MBed OS 6.16.0 HCI Packet buffer overflow

Summaryinfo

A vulnerability identified as critical has been detected in MBed OS 6.16.0. Affected is an unknown function of the component HCI Packet Handler. The manipulation leads to buffer overflow. This vulnerability is documented as CVE-2024-48985. There is not any exploit available. Applying a patch is the recommended action to fix this issue.

Detailsinfo

A vulnerability, which was classified as critical, has been found in MBed OS 6.16.0. This issue affects some unknown functionality of the component HCI Packet Handler. The manipulation with an unknown input leads to a buffer overflow vulnerability. Using CWE to declare the problem leads to CWE-120. The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

An issue was discovered in MBed OS 6.16.0. During processing of HCI packets, the software dynamically determines the length of the packet data by reading 2 bytes from the packet data. A buffer is then allocated to contain the entire packet, the size of which is calculated as the length of the packet body determined earlier and the header length. If the allocate fails because the specified packet is too large, no exception handling occurs and hciTrSerialRxIncoming continues to write bytes into the 4-byte large temporary header buffer, leading to a buffer overflow. This can be leveraged into an arbitrary write by an attacker. It is possible to overwrite the pointer to the buffer that is supposed to receive the contents of the packet body but which couldn't be allocated. One can then overwrite the state variable used by the function to determine which step of the parsing process is currently being executed. This advances the function to the next state, where it proceeds to copy data to that arbitrary location. The packet body is then written wherever the corrupted data pointer is pointing.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2024-48985 since 10/11/2024. The exploitation is known to be easy. Neither technical details nor an exploit are publicly available.

Applying a patch is able to eliminate this problem. The bugfix is ready for download at github.com.

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Vendor

• MBed

Name

• OS

Version

• 6.16.0

CPE 2.3info

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• 🔍

CPE 2.2info

• 🔍
• 🔍

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If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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