Attacks abuse Microsoft DHCP to spoof DNS records and steal secrets
Attacks abuse Microsoft DHCP to spoof DNS records and steal secrets
Akamai says it reported the flaws to Microsoft. Redmond shrugged
I hate to be that guy, but the documentation for AD DHCP goes over this.
It isn't always Microsoft's fault when they fail to save their customers from their own stupidity and lack of concern for security.
It is bad that this is the default behavior, but defaults aren't always defaults because they are the best, they are the defaults that will all work functionally together as long as everything is at default settings.
It is more about making it "work out of the box" with defaults than "making sure it is secure out of the box."
Frankly, the security of their AD DHCP/DNS is the job of the SysAdmin, not Microsoft. A SysAdmin is supposed to be a professional, so why do they want to blame a third party for their own shortcomings and lack of security conscientiousness?
Nobody is blaming Linus for badly secured Linux servers, or saying the defaults should be more secure.
I am going to blame Microsoft, because “works out of the box” shouldn't conflict with “secure out of the box.”
And while I won't blame Linus for insecure-by-default Linux configs, I will blame whoever integrated the distro/dockerfile/etc.
This is the best summary I could come up with:
In addition to detailing the security issue, the cloud services biz also provided a tool that sysadmins can use to detect configurations that are at risk.
While the current report doesn't provide technical details or proof-of-concept exploits, Akamai has promised, in the near future, to publish code that implements these attacks called DDSpoof - short for DHCP DNS Spoof.
"We will show how unauthenticated attackers can collect necessary data from DHCP servers, identify vulnerable DNS records, overwrite them, and use that ability to compromise AD domains," Akamai security researcher Ori David said.
The DHCP attack research builds on earlier work by NETSPI's Kevin Roberton, who detailed ways to exploit flaws in DNS zones.
In addition to abusing Microsoft's DHCP to create or overwrite DNS records, the team found another feature, DNSUpdateProxy group, that also poses a security risk - and potentially contains a bug.
But in the meantime, we'd suggest following Akamai's advice and disable DHCP DNS Dynamic Updates if you don't already and avoid DNSUpdateProxy altogether.
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