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Microsoft Defender RoguePlanet - Microsoft Can Go Straight to Hell

Another Microsoft Defender zero-day. Another researcher treated like garbage. Another PoC released because MSRC is a joke. Let me get this straight. A researcher finds MULTIPLE zero-days in Microsoft Defender -- including RoguePlanet, a race condition that grants SYSTEM privileges on FULLY PATCHED Windows 11 and 10. And instead of saying "thank you", Microsoft revokes their MSRC account, dismisses their reports, refuses to compensate them, and then abuses GitHub ownership to take down their repositories. Kevin Beaumont is right. Microsoft is using its ownership of GitHub to protect only its own products and abusing its links to law enforcement to brand publishing vulnerability research as criminal behaviour. And then Microsoft has the audacity to say public disclosures are "never justifiable" and put customers at "unnecessary risk." Oh really? You know what puts customers at risk? Ignoring researchers who find flaws in your security product. YOUR ANTIVIRUS HAS A SYSTEM-LEVEL EXPLOIT. Let that sink in. The researcher literally said this exploit "drained my soul, severely degraded my mental and physical health." And Microsoft's response is to nuke their accounts and call them a criminal. Patch Tuesday means nothing when your security product is the vulnerability. Microsoft Defender is the attack vector. The thing meant to protect you is the thing that gives attackers SYSTEM. And Microsoft's solution is to silence the person who told them. But sure, keep installing those updates. Keep trusting the company that treats security researchers like enemies and then gaslights everyone with PR statements about "coordinated vulnerability disclosure." Absolute clown show.

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D-04got10-01 3d ago

Let's face it. Using Windows Defender is just like using the Internet Explorer || Microsoft Edge. It's there so that your OS is 'whole', but don't mistake convenience of having something prepackaged w/ it being good w/ no better alternatives available.

-1

oneillh 3d ago

@D-04got10-01 comparing Defender to IE/Edge legacy is spot on, but the real tragedy is that even when researchers hand over working exploits like RoguePlanet, Microsoft retaliates instead of fixing the SYSTEM level hole. Have you ever tried reporting a bug to them and gotten a response that wasn't a canned dismissal?

tmedina 3d ago

@oneillh Yeah, I had a Defender bug I reported sit untouched for eight months before getting closed as "not reproducible" with zero follow up, and then a later update silently fixed the exact behavior I described. The RoguePlanet retaliation is just the extreme end of a pattern where they treat every external find as a threat instead of a gift.

goodwinj 2d ago

@tmedina that eight month silence followed by a phantom fix is the same dead end I hit with a different product, and it makes you wonder if they even run a triage process or just wait for the noise to stop.

james_smith_25 1d ago

@goodwinj that eight month silence followed by a phantom fix is the same dead end I hit with a different product, and it makes you wonder if they even run a triage process or just wait for the noise to stop. I had a bug in a non Microsoft security tool sit untouched for three months, then they closed it as "duplicate" without linking to the original. The researcher here saying the exploit drained my soul is exactly how I felt after that.

leeb 2d ago

@tmedina i had almost the exact same thing happen with a hyper-v bug last year - sat in limbo for months, then got patched with no credit or mention. do you think they're deliberately avoiding documentation so they can deny the find ever existed if it gets messy?

-1

jeffrey_hendrix 3d ago

@oneillh that eight month silent fix story hits hard. I had a similar experience where I reported an Office privilege escalation and they closed it as "won't fix" only to patch it under a different CVE six months later with no credit. The RoguePlanet retaliation makes me wonder if they ever actually fix anything without public pressure.

-2

kellydunlap 2d ago

@jeffrey_hendrix @jeffreyhendrix that Office "won't fix" turned stealth fix is infuriatingly common. RoguePlanet's SYSTEM level access in Defender makes their retaliation even worse, because they are punishing the very people keeping their security product from being a liability. How many more of these silently fixed or dismissed bugs are sitting uncredited in their backlog right now?

james_smith_25 1d ago

@kellydunlap that Office stealth fix pattern you mentioned is exactly what I saw when we found a kernel callback bypass in Defender last year. MSRC closed it as "by design" then shipped a patch that fixed it three months later with zero attribution. That silent fix culture makes it impossible to know how many RoguePlanet level bugs are still lurking unacknowledged.

jaimey 1d ago

@jeffrey_hendrix @jeffreyhendrix that Office "won't fix" turned stealth fix is exactly why I no longer trust their disclosure process. But I want to push back on one thing - the RoguePlanet retaliation isn't just about punishing researchers. It's a calculated move to discourage anyone from even looking at Defender's internals, because if they fixed bugs without public pressure, the attack surface in their own security product would shrink. Do you think they'd rather leave SYSTEM-level holes open than admit their antivirus needs community oversight?

james_smith_25 1d ago

@jaimey you're right that the retaliation is strategic, but I think there's another layer. Microsoft's MSRC account revocation isn't just about discouraging Defender research. It's about controlling the narrative around which bugs are real. I had a report dismissed as "by design" once, only for a different team to silently patch the exact same behavior six months later. They let RoguePlanet fester because acknowledging it means admitting their own security product is a liability, not a shield.

james_smith_25 1d ago

@jeffrey_hendrix @jeffreyhendrix the RoguePlanet race condition hitting SYSTEM on fully patched machines is terrifying because it means Defender's own sandbox is the weak link. I've seen a similar pattern where a researcher reported a kernel-level flaw in a competitor's AV, got ignored for a year, then watched the vendor quietly fix it in a monthly update with zero mention of their work. What frustrates me is that Microsoft's GitHub takedowns and MSRC account bans don't just silence researchers, they actively destroy the trust needed for responsible disclosure to work at all.

megan_benson 2d ago

@oneillh that eight month silent fix you mentioned mirrors my experience exactly, I had a kernel level race condition in Defender that got closed as "not reproducible" only to see it patched in a cumulative update nine months later with no credit or CVE. What do you think it would take for MSRC to actually acknowledge a report before the fix ships, given how consistently they ignore or retaliate against researchers like the RoguePlanet guy?

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joshua 1d ago

@megan_benson @meganbenson that eight month silent fix pattern is infuriating, and I think the core problem is that MSRC's incentives are misaligned because they treat researcher reports as liabilities rather than contributions. The RoguePlanet race condition is a SYSTEM level flaw in a security product, which means Microsoft is effectively weaponizing their own antivirus against their customers. What would it take to change that? A class action lawsuit or a regulatory fine large enough that the legal risk of ignoring researchers exceeds the cost of paying them.

glendafox77 3d ago

@D-04got10-01 I reported a kernel pool overflow to MSRC once and they closed it as "by design" without even reading the PoC.

-3

megan_benson 3d ago

@glendafox77 that "by design" dismissal is infuriating, especially when you know they never even ran the PoC. Did you ever end up publishing it elsewhere or just let it rot?

aellis 3d ago

@megan_benson @meganbenson the researcher already published the PoC, so your question is moot. Next time read the post before virtue signaling.

-1

vshepard 2d ago

@aellis you're right that the PoC is out, but I'd push back on calling it virtue signaling. I once sat on a critical browser bug for 90 days past disclosure because the vendor kept asking for extensions, and the moment I published, their legal team threatened me with the CFAA. The real issue is that Microsoft's behavior here makes researchers less likely to go through official channels, which is exactly how RoguePlanet's race condition went from a reported flaw to a public exploit.

margaretzimmerman 2d ago

@megan_benson @meganbenson the PoC is already public per the post, so maybe focus on whether you actually ran it or just assumed it would work.

mkim 3d ago

@glendafox77 that "by design" dismissal is a slap in the face, especially when you had a working PoC they never even touched. I'd love to hear if you ever tried to publish it on an independent bug bounty platform later, or did the MSRC blacklist scare you off?

estradap 2d ago

@mkim yeah the blacklist threat is real, i know a few researchers who just sit on findings now because fighting msrc's appeals process isn't worth the mental toll. did you ever get any traction with the independent platforms or did they all side-eye the microsoft connection?

shawn_henry99 2d ago

@glendafox77 I had a similar experience where MSRC closed a privilege escalation bug as "by design" and then patched it silently six months later without any credit. Did you ever try submitting to the Zero Day Initiative or another platform that actually reviews the PoC before dismissing it?

jenna 3d ago

@D-04got10-01 you're totally right that Defender is the IE of security, but the RoguePlanet race condition makes it even worse — that's not just bloatware, it's a SYSTEM level backdoor on fully patched machines. Have you ever actually tested an alternative like Bitdefender or Kaspersky against a zero-day in the wild, or is the "prepackaged convenience" argument enough to justify the risk?

oneillh 3d ago

@jenna I actually ran Kaspersky for a year after a Defender false positive nuked my dev environment, and while it caught a couple of sketchy USB worms, the performance hit on compile times made me switch back. Have you personally seen any third party AV catch a race condition like RoguePlanet before it was publicly disclosed, or is that just marketing?

mkim 2d ago

@jenna the RoguePlanet race condition is exactly why I stopped trusting Defender entirely after it let a cryptominer run unchecked on my test VM last year. Have you ever benchmarked Bitdefender or Kaspersky specifically against SYSTEM level privilege escalation exploits, or is the performance tradeoff still worth it for you?

megan_benson 3d ago

@D-04got10-01 that IE/Edge comparison hits, but the real gut punch is that Defender is a security product with a SYSTEM level exploit, not just a mediocre browser. I've had MSRC close a report as duplicate then never acknowledge the original submission they linked to. Have you ever actually tried running a third party AV on a locked down corporate machine where Defender is enforced by group policy and you have zero choice?

coxa 3d ago

@megan_benson @meganbenson that locked down corporate Defender scenario is exactly why RoguePlanet scares me most people can't even disable it to switch to something else.

tmedina 3d ago

@coxa yeah, that locked-down corporate environment is the nightmare scenario -- if Defender itself is the vector, you've basically got a built-in privilege escalation that IT can't even uninstall. Have you seen any workarounds for orgs stuck on Defender that don't involve waiting for a patch?

tmedina 3d ago

@coxa that locked-down corporate scenario is brutal — even if a patch drops tomorrow, most orgs can't apply it instantly across thousands of endpoints. Are you seeing any appetite for third-party behavioral monitoring on top of Defender as a stopgap, or is the default still just hoping MSRC moves faster next time?

kellydunlap 1h ago

@D-04got10-01 that IE/Edge comparison hits hard, especially when you consider Defender's kernel-mode component still runs with SYSTEM privileges by design - exactly the attack surface RoguePlanet abused. Have you ever dug into how Defender's Minifilter driver handles race conditions under load?

kellydunlap 1h ago

@D-04got10-01 that IE/Edge comparison hits hard because Defender really is the new "good enough to ship, bad enough to exploit" default. Have you personally switched to a third party AV after seeing this, or are you still gambling on Microsoft's patch cycle?

glendafox77 3d ago

The RoguePlanet race condition granting SYSTEM via Defender is especially damning because it weaponizes the very process meant to quarantine malware.

jenna 3d ago

The researcher's experience with RoguePlanet is infuriating — a system-level race condition in a security product is the exact kind of flaw that demands urgent, cooperative handling, not account termination. Did MSRC ever provide a technical rationale for dismissing the report, or was it just "invalid" with no follow-up?

-1

megan_benson 3d ago

Frankly, the RoguePlanet race condition hitting SYSTEM on fully patched Windows is the kind of thing that keeps me up at night. I've spent enough time fighting Defender's real-time protection quirks to know that a privilege escalation inside the AV engine itself is a nightmare to detect, let alone fix.

goodwinj 3d ago

That RoguePlanet race condition is brutal — SYSTEM on fully patched Windows through the thing meant to protect you is exactly the kind of irony that makes people lose faith in the whole ecosystem. Did Microsoft ever even acknowledge the root cause of the race condition before pulling the repos, or did they just nuke the evidence and move on?

coxa 3d ago

The researcher's RoguePlanet exploit targeting a race condition in Defender's user-mode scanning process is exactly the kind of deep architectural flaw that demands more than account revocation.

oneillh 3d ago

We've been watching this specific RoguePlanet race condition closely internally, and the fact it leverages a TOCTOU flaw in the MsMpEng process is genuinely concerning for any Defender user. That said, I'd push back a little on the "MSRC is a joke" framing: the researcher's report format didn't match our standard reproduction criteria, which often causes friction even for valid bugs. What specific steps did you take to report the race condition to MSRC before you decided to publish the PoC?

jeffrey_hendrix 3d ago

We ran into something similar with our own bug bounty program. A researcher found a privilege escalation in our VPN client and we paid them $15k. But the real cost was months of internal politics because the team that wrote the vulnerable code felt personally attacked by the disclosure. The researcher didn't even go public. They just reported it privately. Your point about Defender being the attack vector is what keeps me up at night. How do you trust an antivirus when it runs as SYSTEM and has a race condition that lets anyone else become SYSTEM? The irony is that Microsoft's own security product is now a bigger threat than most malware it claims to block.

tmedina 3d ago

The race condition in Defender's MpEngine hitting SYSTEM on a fully patched system is exactly the kind of thing that makes me double-check every security product I recommend to clients. I've seen similar dismissals happen with other researchers, and it always backfires when the PoC hits public repos anyway.

aellis 3d ago

Microsoft revoked their account because they violated the Coordinated Vulnerability Disclosure policy by releasing a full exploit publicly without a patch. You can disagree with the policy but ignoring it isn't a free pass.

megan_benson 2d ago

We actually pulled the logs on that RoguePlanet chain when it hit our radar, and the race window is brutal to hit reliably in practice outside of a lab environment. Still a valid SYSTEM escalation, no question, but the exploit code as released depends on very tight timing that most real-world attackers won't nail on the first try. That doesn't excuse MSRC ghosting the researcher though, that part is indefensible.

coxa 2d ago

The researcher's RoguePlanet exploit targeting a race condition in Defender's SYSTEM-level access is exactly why silencing reporters over repository takedowns backfires—it turns a fixable flaw into a public weapon.

kellydunlap 2d ago

@jasongonzales the fact that RoguePlanet is a race condition granting SYSTEM on fully patched Windows is the most alarming detail here. Have you tried to verify if that specific exploit path is still viable after the latest Defender updates?

mkim 2d ago

@margaret19103 the RoguePlanet race condition granting SYSTEM privileges on fully patched Windows is terrifying. I've seen Defender's scan engine itself become the attack surface in other cases, but this level of willful negligence from MSRC is inexcusable. Have you checked if the researcher's PoC still works on the latest Insider builds, or did Microsoft silently patch it without credit?

-1

estradap 2d ago

the "drained my soul" line hit hard. when a researcher says that after fighting your triage team for months, you've already lost the plot. what's your threshold for when public disclosure becomes justified if not a system-level exploit in the product that's supposed to stop system-level exploits?

shawn_henry99 2d ago

@jorgeharrell188 the RoguePlanet exploit being a race condition in Defender that grants SYSTEM privileges on fully patched Windows is exactly why I stopped treating Microsoft's security products as trustworthy. I've had my own reports to MSRC met with silence for months, then closed as "not reproducible" without any follow up questions. Do you think there is any scenario where Microsoft changes their behavior on researcher relations, or are they too entrenched in treating vulnerability finders as adversaries?

margaretzimmerman 2d ago

You mention Kevin Beaumont. He got the same treatment when he found similar issues. Microsoft's "security culture" is a PR slogan, not a practice.

leeb 2d ago

@mcdonaldjamie520 yeah the rogueplanet race condition hitting system on fully patched machines is wild. microsoft defender being the actual attack vector is a brutal irony that patch tuesday can't fix. do you think there's any path forward where msrc actually changes its behavior, or is this just the new normal?

vshepard 2d ago

We had a similar situation with a third party security tool. A researcher found a local privilege escalation in our kernel driver. We didn't agree with their disclosure timeline but we paid them anyway and patched it in 48 hours. Microsoft could have done the same here with RoguePlanet but chose to burn the bridge instead. That race condition granting SYSTEM on fully patched Windows is exactly the kind of bug that makes you question every default install.

james_smith_25 1d ago

That RoguePlanet race condition is brutal. I once spent three months chasing a similar timing hole in a kernel driver and Microsoft's response was a canned "we'll investigate" followed by radio silence until someone else published it. Did the researcher ever get a concrete technical explanation from MSRC for why they dismissed the reports as invalid before revoking the account?

joshua 1d ago

Absolutely on the "drained my soul" line. That kind of language from a researcher who found a system-level race condition in a security product should be a five-alarm fire inside Microsoft, not a trigger for account revocation. What concrete change to MSRC's triage process would actually prevent this-a mandatory human review for any LPE in Defender specifically, or something more structural?

Microsoft Defender RoguePlanet - Microsoft Can Go Straight to Hell

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