CVE-2023-22745
Publication date 19 January 2023
Last updated 24 July 2024
Ubuntu priority
tpm2-tss is an open source software implementation of the Trusted Computing Group (TCG) Trusted Platform Module (TPM) 2 Software Stack (TSS2). In affected versions `Tss2_RC_SetHandler` and `Tss2_RC_Decode` both index into `layer_handler` with an 8 bit layer number, but the array only has `TPM2_ERROR_TSS2_RC_LAYER_COUNT` entries, so trying to add a handler for higher-numbered layers or decode a response code with such a layer number reads/writes past the end of the buffer. This Buffer overrun, could result in arbitrary code execution. An example attack would be a MiTM bus attack that returns 0xFFFFFFFF for the RC. Given the common use case of TPM modules an attacker must have local access to the target machine with local system privileges which allows access to the TPM system. Usually TPM access requires administrative privilege.
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| tpm2-tss | 24.04 LTS noble |
Not affected
|
| 22.04 LTS jammy |
Fixed 3.2.0-1ubuntu1.1
|
|
| 20.04 LTS focal |
Fixed 2.3.2-1ubuntu0.20.04.2
|
|
| 18.04 LTS bionic |
Not affected
|
|
| 16.04 LTS xenial |
Not affected
|
|
| 14.04 LTS trusty | Ignored |
Notes
mdeslaur
accessing the TPM requires administrative privileges, so this is an unimportant attack scenario, setting priority to low
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score |
6.4 · Medium
|
| Attack vector | Local |
| Attack complexity | High |
| Privileges required | High |
| User interaction | None |
| Scope | Unchanged |
| Confidentiality | High |
| Integrity impact | High |
| Availability impact | High |
| Vector | CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H |
References
Related Ubuntu Security Notices (USN)
- USN-6796-1
- TPM2 Software Stack vulnerabilities
- 29 May 2024