CVE-2024-30085 is a high-severity vulnerability identified in the Windows Cloud Files Mini Filter Driver (cldflt.sys). This vulnerability arises from a heap-based buffer overflow issue, which can be exploited by local attackers to escalate privileges and gain SYSTEM-level access. This poses a significant security risk as it allows attackers to execute arbitrary code with elevated permissions.
Key Details:
- CVSS Score: 7.8 (High)
- Affected Systems: Windows 11 23H2 installations
- Mitigation: Microsoft has released a patch in the June 2024 Patch Tuesday updates.
Technical Overview:
The vulnerability is rooted in the improper validation of user-supplied data lengths before copying them into a fixed-length heap-based buffer. This oversight allows attackers to craft a malicious input that exceeds the buffer’s allocated size, leading to memory corruption. By exploiting this condition, attackers can manipulate the execution flow of the software, eventually gaining SYSTEM-level privileges.
Exploitation:
To exploit this vulnerability, an attacker typically needs to have local access to the targeted machine. They would create a custom reparse point, which is a type of filesystem object that can redirect file system operations to an alternate path or object. By manipulating the reparse point and triggering the buffer overflow, the attacker can execute malicious code with SYSTEM-level privileges.
Mitigation Strategies:
Microsoft has released a patch to address CVE-2024-30085 as part of the June 2024 Patch Tuesday updates. Users and administrators are strongly advised to apply this patch as soon as possible to mitigate the risk of exploitation.
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