Microsoft heeft op 13 oktober 2020 updates uitgebracht voor verschillende beveiligingsproblemen. Voor het eerst in zeven maanden worden er minder dan 100 CVE’s gepatched. Twee van deze beveiligingsproblemen zijn gerelateerd aan IPv6 en zijn door het securityteam van Microsoft zelf geïdentificeerd.
Het betreft hier de volgende kwetsbaarheden:
CVE-2020-16898 | Windows TCP/IP Remote Code Execution Vulnerability (severity Critical)
CVE-2020-16899 | Windows TCP/IP Denial of Service Vulnerability (severity Important)
Beide kwetsbaarheden zijn theoretisch te exploiteren met een (multicast) ICMPv6 Router Advertisement (RA). Routers kondigden normaal gesproken hiermee hun aanwezigheid in het netwerk aan. Dit wordt gebruikt voor het Neighbor Discovery Protocol (NDP). NDP kan ook worden ingezet voor het uitvoeren van netwerk aanvallen waardoor bijvoorbeeld een man-in-the-middle positie verkregen kan worden. In de netwerkinfrastructuur kunnen echter maatregelen worden getroffen om dit te voorkomen.
Volgens informatie van McAfee Advanced Threat Research betreft de DoS kwetsbaarheid een out-of-bounds read waardoor een Blue Screen of Death (BSoD) kan optreden. Hiervoor wordt een RA met een geprepareerde DNS Search List (DNSSL) option gebruikt.
#BadNeighbor is here! This is what we nicknamed the Microsoft Windows critical and wormable RCE vuln, CVE-2020-16898. McAfee ATR has released brief analysis and a Suricata rule for those unable to patch. https://t.co/XaocOyIv1thttps://t.co/Zo8PEKUEkz#atr #badneighbor #mcafee
— Steve Povolny (@spovolny) October 13, 2020
De RCE-kwetsbaarheid kan worden geëxploiteerd door een RA te sturen met een geprepareerde Recursive DNS Server (RDNSS) option. Gelukkig zijn er door Microsoft verschillende beveiligingsmaatregelen getroffen (zoals ASLR) waardoor succesvolle exploitatie niet eenvoudig is.
Wormable
Als de aanwezige beveiligingsmaatregelen kunnen worden omzeild, dan bestaat de mogelijkheid dat deze kwetsbaarheid kan worden gebruikt voor de automatische verspreiding van malware zonder gebruikersinteractie.
Workaround
Microsoft heeft naast updates ook workarounds gepubliceerd. Deze kunnen echter problemen veroorzaken in IPv6 netwerken.
Access42 is van mening dat de inzet van maatregelen in de netwerkinfrastructuur (RA snooping) een betere workaround is. Het gebruik hiervan is sowieso aan te bevelen.
Aanvalsoppervlak
Een ICMPv6 Router Advertisement hoort niet over het internet te kunnen propageren. Het aanvalsoppervlak is hierdoor enigszins beperkt.
Cookie | Duur | Omschrijving |
---|---|---|
_GRECAPTCHA | 5 months 27 days | This cookie is set by Google. In addition to certain standard Google cookies, reCAPTCHA sets a necessary cookie (_GRECAPTCHA) when executed for the purpose of providing its risk analysis. |
cookielawinfo-checkbox-advertisement | 1 year | The cookie is set by GDPR cookie consent to record the user consent for the cookies in the category "Advertisement". |
cookielawinfo-checkbox-analytics | 11 months | This cookie is set by GDPR Cookie Consent plugin. The cookie is used to store the user consent for the cookies in the category "Analytics". |
cookielawinfo-checkbox-functional | 11 months | The cookie is set by GDPR cookie consent to record the user consent for the cookies in the category "Functional". |
cookielawinfo-checkbox-necessary | 11 months | This cookie is set by GDPR Cookie Consent plugin. The cookies is used to store the user consent for the cookies in the category "Necessary". |
cookielawinfo-checkbox-others | 11 months | This cookie is set by GDPR Cookie Consent plugin. The cookie is used to store the user consent for the cookies in the category "Other. |
cookielawinfo-checkbox-performance | 11 months | This cookie is set by GDPR Cookie Consent plugin. The cookie is used to store the user consent for the cookies in the category "Performance". |
CookieLawInfoConsent | 1 year | Records the default button state of the corresponding category & the status of CCPA. It works only in coordination with the primary cookie. |
viewed_cookie_policy | 11 months | The cookie is set by the GDPR Cookie Consent plugin and is used to store whether or not user has consented to the use of cookies. It does not store any personal data. |
Cookie | Duur | Omschrijving |
---|---|---|
bcookie | 2 years | This cookie is set by linkedIn. The purpose of the cookie is to enable LinkedIn functionalities on the page. |
lang | session | This cookie is used to store the language preferences of a user to serve up content in that stored language the next time user visit the website. |
lidc | 1 day | This cookie is set by LinkedIn and used for routing. |
Cookie | Duur | Omschrijving |
---|---|---|
YSC | session | This cookies is set by Youtube and is used to track the views of embedded videos. |
Cookie | Duur | Omschrijving |
---|---|---|
_ga | 2 years | This cookie is installed by Google Analytics. The cookie is used to calculate visitor, session, campaign data and keep track of site usage for the site's analytics report. The cookies store information anonymously and assign a randomly generated number to identify unique visitors. |
_gat_gtag_UA_116473530_1 | 1 minute | This cookie is set by Google and is used to distinguish users. |
_gat_UA-116473530-1 | 1 minute | This is a pattern type cookie set by Google Analytics, where the pattern element on the name contains the unique identity number of the account or website it relates to. It appears to be a variation of the _gat cookie which is used to limit the amount of data recorded by Google on high traffic volume websites. |
_gid | 1 day | This cookie is installed by Google Analytics. The cookie is used to store information of how visitors use a website and helps in creating an analytics report of how the website is doing. The data collected including the number visitors, the source where they have come from, and the pages visted in an anonymous form. |
Cookie | Duur | Omschrijving |
---|---|---|
bscookie | 2 years | This cookie is a browser ID cookie set by Linked share Buttons and ad tags. |
IDE | 1 year 24 days | Used by Google DoubleClick and stores information about how the user uses the website and any other advertisement before visiting the website. This is used to present users with ads that are relevant to them according to the user profile. |
prism_476809757 | 1 month | Used by ActiveCampaign to track usage of newsletters |
test_cookie | 15 minutes | This cookie is set by doubleclick.net. The purpose of the cookie is to determine if the user's browser supports cookies. |
VISITOR_INFO1_LIVE | 5 months 27 days | This cookie is set by Youtube. Used to track the information of the embedded YouTube videos on a website. |
yt-remote-connected-devices | never | YouTube sets this cookie to store the video preferences of the user using embedded YouTube video. |
yt-remote-device-id | never | YouTube sets this cookie to store the video preferences of the user using embedded YouTube video. |
Cookie | Duur | Omschrijving |
---|---|---|
AnalyticsSyncHistory | 1 month | No description |
CONSENT | 16 years 7 months 5 days 13 hours | No description |
li_gc | 2 years | No description |
UserMatchHistory | 1 month | Linkedin - Used to track visitors on multiple websites, in order to present relevant advertisement based on the visitor's preferences. |