Looking at our patch Tuesday list, I looked a bit closer at CE-2020-1048 (Print Spooler Privilege Escalation) and Microsoft's ratings for that one. Microsoft rated this as:
Unfortunately, this vulnerabiltiy was actually disclosed to Microsoft by the research community (see below), so the code to exploit it absolutely does exist and was disclosed, and a full write-up was posted as soon as the patch came out:
Long story short, on an unpatched system, you can plant a persistent backdoor on a target host with this one-liner in PowerShell:
As noted, this backdoor is persistent, and will remain in place even after you apply the patch!
Moral of the story? For me, there are a couple of them:
Anymore, if you see resistence to resolving any security issues in your organization (even lows and mediums), my take would be to tackle this in your Corporate Policies. To help to ensure that any security issues are resolved - whether via patching or correcting a config issue, have your policy call for a formal sign-off for the decision to NOT fix each of those issues. You'll find that management will be reluctant to put in writing "we're choosing to not fix this problem".
Kudos to @peleghd (Peleg Hadar) and Tomer Bar of @safebreach for the initial research and disclosure to Microsoft (acknowledgements here: https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1048 ).
May 14th 2020
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May 14th 2020
11 months ago