MicroPython modselect.c poll_set_add_fd use after free
CVE-2023-7152

5.5MEDIUM

Key Information:

Vendor

Micropython

Status
Micropython
Vendor
CVE Published:
29 December 2023

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2023-7152?

A use after free vulnerability has been identified in MicroPython versions 1.21.0 and 1.22.0-preview, specifically within the poll_set_add_fd function found in extmod/modselect.c. This flaw allows an attacker to manipulate memory, potentially leading to unauthorized access or system instability. A public exploit has been disclosed, raising significant security concerns. Users are strongly advised to apply the available patch, identified under commit 8b24aa36ba978eafc6114b6798b47b7bfecdca26, to mitigate the risks associated with this vulnerability.

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Affected Version(s)

MicroPython 1.21.0

MicroPython 1.22.0-preview

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2023-7152 - Proof of Concept

References

https://vuldb.com/?id.249158
vdb-entrytechnical-description
https://vuldb.com/?ctiid.249158
signaturepermissions-required
https://github.com/micropython/micropython/issues/12887
exploitissue-tracking

CVSS V3.1

Score:
5.5
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Adjacent Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Junwha Hong
Wonil Jang
qbit (VulDB User)
JSON
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