CVE-2024-1638

Public Exploit
Bluetooth characteristic LESC security requirement not enforced without additional flags

Description

The documentation specifies that the BT_GATT_PERM_READ_LESC and BT_GATT_PERM_WRITE_LESC defines for a Bluetooth characteristic: Attribute read/write permission with LE Secure Connection encryption. If set, requires that LE Secure Connections is used for read/write access, however this is only true when it is combined with other permissions, namely BT_GATT_PERM_READ_ENCRYPT/BT_GATT_PERM_READ_AUTHEN (for read) or BT_GATT_PERM_WRITE_ENCRYPT/BT_GATT_PERM_WRITE_AUTHEN (for write), if these additional permissions are not set (even in secure connections only mode) then the stack does not perform any permission checks on these characteristics and they can be freely written/read.

Category

8.2
CVSS
Severity: High
CVSS 3.1 •
EPSS 0.15%
Vendor Advisory github.com
Affected: zephyrproject-rtos Zephyr
Published at:
Updated at:

References

Link Tags
https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-p6f3-f63q-5mc2 vendor advisory exploit

Frequently Asked Questions

What is the severity of CVE-2024-1638?
CVE-2024-1638 has been scored as a high severity vulnerability.
How to fix CVE-2024-1638?
To fix CVE-2024-1638, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2024-1638 being actively exploited in the wild?
It is possible that CVE-2024-1638 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2024-1638?
CVE-2024-1638 affects zephyrproject-rtos Zephyr.
This platform uses data from the NIST NVD, MITRE CVE, MITRE CWE, First.org and CISA KEV but is not endorsed or certified by these entities. CVE is a registred trademark of the MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. CWE is a registred trademark of the MITRE Corporation and the authoritative source of CWE content is MITRE's CWE web site.
© 2025 Under My Watch. All Rights Reserved.