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CVE-2024-8946— MicroPython VFS Unmount vfs.c mp_vfs_umount heap-based overflow

Quick assessment

Affected
n/a MicroPython
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

MicroPython是MicroPython开源的一个小型的开源Python编程语言解释器。 MicroPython 1.23.0版本存在安全漏洞，该漏洞源于VFS Unmount Handler组件中的mp_vfs_umount函数，在VFS卸载过程中，仅基于卸载字符串的长度来比较挂载路径字符串和卸载请求字符串，这可能导致堆缓冲区溢出读取。

CVSS 7.3 · High EPSS 1.01% · P60

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution
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I. Basic Information for CVE-2024-8946

Vulnerability Information
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Vulnerability Title
MicroPython VFS Unmount vfs.c mp_vfs_umount heap-based overflow
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability was found in MicroPython 1.23.0. It has been classified as critical. Affected is the function mp_vfs_umount of the file extmod/vfs.c of the component VFS Unmount Handler. The manipulation leads to heap-based buffer overflow. It is possible to launch the attack remotely. The exploit has been disclosed to the public and may be used. The name of the patch is 29943546343c92334e8518695a11fc0e2ceea68b. It is recommended to apply a patch to fix this issue. In the VFS unmount process, the comparison between the mounted path string and the unmount requested string is based solely on the length of the unmount string, which can lead to a heap buffer overflow read.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
堆缓冲区溢出
Source: CVE Program / CVE List V5
Vulnerability Title
MicroPython 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
MicroPython是MicroPython开源的一个小型的开源Python编程语言解释器。 MicroPython 1.23.0版本存在安全漏洞，该漏洞源于VFS Unmount Handler组件中的mp_vfs_umount函数，在VFS卸载过程中，仅基于卸载字符串的长度来比较挂载路径字符串和卸载请求字符串，这可能导致堆缓冲区溢出读取。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
- MicroPython 1.23.0 -

II. Public POCs for CVE-2024-8946

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 10308 chars
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III. Intelligence Information for CVE-2024-8946

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Vendor Advisories for CVE-2024-8946 (2)

Same Patch Batch · n/a · 2024-09-17 · 9 CVEs total

CVE-2024-38812 9.8 CRITICAL Heap-overflow vulnerability
CVE-2024-38813 7.5 HIGH Privilege escalation vulnerability
CVE-2024-8948 7.3 HIGH MicroPython objint.c mpz_as_bytes heap-based overflow
CVE-2024-8947 5.6 MEDIUM MicroPython objarray.c use after free
CVE-2024-46085 FrogCms 安全漏洞
CVE-2024-46362 FrogCms 安全漏洞
CVE-2024-47047 TYPO3 安全漏洞
CVE-2024-47049 File Handling and Storage Helper 安全漏洞

IV. Related Vulnerabilities

Same product: MicroPython
Same vendor: n/a
Same weakness: CWE-122

V. Comments for CVE-2024-8946

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