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Q1What is this vulnerability? (Essence + Consequences)
๐จ **Essence**: Attackers manipulate `TPML_PCR_SELECTION` to trick `tpm2_checkquote`. ๐ **Consequences**: Generates misleading TPM status quotes, breaking trust in hardware integrity verification.
Q2Root Cause? (CWE/Flaw)
๐ก๏ธ **CWE-807**: Relies on Unreliable Security Guard. ๐ **Flaw**: Inadequate validation of PCR selection inputs allows output manipulation.
Q3Who is affected? (Versions/Components)
๐ฆ **Vendor**: tpm2-software. ๐ฆ **Product**: tpm2-tools. ๐ **Affected**: Versions **5.6 and earlier**. (Upgrade to 5.7+ to fix!)
Q4What can hackers do? (Privileges/Data)
๐ต๏ธ **Hackers**: Can forge TPM quotes. ๐ **Impact**: High Confidentiality, Integrity, & Availability risk. Misleads security audits & remote attestation.
Q5Is exploitation threshold high? (Auth/Config)
๐ **Threshold**: **High** (AC:H). ๐ซ **Auth**: None required (PR:N). โ๏ธ **UI**: None required (UI:N). Requires specific technical knowledge to craft the PCR selection payload.
Q6Is there a public Exp? (PoC/Wild Exploitation)
๐ซ **Public Exp**: No PoC available in data. ๐ **Wild Exp**: Low risk currently. ๐ **Status**: Advisory published, but no active weaponization detected.
Q7How to self-check? (Features/Scanning)
๐ **Check**: Scan for `tpm2-tools` version. ๐ **Flag**: If version โค 5.6, you are vulnerable. ๐ ๏ธ **Tool**: Use package managers to verify installed versions.
๐ก๏ธ **Workaround**: If stuck on old version, restrict access to `tpm2_checkquote` functions. ๐ซ **Mitigation**: Disable remote attestation features relying on this tool until patched.