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RESEARCHERS PUBLISHED POC EXPLOIT CODE FOR ACTIVELY EXPLOITED WINDOWS ELEVATION
OF PRIVILEGE ISSUE

June 8, 2023  By Pierluigi Paganini




RESEARCHERS PUBLISHED AN EXPLOIT FOR AN ACTIVELY EXPLOITED MICROSOFT WINDOWS
VULNERABILITY TRACKED AS CVE-2023-29336.

The Microsoft Windows vulnerability CVE-2023-29336 (CVSS score 7.8) is an
elevation of privilege issue that resides in the Win32k component. Win32k.sys is
a system driver file in the Windows operating system. The driver is responsible
for providing the interface between user-mode applications and the Windows
graphical subsystem.

The vulnerability is actively exploited in attacks. The issue can be chained
with a code execution bug to spread malware. The vulnerability was reported by
researchers Jan Vojtěšek, Milánek, and Luigino Camastra from Avast Antivirus
firm. The researchers believe this flaw was used as part of an exploit chain to
deliver malware.


00:00/00:00


“An attacker who successfully exploited this vulnerability could gain SYSTEM
privileges.” reads the advisory.

Microsoft addressed the issue with the release of Patch Tuesday security updates
for May 2023.

Win32k.sys is loaded into memory during the system startup and remains active
throughout the operating system’s runtime. A flaw in the Win32k.sys driver can
be exploited by attackers to gain unauthorized access to a system.

Researchers from Singapore-based cybersecurity firm Numen Cyber have published a
detailed analysis of the vulnerability along with a proof-of-concept (PoC)
exploit that works against Windows Server 2016.

The experts pointed out that this vulnerability seems to be non-exploitable on
the Windows 11 systems, however, it poses a significant risk to earlier systems.

“It appears that the previous code implementation focused solely on locking the
window object, inadvertently neglecting to lock the menu object nested within
the window object.” reads the analysis published by the experts.

The analysis of the code revealed that the previous code implementation was only
locking the window object, failing to secure the menu object contained within
the window object

The experts explained that this type of vulnerability relied on leaked desktop
heap handle addresses in the heap memory.

Below is a video demonstrating how the exploit works on Windows Server 2016.



“Exploiting this particular vulnerability does not generally pose significant
challenges. Apart from diligently exploring different methods to gain control
over the first write operation using the reoccupied data from freed memory,
there is typically no need for novel exploitation techniques. This type of
vulnerability heavily relies on leaked desktop heap handle addresses.” concludes
the flaw. “While there may have been some modifications, if this issue is not
thoroughly addressed, it remains a security risk for older systems.”

Follow me on Twitter: @securityaffairs and Facebook and Mastodon

Pierluigi Paganini

(SecurityAffairs – hacking, Kimsuky)






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PIERLUIGI PAGANINI

Pierluigi Paganini is member of the ENISA (European Union Agency for Network and
Information Security) Threat Landscape Stakeholder Group and Cyber G7 Group, he
is also a Security Evangelist, Security Analyst and Freelance Writer.
Editor-in-Chief at "Cyber Defense Magazine", Pierluigi is a cyber security
expert with over 20 years experience in the field, he is Certified Ethical
Hacker at EC Council in London. The passion for writing and a strong belief that
security is founded on sharing and awareness led Pierluigi to find the security
blog "Security Affairs" recently named a Top National Security Resource for US.
Pierluigi is a member of the "The Hacker News" team and he is a writer for some
major publications in the field such as Cyber War Zone, ICTTF, Infosec Island,
Infosec Institute, The Hacker News Magazine and for many other Security
magazines. Author of the Books "The Deep Dark Web" and “Digital Virtual Currency
and Bitcoin”.




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