Threat Intelligence

6/7/2018
03:05 PM
Connect Directly
Twitter
LinkedIn
Google+
RSS
E-Mail
50%
50%

Adobe Issues Emergency Patch for Flash Zero-Day

Adobe has patched four security vulnerabilities today, including a zero-day being actively exploited in the wild.

Adobe has released security updates to patch vulnerabilities in Adobe Flash Player for Windows, Mac, Linux, and Chrome OS. The fixes for CVE-2018-4945, CVE-2018-5000, CVE-2018-5001, and CVE-2018-5002 all address critical vulnerabilities in version 29.0.0.171 and earlier.

CVE-2018-4945, a type confusion vulnerability, and CVE-2018-5002, a stack-based buffer overflow vulnerability, both enable arbitrary code execution. CVE-2018-5000 and CVE-2018-5001 enable information disclosure. All are patched in Adobe Flash version 30.0.0.113.

CVE-2018-5002 was discovered being used in limited, targeted attacks on Windows users in the wild, Adobe reports. The exploit uses an Office document to download and execute an Adobe Flash exploit to target machines, according to the Icebrg Security Research Team, one of a few organizations to independently identify and report the vulnerability to Adobe.

Attacks arrive as emails with attached Microsoft Office documents containing embedded malicious Flash Player content. The attack loads Adobe Flash from within Microsoft Office, a common approach to Flash exploitation since most people have Flash disabled in the browser. An embedded Flash file in the document might contain the full exploit or set the stage for the attack to selectively download exploits and payloads.

Unlike similar attacks, this one uses the lesser-known tactic of remotely including Flash content instead of embedding it within the document, Icebrg researchers explain. This means the document does not contain malicious code and therefore won't raise any red flags. Further, because attackers can choose which exploits to use on a recipient, they can choose their victims.

Researchers suggest the attack might be targeting victims in Qatar, a finding based on the weaponized document, which is written in Arabic and appears to contain information on salary changes. The file was uploaded to VirusTotal from an IP address in Qatar earlier this year, and many of the job titles specifically refer to secretaries, ambassadors, and diplomats.

Icebrg points to a few key indicators that could suggest a machine is under attack. Alone, these might not indicate a threat, but multiple indicators could suggest malicious activity. Signs include the use of newly registered domains and low-reputation infrastructure (they use provider Abelons as an example), staged downloads of Flash, a newly observed "Let's Encrypt" certificate from a free provider, and Office documents embedding Flash using remote inclusion.

Microsoft published security advisory notification 180014 and released an update in response to the fixes. US-CERT also issued an advisory on Adobe's security updates. The National Cybersecurity and Communications Integration Center (NCCIC) advises users and administrators to review Adobe's security advisory and apply all necessary updates.

CVE-2018-5002 was independently reported by Icebrg.io, members of 350 Threat Intelligence Center at 360 Enterprise Security Group, and members of the Qihoo 360 Core Security Group. CVE-2018-4945 was discovered by experts at Tencent KeenLab and Trend Microsoft's Zero Day Initiative. CVE-2018-5000 and CVE-2018-5001 were both reported via Trend Micro's ZDI.

Related Content:

 

Top industry experts will offer a range of information and insight on who the bad guys are – and why they might be targeting your enterprise. Click for more information

Kelly Sheridan is the Staff Editor at Dark Reading, where she focuses on cybersecurity news and analysis. She is a business technology journalist who previously reported for InformationWeek, where she covered Microsoft, and Insurance & Technology, where she covered financial ... View Full Bio

Comment  | 
Print  | 
More Insights
Comments
Newest First  |  Oldest First  |  Threaded View
Election Websites, Back-End Systems Most at Risk of Cyberattack in Midterms
Kelly Jackson Higgins, Executive Editor at Dark Reading,  8/14/2018
Register for Dark Reading Newsletters
White Papers
Video
Cartoon Contest
Current Issue
Flash Poll
Twitter Feed
Dark Reading - Bug Report
Bug Report
Enterprise Vulnerabilities
From DHS/US-CERT's National Vulnerability Database
CVE-2017-13106
PUBLISHED: 2018-08-15
Cheetahmobile CM Launcher 3D - Theme, wallpaper, Secure, Efficient, 5.0.3, 2017-09-19, Android application uses a hard-coded key for encryption. Data stored using this key can be decrypted by anyone able to access this key.
CVE-2017-13107
PUBLISHED: 2018-08-15
Live.me - live stream video chat, 3.7.20, 2017-11-06, Android application uses a hard-coded key for encryption. Data stored using this key can be decrypted by anyone able to access this key.
CVE-2017-13108
PUBLISHED: 2018-08-15
DFNDR Security Antivirus, Anti-hacking & Cleaner, 5.0.9, 2017-11-01, Android application uses a hard-coded key for encryption. Data stored using this key can be decrypted by anyone able to access this key.
CVE-2017-13100
PUBLISHED: 2018-08-15
DistinctDev, Inc., The Moron Test, 6.3.1, 2017-05-04, iOS application uses a hard-coded key for encryption. Data stored using this key can be decrypted by anyone able to access this key.
CVE-2017-13101
PUBLISHED: 2018-08-15
Musical.ly Inc., musical.ly - your video social network, 6.1.6, 2017-10-03, iOS application uses a hard-coded key for encryption. Data stored using this key can be decrypted by anyone able to access this key.