Threat Level: green Handler on Duty: Xavier Mertens

SANS ISC: InfoSec Handlers Diary Blog - Internet Storm Center Diary 2018-11-20 InfoSec Handlers Diary Blog


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VMware Affected by Dell EMC Avamar Vulnerability

Published: 2018-11-20
Last Updated: 2018-11-20 21:59:45 UTC
by Xavier Mertens (Version: 1)
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VMware notified us that they released a new security bulletin[1] (rated as "critical") which affects vSphere Data Protection (VDP).

VDP is vulnerable because it is based on Dell EMC Avamar Virtual Edition. Multiple vulnerabilities have been disclosed today in this solution:

  • A remote code execution vulnerability (CVE-2018-11066): A remote unauthenticated attacker could potentially exploit this vulnerability to execute arbitrary commands on the server.
  • An open redirection vulnerability (CVE-2018-11067): A remote unauthenticated attacker could potentially exploit this vulnerability to redirect application users to arbitrary web URLs by tricking the victim users to click on maliciously crafted links. The vulnerability could be used to conduct phishing attacks that cause users to unknowingly visit malicious sites.

Patches are available for both products.

This is a perfect example of how a product 'A' can affect a product 'B' when technologies are reused across multiple solutions.

[1] https://www.vmware.com/security/advisories/VMSA-2018-0029.html
[2] https://seclists.org/fulldisclosure/2018/Nov/49

Xavier Mertens (@xme)
Senior ISC Handler - Freelance Cyber Security Consultant
PGP Key

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Querying DShield from Cortex

Published: 2018-11-20
Last Updated: 2018-11-20 13:40:22 UTC
by Xavier Mertens (Version: 2)
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Cortex is a tool part of the TheHive project[1]. As stated on the website, it is a "Powerful Observable Analysis Engine". Cortex can analyze observables like IP addresses, emails, hashes, filenames against a huge (and growing) list of online services. I like the naming convention used by Cortex. We have "observables" that can be switched later to an "IOC" later if they are really relevant for us. Keep in mind that an interesting IOC for you could be totally irrelevant in another environment.

What makes Cortex so powerful and convenient is the long list of "analysers" (that's how they call the plugins). Though those small pieces of code, you can, in one click, search for observables in many sources. Cortex is available through a web interface but its REST API makes it easy to interconnect with other tools to enrich the data. Two popular tools that can interact with Cortex are MISP[2] and TheHive[3]. From their web interface, I can easily enrich data using the following analyzers (they are enabled in my own instance of TheHive):

  • Abuse_Finder_2_0
  • CIRCLPassiveDNS_2_0
  • CIRCLPassiveSSL_2_0
  • Censys_1_0
  • Cymon_Check_IP_2_1
  • DShield_lookup_1_0
  • DomainTools_ReverseIP_2_0
  • DomainTools_ReverseNameServer_2_0
  • DomainTools_ReverseWhois_2_0
  • DomainTools_Risk_2_0
  • DomainTools_WhoisHistory_2_0
  • DomainTools_WhoisLookup_2_0
  • DomainTools_WhoisLookup_IP_2_0
  • EmlParser_1_0
  • FileInfo_3_0
  • Fortiguard_URLCategory_2_0
  • HybridAnalysis_GetReport_1_0
  • MISPWarningLists_1_0
  • MISP_2_0
  • MaxMind_GeoIP_3_0
  • Msg_Parser_2_0
  • OTXQuery_2_0
  • Onyphe_Forward_1_0
  • Onyphe_Geolocate_1_0
  • Onyphe_Ports_1_0
  • Onyphe_Reverse_1_0
  • Onyphe_Threats_1_0
  • PassiveTotal_Enrichment_2_0
  • PassiveTotal_Malware_2_0
  • PassiveTotal_Osint_2_0
  • PassiveTotal_Passive_Dns_2_0
  • PassiveTotal_Ssl_Certificate_Details_2_0
  • PassiveTotal_Ssl_Certificate_History_2_0
  • PassiveTotal_Unique_Resolutions_2_0
  • PassiveTotal_Whois_Details_2_0
  • Robtex_Forward_PDNS_Query_1_0
  • Robtex_IP_Query_1_0
  • Robtex_Reverse_PDNS_Query_1_0
  • Shodan_Host_1_0
  • Shodan_Search_1_0
  • URLhaus_1_0
  • VirusTotal_GetReport_3_0
  • VirusTotal_Scan_3_0
  • WOT_Lookup_1_0

Writing new analyzers is very simple, an API is provided and any language can be used (by most of them are written in Python). Some analyzers query open services, others query private services (you need an API) or commercial services (you need a subscription). As you can see, there is an analyzer called "DShield_lookup". That's my contribution to the project. From Cortex, MISP, TheHive, you can query our DShield database to get more information about an IP address:

When if you click on the DShield tag, you can more details:

The DShield analyzer has been added to the official repository by the developers a few weeks ago. Just deploy Cortex and enable it to benefit from our DShield database!

[1] https://thehive-project.org/#section_cortex
[2] http://misp-project.org/
[3] https://thehive-project.org/#section_thehive

Xavier Mertens (@xme)
Senior ISC Handler - Freelance Cyber Security Consultant
PGP Key

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