Integer Overflow Leading to MTU Bypass
Key facts
- Attack vector
- Adjacent network
- Privileges required
- None
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-190 and the CVSS impact.
Summary
A specific flaw exists within the Bluetooth stack of the MIB3 unit. The issue results from the lack of proper validation of user-supplied data, which can result in an integer overflow when receiving fragmented HCI packets on a channel. An attacker can leverage this vulnerability to bypass the MTU check on a channel with enabled fragmentation. Consequently, this can lead to a buffer overflow in upper layer profiles, which can be used to obtain remote code execution. The vulnerability was originally discovered in Skoda Superb III car with MIB3 infotainment unit OEM part number 3V0035820. The list of affected MIB3 OEM part numbers is provided in the referenced resources.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Preh Car Connect GmbH (JOYNEXT GmbH) | Volkswagen MIB3 infotainment system MIB3 OI MQB | up to 0304 | — | No fix listed | CNA |
- Volkswagen MIB3 infotainment system MIB3 OI MQB VendorPreh Car Connect GmbH (JOYNEXT GmbH) Affected up to 0304 Fixed in — No fix listed CNA
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2023-28909
- 2026-10-03 Alias added: GHSA-px4q-7qhm-g854
References
More Preh Car Connect GmbH (JOYNEXT GmbH) vulnerabilities
- TI-2023-13398 Heap buffer overflow in picserver CVSS 3.1HIGH 8.0
- TI-2023-13399 Command injection in networking service CVSS 3.1HIGH 7.8
- TI-2023-13400 A lack of access restrictions on internal memory regions CVSS 3.1MEDIUM 6.7
- TI-2023-13401 Integer Overflow in Non-Fragmented Data Reception CVSS 3.1MEDIUM 5.4
- TI-2023-13397 Bypass of secure boot process CVSS 3.1MEDIUM 5.2
- TI-2023-13396 Integer overflow in Preh Car Connect GmbH (JOYNEXT GmbH) Volkswagen MIB3 infotainment… CVSS 3.1LOW 3.3
Sources
- CVE-2023-28909 · CVE Program
- CVE-2023-28909 · NVD
- FIRST EPSS
- GHSA-px4q-7qhm-g854 · GitHub Advisory Database · CC BY 4.0
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