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Angling for Silverlight Exploits

VRT / TRACThis post is co-authored by Andrew Tsonchev, Jaeson Schultz, Alex Chiu, Seth Hanford, Craig Williams, Steven Poulson, and Joel Esler. Special thanks to co-author Brandon Stultz for the exploit reverse engineering. 

Silverlight exploits are the drive-by flavor of the month. Exploit Kit (EK) owners are adding Silverlight to their update releases, and since April 23rd we have observed substantial traffic (often from Malvertising) being driven to Angler instances partially using Silverlight exploits. In fact in this particular Angler campaign, the attack is more specifically targeted at Flash and Silverlight vulnerabilities and though Java is available and an included reference in the original attack landing pages, it’s never triggered.

Rise in Angler Attacks

HTTP requests for a specific Angler Exploit Kit campaign

Exploit Content Type

Angler exploit content types delivered to victims, application/x-gzip (Java) is notably absent

 

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OpenSSL Heartbleed vulnerability CVE-2014-0160 – Cisco products and mitigations

*** UPDATED 15-April 2014  ***

By now, almost everyone has heard of the OpenSSL Heartbleed vulnerability with CVE id CVE-2014-0160. The vulnerability has to do with the implementation of the TLS heartbeat extension (RFC6520) and could allow secret key or private information leakage in TLS encrypted communications. For more detailed information, visit the VRT’s analysis.

Cisco maintains an Cisco Event Response Page with details and network mitigations about the vulnerability

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T-7: The Bundle Countdown Begins…

It’s that time of year again—the Cisco IOS Software Security Advisory Bundled Publication will go live in seven days. As a reminder, the Cisco Product Security Incident Response Team (PSIRT) releases bundles of Cisco IOS Software Security Advisories on the fourth Wednesday of March and September each calendar year. As is the case with the vast majority of our advisories, vulnerabilities scheduled for disclosure in these upcoming Security Advisories will normally have a Common Vulnerability Scoring System (CVSS) Base Score from 7.0 to 10.0.

To ensure you’re prepared for the upcoming publication, consider:

  • Creating a text file of all the Cisco IOS Software releases in your network
  • Assembling a simple list of Cisco IOS Software technologies and features you use
  • Noting your Cisco.com username and password
  • Locating the username and password for your Cisco IOS routers and switches
  • Ensuring network operation partners are prepared for the security advisory release
  • Reviewing the benefits of OVAL and CVRF content

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Fiesta Exploit Pack is No Party for Drive-By Victims

This post was also authored by Andrew Tsonchev and Steven Poulson.

TRAC-tank-vertical_logo

Update 2014-05-26Thank you to Fox-IT for providing the Fiesta logo image. We updated the caption to accurately reflect image attribution.

Cisco’s Cloud Web Security (CWS) service provides TRAC researchers with a constant fire hose of malicious insight and now that we are collaborating with Sourcefire’s Vulnerability Research Team (VRT) we have additional capabilities to quickly isolate and prioritize specific web exploit activity for further analysis. Thus when we were recently alerted to an aggressive Fiesta exploit pack (EP) campaign targeting our customers, we quickly compared notes and found that in addition to the typical Java exploits, this EP was also using a Microsoft Silverlight exploit. In the Cisco 2014 Annual Security Report (ASR) we discuss how 2013 was a banner year for Java exploits, and while updating Java should remain a top priority, Silverlight is certainly worth patching as threat actors continue to search for new application exploits to leverage in drive-by attacks.

Fiesta Exploit Pack

Image provided courtesy of Fox-IT

Over the past 30 days this specific Fiesta campaign was blocked across more than 300 different companies. The attacker(s) used numerous dynamic DNS (DDNS) domains -- that resolved to six different IP addresses -- as exploit landing pages. The chart below depicts the distribution of hosts used in this attack across the most blocked DDNS base domains.

CWS Fiesta Blocks by Distinct Requests

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A Culture of Transparency

Many Cisco customers with an interest in product security are aware of our security advisories and other publications issued by our Product Security Incident Response Team (PSIRT). That awareness is probably more acute than usual following the recent Cisco IOS Software Security Advisory Bundled Publication on September 25. But many may not be aware of the reasoning behind why, when, and how Cisco airs its “dirty laundry.”

Our primary reason for disclosing vulnerabilities is to ensure customers are able to accurately assess, mitigate, and remediate the risk our vulnerabilities may pose to the security of their networks.

In order to deliver on that promise, Cisco has has made some fundamental and formative decisions that we’ve carried forward since our first security advisory in June 1995.

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