Overview
In this post, we’ll delve into the details of a recently discovered vulnerability-CVE-2023-28909-found within the Bluetooth stack of the MIB3 infotainment unit. This flaw is particularly concerning as it primarily affects the Skoda Superb III car, which is equipped with the MIB3 infotainment unit. This vulnerability exposes the user’s infotainment system to potential attacks that could compromise the system and lead to data leakage.
The significance of this vulnerability extends beyond just the automotive industry; it represents a broader concern in the cybersecurity landscape. As technology continues to evolve and integrate into everyday items such as cars, the potential for these types of vulnerabilities also grows, making it crucial for cybersecurity professionals and users to stay informed and proactive.
Vulnerability Summary
CVE ID: CVE-2023-28909
Severity: High (8.0 CVSS Score)
Attack Vector: Bluetooth Stack
Privileges Required: Low
User Interaction: Required
Impact: System compromise and potential data leakage
Affected Products
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Product | Affected Versions
MIB3 Infotainment Unit | OEM Part Number: 3V0035820
How the Exploit Works
The vulnerability stems from the lack of proper validation of user-supplied data within the Bluetooth stack of the MIB3 unit. This insufficiency can lead to an integer overflow when receiving fragmented HCI packets on a channel. An attacker can leverage this flaw to sidestep the MTU check on a channel with enabled fragmentation.
The consequence of this bypass is a buffer overflow in upper layer profiles, which can be exploited to obtain remote code execution. This means that an attacker can execute arbitrary code, potentially compromising the system and leading to data leakage.
Conceptual Example Code
While the exact exploitation would depend on the specific configuration of the MIB3 unit and the attacker’s knowledge, the concept can be illustrated with a pseudocode example:
def exploit(target_device):
# Create a malicious HCI packet with size greater than MTU
malicious_packet = create_fragmented_packet(size=target_device.mtu + 1)
# Send the malicious packet to the target device
target_device.send(malicious_packet)
# If the device is vulnerable, this could cause a buffer overflow
# leading to potential remote code executionIt’s important to note that this is a simplified representation of the exploit. The actual implementation would be significantly more complex and require a deep understanding of both the Bluetooth protocol and the specifics of the MIB3 unit’s implementation.