Cosign verification accepts any valid Rekor entry under certain conditions

Cosign provides code signing and transparency for containers and binaries. Prior to versions 2.6.2 and 3.0.4, Cosign bundle can be crafted to successfully verify an artifact even if the embedded Rekor entry does not reference the artifact's digest, signature or public key. When verifying a Rekor entry, Cosign verifies the Rekor entry signature, and also compares the artifact's digest, the user's public key from either a Fulcio certificate or provided by the user, and the artifact signature to the Rekor entry contents. Without these comparisons, Cosign would accept any response from Rekor as valid. A malicious actor that has compromised a user's identity or signing key could construct a valid Cosign bundle by including any arbitrary Rekor entry, thus preventing the user from being able to audit the signing event. This issue has been patched in versions 2.6.2 and 3.0.4.

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

对数据真实性的验证不充分

cosign 数据伪造问题漏洞

cosign是美国的一个 OCI 注册表中的容器签名、验证和存储。 Cosign 2.6.2之前版本和3.0.4之前版本存在数据伪造问题漏洞，该漏洞源于即使嵌入的Rekor条目未引用工件的摘要、签名或公钥，特制的Cosign包也能验证成功，可能影响签名事件的可审计性。

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