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Low ALAS2023-2023-110 1 CVE

Low: tpm2-tss security update (Amazon Linux 2023)

Published Feb 17, 2023 · Updated Feb 22, 2023

Summary

Package updates are available for Amazon Linux 2023 that fix the following vulnerabilities: CVE-2023-22745: 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.

Fixed packages 4

ReleasePackageFixed in
Amazon Linux · 2023 tpm2-tss 0:3.1.0-1.amzn2023.0.3
Amazon Linux · 2023 tpm2-tss-debuginfo 0:3.1.0-1.amzn2023.0.3
Amazon Linux · 2023 tpm2-tss-debugsource 0:3.1.0-1.amzn2023.0.3
Amazon Linux · 2023 tpm2-tss-devel 0:3.1.0-1.amzn2023.0.3

Vulnerabilities 1

  • Medium 6.4

    Buffer Overlow in TSS2_RC_Decode in tpm2-tss

    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 `lay…

References

  • web
    https://alas.aws.amazon.com/cve/html/CVE-2023-22745.html