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← Vulnerability in Windows Update allows downgrade attacks (August 2024)
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WINDOWS SERVER AT RISK FROM POC EXPLOIT FOR CVE-2024-38077
Posted on 2024-08-09 by guenni
[German]Another follow-up to the July 2024 patchday, in which Microsoft closed
the vulnerability CVE-2024-38077 in the Windows Remote Desktop Licensing (RDL)
service of Windows Server. This is a Remote Code Execution (RCE) vulnerability
that has been rated with a CVSS 3.1 score of 9.8. Anyone who has not yet patched
should do so immediately. A proof of concept (PoC) for this vulnerability has
been published. Although this publication was taken offline again after a few
hours, attacks can be expected soon.
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WINDOWS SERVER VULNERABILITY CVE-2024-38077
I checked it, Microsoft has not yet published any details about the
vulnerability CVE-2024-38077. The linked CVE post only states that it is a
Remote Code Execution vulnerability (RCE) that has been rated as absolutely
critical with a CVSS 3.1 score of 9.8.
The vulnerability in the Windows Remote Desktop Licensing (RDL) service allows
attacks on the network and requires only a low level of complexity for
successful exploitation. Microsoft states that an unauthenticated attacker could
connect to the Remote Desktop Licensing service to send a malicious message that
could allow remote code execution.
No special privileges are required for exploitation. However, the Windows Remote
Desktop Licensing (RDL) service must be enabled (see also the comment below). So
far there is probably no exploitation and Microsoft sees a low probability of
exploitation. At the same time, Microsoft has released updates for Windows
Server versions that are still supported and recommends installing them
urgently. I have extracted the patches from July 9, 2024 for the respective
server versions below.
* KB5040499; KB5040490: Windows Server 2008
* KB5040497; KB5040498: Windows Server 2008 R2
* KB5040485: Windows Server 2012
* KB5040456: Windows Server 2012 R2
* KB5040434: Windows Server 2016
* KB5040430: Windows Server 2019
* KB5040437: Windows Server 2022
* KB5040438: Windows Server 2022 23H2
So there are security updates available for the above vulnerability, which I
have also mentioned in the Patchday posts (see links at the end of the article).
There is also the advice to deactivate the Remote Desktop Licensing Service – if
it has been activated but is not needed. However, some administrators may not
have installed the updates due to various problems mentioned in the links at the
end of the article. And it is not possible to deactivate the service. Then these
cases run into potential problems.
> The Windows Remote Desktop Licensing Service (RDL) is responsible for managing
> Remote Desktop Services licenses. The service should only be available if
> Remote Desktop Services (RDS) is installed on the server. However, RDL is then
> used in many companies. Security researchers have discovered that the RDL
> services of at least 170,000 instances are accessible via the Internet. These
> installations are vulnerable to attack, and the fact that the RDL service is
> often integrated into critical business systems and remote desktop clusters
> doesn't make it any better.
PROOF OF CONCEPT (POC) FOR CVE-2024-38077
I was startled by the following tweet from Nicolas Krassas. He writes that a
0-click RCE has been published for CVE-2024-38077, which threatens all Windows
server systems that are not patched.
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Security Online has taken up the matter in this blog post after three security
researchers managed to create code for a proof-of-concept (PoC) exploit for the
critical vulnerability CVE-2024-38077 (MadLicense) and reported it on the
Internet. This vulnerability, which allows remote code execution (RCE) before
authentication, affects all versions of Windows Server 2000 through 2025 and
gives attackers the ability to take complete control of a target server without
requiring user interaction.
The vulnerability, known as MadLicense, exploits a simple heap overflow in the
CDataCoding::DecodeData procedure. By manipulating user-controlled input,
attackers can trigger a buffer overflow that leads to the execution of arbitrary
code in the context of the RDL service, it says.
ALL WINDOWS SERVER VERSIONS AT RISK
The security researchers mentioned above developed the proof-of-concept (POC)
exploit for Windows Server 2025 to demonstrate its exploitability and achieved a
success rate of nearly 100%. The exploit effectively bypasses all current
protections, including the recently introduced LFH protections in Windows Server
2025, writes Security Online in this blog post.
While the PoC demonstrates the exploitation of the vulnerability on Windows
Server 2025, the researchers see that the vulnerability could be exploited
faster and more efficiently on older versions of Windows Server, where fewer
protections are in place.
DISCOVERY REPORTED, POC REPORT NOW OFFLINE
The security researchers reported the vulnerability to Microsoft a month before
it was published, writes Security Online. Microsoft patched the vulnerability in
July 2024, but initially classified the exploitation as "less likely". The
suspicion arises that the threats were underestimated.
But the drama unfortunately continues, or rather it gets interesting: The blog
post from Security Online was published a few hours ago and I came across the
topic overnight. This morning, when I tried to read the whole thing and write a
blog post, I was amazed. In the meantime, the Google page where a security
researcher explaining the proof-of-concept (POC) exploit has already disappeared
again. The associated YouTube video by the security researchers is also no
longer available on the Internet. The search engine caches seems also to be
cleared.
Conclusion: In my opinion, the hut is on fire and the security researchers have
uncovered something that should not (yet) be published. However, I assume that
the content of the page [sites.google[.]com/site/zhiniangpeng/blogs/MadLicense]
has been read and accessed by interested third parties. It may not be long
before the vulnerability is exposed to attacks. For administrators in companies
responsible for Windows Server, there are three measures to take:
* Ensure that the Windows Remote Desktop Licensing (RDL) service is not
accessible via the Internet.
* If the Windows Remote Desktop Licensing Service (RDL) is not required, it
should be deactivated.
* Install the relevant security updates from July 2024 to mitigate the
vulnerability.
As it currently stands, it will once again affect systems that are not actively
managed when the first exploitation campaigns start. And it puts administrators
in trouble who are unable to install the July 2024 updates due to problems such
as broken Remote Desktop (see following article links).
Similar articles:
Microsoft Security Update Summary (July 9, 2024)
Patchday: Windows 10/Server Updates (July 9, 2024)
Patchday: Windows 11/Server 2022-Updates (July 9, 2024)
Windows Server 2012 / R2 und Windows 7 (July 9, 2024)
Windows 11 update KB5040442 causes issues with Outlook 2021
Windows July 2024 updates break remote connections
Windows 10/11 updates (e.g. KB5040442) trigger Bitlocker queries (July 2024)
Windows Update July 2024: Are there issues with Radius authentications?
July 2024 security update KB5040427 crashes Windows 10/Server LPD printing
service
Microsoft's fixes for various Windows bugs (July 2024)
Windows Patchday news: MSHTML 0-day vulnerability CVE-2024-38112 exploited by
malware
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This entry was posted in Security, Update, Windows and tagged Patchday 7.2024,
Security, Update, Windows Server. Bookmark the permalink.
← Vulnerability in Windows Update allows downgrade attacks (August 2024)
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ONE RESPONSE TO WINDOWS SERVER AT RISK FROM POC EXPLOIT FOR CVE-2024-38077
1. Jorge M. says:
2024-08-11 at 17:57
Some info for readers:
https://borncity.com/win/2024/07/19/workaround-for-broken-windows-remote-desktop-gateway-service-after-july-2024-updates/#comment-17217
Interesting that article is not on Similar articles, but is very relevant.
Thank you.
PS: Install the MS patch. Now! And test the one that Microsoft will publish
in a few days at the next Patch Tuesday.
Reply
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