Bug 2278077 (CVE-2024-29040)

Summary: CVE-2024-29040 tpm2-tss: arbitrary quote data may go undetected by Fapi_VerifyQuote
Product: [Other] Security Response Reporter: Robb Gatica <rgatica>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: tpm2-tss 4.1.0 Doc Type: ---
Doc Text:
A flaw was found in the tpm2-tss package, where it was not checked to see if the magic number in the attest is equal to the TPM2_GENERATED_VALUE. This flaw allows an attacker to generate arbitrary quote data, which may not be detected by Fapi_VerifyQuote.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On: 2292189    
Bug Blocks: 2278069    

Description Robb Gatica 2024-05-01 01:29:28 UTC 
After deserializing the quote info it was not checked whether the magic number in the attest is equal TPM2_GENERATED_VALUE. So a malicious attacker could generate arbitrary quote data which was not detected by Fapi_VerifyQuote. Now the number magic number is checked in verify quote and also
in the deserialization of TPM2_GENERATED. The check is also added to the Unmarshal function for TPMS_ATTEST.

Reference:
https://github.com/tpm2-software/tpm2-tss/commit/710cd0b6adf3a063f34a8e92da46df7a107d9a99
Comment 2 Dhananjay Arunesh 2024-06-13 11:23:45 UTC 
Created tpm2-tss tracking bugs for this issue:

Affects: fedora-all [bug 2292189]