Very Low
CVE-2021-24094
CVE-2021-24094
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Technical Analysis
This remains a spectacularly new vulnerability with little documentation associated with it beyond Microsoft’s blog here: https://msrc-blog.microsoft.com/2021/02/09/multiple-security-updates-affecting-tcp-ip/
In the blog, this is a remote code execution vulnerability reported as associated with IPv6 packet reassembly. According to the vulnerability report here: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-24094, there is a patch, and you can create a firewall rule on Windows host-based firewalls to block an attack with the command Netsh int ipv6 set global reassemblylimit=0 to block packet reassembly. THIS MAY AFFECT SOME NETWORK TRAFFIC.
A second denial of service vulnerability (CVE-2021-24086) also associated with IPv6 fragment reassembly is mitigated with the same command.
As pure speculation, this vulnerability might be associated with memory corruption through improper length reporting, such that when packets are reassembled in memory, they are placed in a buffer of insufficient size to store them. Should that be the case, this would most likely be a heap vulnerability, and like other heap vulnerabilities before it like eternalblue, bluekeep, and dejablue, it will be a real pain to get to work on a regular basis or as a worm-able exploit.
CVSS V3 Severity and Metrics
General Information
Vendors
- microsoft
Products
- windows 10 -,
- windows 10 1607,
- windows 10 1803,
- windows 10 1809,
- windows 10 1909,
- windows 10 2004,
- windows 10 20h2,
- windows 7 -,
- windows 8.1 -,
- windows rt 8.1 -,
- windows server 2008 -,
- windows server 2008 r2,
- windows server 2012 -,
- windows server 2012 r2,
- windows server 2016 -,
- windows server 2016 1909,
- windows server 2016 2004,
- windows server 2016 20h2,
- windows server 2019 -
