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NEW WINDOWS 10 ZERO-DAY GIVES ADMIN RIGHTS, GETS UNOFFICIAL PATCH
By
SERGIU GATLAN
* November 27, 2021
* 10:00 AM
* 0
Free unofficial patches have been released to protect Windows users from a local
privilege escalation (LPE) zero-day vulnerability in the Mobile Device
Management Service impacting Windows 10, version 1809 and later.
The security flaw resides under the "Access work or school" settings, and it
bypasses a patch released by Microsoft in February to address an information
disclosure bug tracked as CVE-2021-24084.
However, security researcher Abdelhamid Naceri (who also reported the initial
vulnerability) discovered this month that the incompletely patched flaw could
also be exploited to gain admin privileges after publicly disclosing the newly
spotted bug in June.
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"Namely, as HiveNightmare/SeriousSAM has taught us, an arbitrary file disclosure
can be upgraded to local privilege escalation if you know which files to take
and what to do with them," 0patch co-founder Mitja Kolsek explained today.
"We confirmed this by using the procedure described in this blog post by Raj
Chandel in conjunction with Abdelhamid's bug - and being able to run code as
local administrator."
While Microsoft has most likely also noticed Naceri's June disclosure, the
company is yet to patch this LPE bug, exposing Windows 10 systems with the
latest November 2021 security updates to attacks.
Luckily, attackers can only exploit the vulnerability if two very specific
conditions are met:
* System protection must be enabled on drive C, and at least one restore point
created. Whether system protection is enabled or disabled by default depends
on various parameters.
* At least one local administrator account must be enabled on the computer, or
at least one "Administrators" group member's credentials cached.
UNNOFICIAL PATCHES FOR ALL IMPACTED WINDOWS 10 SYSTEMS
Until Microsoft releases security updates to address this security issue (likely
during next month's Patch Tuesday), the 0patch micropatching service has
released free and unofficial patches for all affected Windows 10 versions
(Windows 10 21H2 is also impacted but is not yet supported by 0patch):
1. Windows 10 v21H1 (32 & 64 bit) updated with November 2021 Updates
2. Windows 10 v20H2 (32 & 64 bit) updated with November 2021 Updates
3. Windows 10 v2004 (32 & 64 bit) updated with November 2021 Updates
4. Windows 10 v1909 (32 & 64 bit) updated with November 2021 Updates
5. Windows 10 v1903 (32 & 64 bit) updated with November 2021 Updates
6. Windows 10 v1809 (32 & 64 bit) updated with May 2021 Updates
"Windows Servers are not affected, as the vulnerable functionality does not
exist there. While some similar diagnostics tools exist on servers, they are
being executed under the launching user's identity, and therefore cannot be
exploited," Kolsek added.
"Windows 10 v1803 and older Windows 10 versions don't seem to be affected
either. While they do have the 'Access work or school' functionality, it behaves
differently and cannot be exploited this way. Windows 7 does not have the
'Access work or school' functionality at all."
HOW TO INSTALL THE MICROPATCH
To install the unofficial patch on your system, you will need to register a
0patch account and install the 0patch agent.
Once you launch the agent on your device, the patch will be applied
automatically (if there are no custom patching enterprise policies enabled to
block it) without requiring a restart.
This is the second Windows zero-day that received a micropatch this month after
Naceri found that patches for another bug (CVE-2021-34484) in the Windows User
Profile Service could be bypassed to escalate privileges on all Windows
versions, even if fully patched.
Microsoft also needs to patch a third zero-day bug in the Microsoft Windows
Installer with a proof-of-concept (PoC) exploit released by Naceri over the
weekend.
If successfully exploited, the zero-day allows attackers to gain SYSTEM
privileges on up-to-date devices running the latest Windows versions, including
Windows 10, Windows 11, and Windows Server 2022.
Malware creators have since started testing the PoC exploit in low volume
attacks likely focused on testing and tweaking it for future full-blown
campaigns.
RELATED ARTICLES:
Zero-day bug in all Windows versions gets free unofficial patch
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New Windows zero-day with public exploit lets you become an admin
All Windows versions impacted by new LPE zero-day vulnerability
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SERGIU GATLAN
Sergiu Gatlan is a reporter who covered cybersecurity, technology, Apple,
Google, and a few other topics at Softpedia for more than a decade. Email or
Twitter DMs for tips.
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