(c) SANS Internet Storm Center. http://isc.sans.edu Creative Commons Attribution-Noncommercial 3.0 United States License.

Brett, who operates an ISP in Wyoming, notified us that he had a number of customers with compromissed Linksys routers these last couple of days. The routers, once compromissed, scan port 80 and 8080 as fast as they can (saturating bandwidth available). 

It is not clear which vulnerability is being exploited, but Brett eliminated weak passwords. E1200 routers with the latest firmware (2.0.06) appear to be immune agains the exploit used. E1000 routers are end-of-life and don't appear to have an immune firmware available.

As indicators, look for E1000/1200 routers which scan IP addresses sequentially on port 80/8080. Some of the routers may have modified DNS settings to point to Google's DNS server ( or 

If you have any insight, please let us know.

Johannes B. Ullrich, Ph.D.
SANS Technology Institute

(c) SANS Internet Storm Center. http://isc.sans.edu Creative Commons Attribution-Noncommercial 3.0 United States License.

Mt. Gox, Bitstamp, and other Bitcoin exchanges have temporarily suspended withdrawal transactions after coming under a form of a denial-of-service attack that abuses weaknesses in the way they keep track of fund balances, a security expert said.

The attacks don't have any permanent effect on the central accounting mechanism for the digital currency, but they are likely the driving force behind a sharp decline in the bitcoin-to-dollar exchange rate over the past 48 hours. Since the attacks began on Monday, the price of one bitcoin on Mt. Gox has fallen from just below $700 to well below $540 at one point. It has see-sawed ever since and was at about $580 as this report was being prepared. Other exchanges showed similar fluctuations.

Andreas M. Antonopoulos, chief security officer of digital wallet developer Blockchain, said the attacks work by flooding exchanges with a large number of malformed transactions that are similar, but not identical, to legitimate transactions that were already made. Exchanges that trust one or more of the fake records instead of the entries in the official Bitcoin blockchain quickly fall out of sync with the rest of the network and must recalculate their fund balances once the mistakes become apparent. Malformed transactions aren't necessarily new, but over the past 48 hours their numbers have mushroomed, causing logjams that have prevented some exchanges from being able to process withdrawal requests.

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A workshop aimed at improving federal cryptographic key management systems will be held at the National Institute of Standards and Technology (NIST)aposs Gaithersburg, Md., campus on March 4-5, 2014. The workshop will focus on discussing ...
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Overview of the February 2014 Microsoft patches and their status.


# Affected Contra Indications - KB Known Exploits Microsoft rating(**) ISC rating(*)
clients servers
MS14-005 Information Disclosure Vulnerability in Microsoft XML Code Services
(ReplacesMS10-051 )
Microsoft XML Core Services
KB 2916036 Yes. Severity:Important
Exploitability: 3
Important Important
MS14-006 IPv6 Denial of Service
(ReplacesMS13-065 )
TCP/IP Stack (IPv6)
KB 2904659 Yes. (vuln. known) Severity:Important
Exploitability: 3
Important Important
MS14-007 Remote Code Execution in Direct2D
(Replaces )
KB 2912390 No. Severity:Critical
Exploitability: 1
Critical Important
MS14-008 Allow Remote Code Execution in Microsoft Forefront
(Replaces )
Microsoft Forefront
KB 2927022 No. Severity:Critical
Exploitability: 1
N/A Critical
MS14-009 Elevation of Privilege Vulnerability in .Net Framework
(Replaces MS13-052, MS11-100 )
.Net Framework
KB 2916607 Yes. Severity:Important
Exploitability: 1
Important Important
MS14-010 Cumulative Security Update for Internet Explorer
(ReplacesMS13-097 )
Internet Explorer
KB 2909921 Yes
Exploitability: 1
PATCH NOW! Important
MS14-011 Remote Code Execution Vulnerability in VBScript Scripting
(Replaces MS10-022 )
KB 2928390 No. Severity:Critical
Exploitability: 1
Critical Critical
;"> We will update issues on this page for about a week or so as they evolve.
We appreciate updates
US based customers can call Microsoft for free patch related support on 1-866-PCSAFETY
(*): ISC rating
  • We use 4 levels:
    • PATCH NOW: Typically used where we see immediate danger of exploitation. Typical environments will want to deploy these patches ASAP. Workarounds are typically not accepted by users or are not possible. This rating is often used when typical deployments make it vulnerable and exploits are being used or easy to obtain or make.
    • Critical: Anything that needs little to become "interesting" for the dark side. Best approach is to test and deploy ASAP. Workarounds can give more time to test.
    • Important: Things where more testing and other measures can help.
    • Less Urgent: Typically we expect the impact if left unpatched to be not that big a deal in the short term. Do not forget them however.
  • The difference between the client and server rating is based on how you use the affected machine. We take into account the typical client and server deployment in the usage of the machine and the common measures people typically have in place already. Measures we presume are simple best practices for servers such as not using outlook, MSIE, word etc. to do traditional office or leisure work.
  • The rating is not a risk analysis as such. It is a rating of importance of the vulnerability and the perceived or even predicted threat for affected systems. The rating does not account for the number of affected systems there are. It is for an affected system in a typical worst-case role.
  • Only the organization itself is in a position to do a full risk analysis involving the presence (or lack of) affected systems, the actually implemented measures, the impact on their operation and the value of the assets involved.
  • All patches released by a vendor are important enough to have a close look if you use the affected systems. There is little incentive for vendors to publicize patches that do not have some form of risk to them.

(**): The exploitability rating we show is the worst of them all due to the too large number of ratings Microsoft assigns to some of the patches.

Johannes B. Ullrich, Ph.D.
SANS Technology Institute


(c) SANS Internet Storm Center. http://isc.sans.edu Creative Commons Attribution-Noncommercial 3.0 United States License.

Adobe released one patch today: APSB14-006 [1]. It addresses a vulnerablity in Shockwave Player.It does affect Windows and OS X. The current version is now . The update has a priority rating of "1" which implies that the vulnerability has been exploited in targeted attacks.


[1] http://helpx.adobe.com/security/products/shockwave/apsb14-06.html

Johannes B. Ullrich, Ph.D.
SANS Technology Institute

(c) SANS Internet Storm Center. http://isc.sans.edu Creative Commons Attribution-Noncommercial 3.0 United States License.
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The attack used Network Time Protocol (NTP) reflection, the same technique used in recent attacks against gaming sites by a group called DERP Trolling. NTP is used to synchronize the time settings on computers across the Internet. The attack made fraudulent synchronization requests to NTP servers that caused them to send a flood of replies back at the targeted sites.

Reflection attacks have been a mainstay of DDoS tools and botnets, but the use of NTP in such attacks is relatively new. Last year’s attack on Spamhaus, which previously set the record for the largest DDoS ever, used a Domain Name Service (DNS) protocol attack—a much more common approach that takes advantage of the Internet’s directory service, forging requests for DNS lookups from the intended target and sending them to scores of open DNS servers. The size of the traffic directed back at the target from these requests far exceeds the size of the requests sent to the DNS servers, which is why the technique is often called a DNS amplification attack.

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