Missing ASN1_TYPE validation in OpenSSL TS_RESP_verify_response()
CVE-2025-69420 is a type confusion vulnerability in OpenSSL's TimeStamp Response verification path. In TS_RESP_verify_response(), the helper functions ossl_ess_get_signing_cert() and ossl_ess_get_signing_cert_v2() access an ASN1_TYPE union member for the signing certificate attribute without first validating that the ASN.1 type is V_ASN1_SEQUENCE. When a malformed RFC 3161 TimeStamp Response supplies an unexpected ASN1_TYPE, OpenSSL can dereference an invalid or NULL pointer via the ASN1_TYPE union, causing a crash during verification. The issue affects OpenSSL 3.6, 3.5, 3.4, 3.3, 3.0, and 1.1.1. OpenSSL 1.0.2 is not affected. The OpenSSL FIPS modules in 3.5, 3.4, 3.3, and 3.0 are not affected because the vulnerable TimeStamp Response implementation is outside the FIPS module boundary.
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An OpenSSL vulnerability patched by upgrading to OpenSSL 3.6.1 in IPFire Core Update 200.
Unknown (listed among related OpenSSL CVEs, but not described in the content).
Low-severity OpenSSL null pointer dereference in timestamp verification, typically resulting in denial of service when processing crafted timestamp-related inputs.
An OpenSSL vulnerability addressed in Alpine Linux stable releases 3.20.9, 3.21.6, 3.22.3, and 3.23.3.
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Cross-references every affected SKU, including bundled OEM variants.
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