MBed OS 6.16.0 HCI Parsing buffer overflow

Summaryinfo

A vulnerability was found in MBed OS 6.16.0 and classified as critical. This affects an unknown function of the component HCI Parsing. Such manipulation leads to buffer overflow. This vulnerability is referenced as CVE-2024-48984. No exploit is available. It is best practice to apply a patch to resolve this issue.

Detailsinfo

A vulnerability, which was classified as critical, has been found in MBed OS 6.16.0. Affected by this issue is an unknown code of the component HCI Parsing. 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. CVE summarizes:

An issue was discovered in MBed OS 6.16.0. When parsing hci reports, the hci parsing software dynamically determines the length of a list of reports by reading a byte from an input stream. It then fetches the length of the first report, uses it to calculate the beginning of the second report, etc. In doing this, it tracks the largest report so it can later allocate a buffer that fits every individual report (but only one at a time). It does not, however, validate that these addresses are all contained within the buffer passed to hciEvtProcessLeExtAdvReport. It is then possible, though unlikely, that the buffer designated to hold the reports is allocated in such a way that one of these out-of-bounds length fields is contained within the new buffer. When the (n-1)th report is copied, it overwrites the length field of the nth report. This now corrupted length field is then used for a memcpy into the new buffer, which may lead to a buffer overflow.

The advisory is available at github.com. This vulnerability is handled as CVE-2024-48984 since 10/11/2024. The exploitation is known to be easy. The technical details are unknown and an exploit is not available.

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

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Productinfo

Vendor

• MBed

Name

• OS

Version

• 6.16.0

CPE 2.3info

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• 🔍

CPE 2.2info

• 🔍
• 🔍

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