Vulnerability · Published Jan 19, 2023 · Assigned by GitHub_M
CVE-2023-22745Buffer Overlow in TSS2_RC_Decode in tpm2-tss
Medium 6.4
In plain English
A medium-severity buffer overflow in tpm2-tss from tpm2-software. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 45% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
tpm2-tss is an open source software implementation of the Trusted Computing Group (TCG) Trusted Platform Module (TPM) 2 Software Stack (TSS2). In versions prior to 4.1.0-rc0, 4.0.1, and 3.2.2-rc1, `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. Versions 4.1.0-rc0, 4.0.1, and 3.2.2-rc1 fix the issue.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:8 | tpm2-tss | 2.3.2-5.el8 | ALSA-2023:7166 |
| AlmaLinux:9 | tpm2-tss | 3.2.2-2.el9 | ALSA-2023:6685 |
| AlmaLinux:8 | tpm2-tss-devel | 2.3.2-5.el8 | ALSA-2023:7166 |
| AlmaLinux:9 | tpm2-tss-devel | 3.2.2-2.el9 | ALSA-2023:6685 |
| Debian:12 | tpm2-tss | 3.2.1-3 | DEBIAN-CVE-2023-22745 |
| Debian:13 | tpm2-tss | 3.2.1-3 | DEBIAN-CVE-2023-22745 |
| Debian:14 | tpm2-tss | 3.2.1-3 | DEBIAN-CVE-2023-22745 |
| Ubuntu:22.04:LTS | tpm2-tss | 3.2.0-1ubuntu1.1 | UBUNTU-CVE-2023-22745 |
| Ubuntu:22.04:LTS | tpm2-tss | 3.2.0-1ubuntu1.1 | USN-6796-1 |
| Ubuntu:24.04:LTS | tpm2-tss | 4.0.1-7.1ubuntu5.1 | USN-6796-1 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| tpm2-software | tpm2-tss | < 4.0.1< 3.2.2-rc0 |
Weakness: CWE-120 · Vector: CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
References
- https://github.com/tpm2-software/tpm2-tss/security/advisories/GHSA-4j3v-fh23-vx67 x_refsource_CONFIRM
- https://github.com/tpm2-software/tpm2-tss/commit/306490c8d848c367faa2d9df81f5e69dab46ffb5 x_refsource_MISC
- https://github.com/tpm2-software/tpm2-tss/commit/49107d65d5c7be430671398416bbd89dae4e34e7 x_refsource_MISC
- https://github.com/tpm2-software/tpm2-tss/commit/7ab42953216adec046d000a5e3085f3ee5e9cabf x_refsource_MISC