isc.sans.eduSANS Internet Storm Center
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Isc.sans.edu is a subdomain of Sans.edu, which was created on 2005-12-02,making it 18 years ago.
Description：SANS Internet Storm Center. Today's Top Story: Exposed Azure Storage...
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| HomePage size: 30.215 KB |
| Page Load Time: 0.088723 Seconds |
| Website IP Address: 45.60.31.34 |
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isc.sans.edu Httpheader
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| Date: Sun, 09 May 2021 08:03:52 GMT |
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| Server: nc -l -p 80 |
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| content="SANS Internet Storm Center. Today's Top Story: Exposed Azure Storage Containers;" name="description"/ |
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isc.sans.edu Ip Information
| Ip Country: United States |
| Latitude: 37.751 |
| Longitude: -97.822 |
isc.sans.edu Html To Plain Text
Threat Level: green Handler on Duty: Guy Bruneau SANS ISC: SANS Site Network Current Site Other SANS Sites Help Graduate Degree Programs Security Training Security Certification Security Awareness Training Penetration Testing Industrial Control Systems Cyber Defense Foundations DFIR Software Security Government OnSite Training Sign Up for Free! Forgot Password? Log In or Sign Up for Free ! Last Daily Podcast (Fri, May 7th): Azure Blob Scans; Qualcomm MSM Vuln.; Google 2SF Default; Celebrite UFED Patch Latest Diaries Exposed Azure Storage Containers Published : 2021-05-07 Last Updated : 2021-05-07 00:02:16 UTC by Daniel Wesemann (Version: 1) 1 comment(s) A couple months ago, we already covered the topic of exposed Azure Blob Storage in two separate ISC diaries, " Exposed Blob Storage in Azure " and " Preventing Exposed Blob Storage in Azure ". The information therein is still relevant and valid, so if you are using Azure Storage, and haven’t read these two diaries yet, please do. There is no doubt that having an Azure Storage Container that is shared publicly at level "Container" is usually a bad idea, because everyone who knows the Container name can then trivially enumerate the contents, by simply tucking a /?comp=list&restype=container onto the URL. But the container names themselves cannot be enumerated quite as easily, so some users of Azure Storage seem to feel safe-ish behind this layer of obscurity. But recently, we noticed a significant uptick in attempts to blindly enumerate existing storage containers. You can think of it as a dictionary attack of sorts, because the log files show the bad guys sequentially probing storageaccount.blob.core.windows.net/backup storageaccount.blob.core.windows.net/backups storageaccount.blob.core.windows.net/test storageaccount.blob.core.windows.net/data [...] etc, you get the drift. The question is, how does this work? How do the attackers even distinguish between a Container that doesn’t exist at all, and one that does exist, but has access restrictions set to "Blob"? Well, here is how: See it? "Blob not found" versus "Resource not found". This tells us that the container "/files/" exists, whereas "/othercontainer/" doesn’t. We could call this an example of CWE-209 https://cwe.mitre.org/data/definitions/209.html aka "Error Message Containing Sensitive Information". It is similar to a lesson learned two decades ago when error messages were distinguishing between "login incorrect" and "password incorrect" and indirectly facilitated brute-force breakin attempts by allowing an attacker to more readily identify valid accounts. As a "countermeasure", you can Stop any public access by making your Storage Account "private". This should be the default, and is the only safe option. Refer to the two mentioned earlier diaries on how to do so, and how to implement prevention that works. If a Storage Account is set to "Private", the response will always be "Resource Not Found", irrespective of whether the attempt hits an existing container name or not. If you "have" to keep something shared at Blob level, maybe consider increasing the obscurity and smoke screen. Don’t call your container "backup" or "data" or the like, call it "akreiqfasvkkakdff" or some such. While this doesn’t really secure your data and only kicks the can down the obscurity road, it still makes it less likely that a brute force enumeration attempt will quickly find your container. Keep your eye on the new Azure Security Center alert titled "PREVIEW - Anonymous scan of public storage containers" ( Azure Alerts Reference ) that politely warns you whenever someone tries to enumerate containers in your storage account. Here’s an example of how this new "PREVIEW" alert looks like. Note the terms that were included in this particular enumeration attempt. If your Container shared at level "Blob" happens to be called one of these names, assume that it already has been "found". Keywords: Azure brute force brute forcing cloud Storage 1 comment(s) Join us at SANS! Attend with Daniel Wesemann in starting If you have more information or corrections regarding our diary, please share . 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This Registry database contains ONLY .EDU domains. The data in the EDUCAUSE Whois database is provided by EDUCAUSE for information purposes in order to assist in the process of obtaining information about or related to .edu domain registration records. The EDUCAUSE Whois database is authoritative for the .EDU domain. A Web interface for the .EDU EDUCAUSE Whois Server is available at: http://whois.educause.edu By submitting a Whois query, you agree that this information will not be used to allow, enable, or otherwise support the transmission of unsolicited commercial advertising or solicitations via e-mail. The use of electronic processes to harvest information from this server is generally prohibited except as reasonably necessary to register or modify .edu domain names. Domain Name: SANS.EDU The Escal Institute for Advanced Technologies, Inc./dba SANS Institute 8120 Woodmont Ave Suite 310 Bethesda, MD 20814 USA Domain Admin The Escal Institute for Advanced Technologies, Inc./dba SANS Institute 8120 Woodmont Ave Suite 310 Bethesda, MD 20814 USA +1.13019510102108 domains@sans.org David Turley The Escal Institute for Advanced Technologies 11200 Rockville Pike Suite 200 North Bethesda, MD 20852 USA +1.3012290777 domains@sans.org NS-1611.AWSDNS-09.CO.UK NS-745.AWSDNS-29.NET NS-363.AWSDNS-45.COM NS-1058.AWSDNS-04.ORG Domain record activated: 02-Dec-2005 Domain record last updated: 01-Sep-2022 Domain expires: 31-Jul-2024