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CVE-2022-36056— Vulnerabilities with blob verification in sigstore cosign

Quick assessment

Affected
sigstore cosign
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

cosign是美国的一个 OCI 注册表中的容器签名、验证和存储。 cosign 1.12.0之前版本存在数据伪造问题漏洞，该漏洞源于Bundle不匹配导致验证无效、在某些情况下不检查证书身份、没有实验标志的无效 Rekor bundle 、无效的透明日志条目。

CVSS 5.5 · Medium EPSS 0.15% · P4
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I. Basic Information for CVE-2022-36056

Vulnerability Information
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Vulnerability Title
Vulnerabilities with blob verification in sigstore cosign
Source: CVE Program / CVE List V5
Vulnerability Description
Cosign is a project under the sigstore organization which aims to make signatures invisible infrastructure. In versions prior to 1.12.0 a number of vulnerabilities have been found in cosign verify-blob, where Cosign would successfully verify an artifact when verification should have failed. First a cosign bundle can be crafted to successfully verify a blob even if the embedded rekorBundle does not reference the given signature. Second, when providing identity flags, the email and issuer of a certificate is not checked when verifying a Rekor bundle, and the GitHub Actions identity is never checked. Third, providing an invalid Rekor bundle without the experimental flag results in a successful verification. And fourth an invalid transparency log entry will result in immediate success for verification. Details and examples of these issues can be seen in the GHSA-8gw7-4j42-w388 advisory linked. Users are advised to upgrade to 1.12.0. There are no known workarounds for these issues.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
密码学签名的验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
cosign 数据伪造问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
cosign是美国的一个 OCI 注册表中的容器签名、验证和存储。 cosign 1.12.0之前版本存在数据伪造问题漏洞，该漏洞源于Bundle不匹配导致验证无效、在某些情况下不检查证书身份、没有实验标志的无效 Rekor bundle 、无效的透明日志条目。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
sigstore cosign < 1.12.0 -

II. Public POCs for CVE-2022-36056

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III. Intelligence Information for CVE-2022-36056

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Patches & Fixes for CVE-2022-36056 (1)

Vendor Advisories for CVE-2022-36056 (1)

IV. Related Vulnerabilities

Same product: cosign
Same vendor: sigstore
Same weakness: CWE-347

V. Comments for CVE-2022-36056

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