CVE-2024-53208
Description
A flaw was found in the Linux kernel's Bluetooth subsystem. A local user with administrative privileges can trigger a use-after-free condition by issuing Bluetooth power configuration commands while the controller interface is closing. This flaw allows an attacker to cause a Denial of Service (DoS) through a system crash or potentially execute arbitrary code by dereferencing freed kernel memory.
Statement
This issue is considered to be a moderate impact flaw, as the exploitation for this will need an ADMIN (or ROOT) privilege (PR:H).
Mitigation
To mitigate this vulnerability, prevent the Bluetooth kernel module from loading on systems where Bluetooth functionality is not required.
1. Create a configuration file to disable loading the module:
# echo "install bluetooth /bin/true" > /etc/modprobe.d/disable-bluetooth.conf
2. Additionally, blacklist the module:
# echo "blacklist bluetooth" >> /etc/modprobe.d/disable-bluetooth.conf
Caveats:
Disabling the bluetooth module will prevent all Bluetooth devices and networking from functioning. If the module is already loaded into memory, a system restart is required for the configuration to take effect.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 6.8 | 7.8 | 7.8 |
| Attack Vector | Adjacent Network | Local | Local |
| Attack Complexity | Low | Low | Low |
| Privileges Required | High | Low | Low |
| User Interaction | None | None | None |
| Scope | Unchanged | Unchanged | Unchanged |
| Confidentiality | High | High | High |
| Integrity Impact | High | High | High |
| Availability Impact | High | High | High |
Vector
Red Hat: CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
NVD: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
cve.org: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Understanding the Weakness (CWE)
Integrity
Technical Impact: Modify Memory
The use of previously freed memory may corrupt valid data, if the memory area in question has been allocated and used properly elsewhere.
Availability
Technical Impact: DoS: Crash, Exit, or Restart
If chunk consolidation occurs after the use of previously freed data, the process may crash when invalid data is used as chunk information.
Confidentiality
Technical Impact: Read Memory
Read operations on freed memory can sometimes leak sensitive information instead of causing a crash
Integrity,Confidentiality,Availability
Technical Impact: Execute Unauthorized Code or Commands
If malicious data is entered before chunk consolidation can take place, it may be possible to take advantage of a write-what-where primitive to execute arbitrary code. If the newly allocated data happens to hold a class, in C++ for example, various function pointers may be scattered within the heap data. If one of these function pointers is overwritten with an address to valid shellcode, execution of arbitrary code can be achieved.
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