c147b10f5db6e07cd16e5728ca33579e73bf89f/analysis/#additional-info
Typical Filename: helperamc.zip
Claimed Product: Advanced Mac Cleaner
Detection Name: W32.87AFD627B6-95.SBX.TG

SHA 256: 776cb4ad45dbf96d532a8bb142bc0d5446fd63994f039bcf22263a9e32c70958
MD5: 43cebda7f432f89b5ca6e9bd1c1a93b6
VirusTotal: https://www.virustotal.com/file/776cb4ad45dbf96d532a8bb142bc0d5446fd63994f039bcf22263a9e32c70958/analysis/#additional-info
Typical Filename: radio-int.gif
Claimed Product: N/A
Detection Name: Auto.776CB4AD45.in04.Talos


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