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CVE-2024-51746— Use of incorrect Rekor entries during verification in gitsign

Quick assessment

Affected
sigstore gitsign
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.

Gitsign是Gitsign个人开发者的一个能够免密钥完成对Git提交进行签名的工具。 Gitsign存在安全漏洞，该漏洞源于没有额外的验证来确保条目的哈希值与正在验证的有效载荷匹配。

AI Predicted 4.3 Difficulty: Hard EPSS 0.12% · P2

Possible ATT&CK Techniques 1 AI

T1553.005 · Mark-of-the-Web Bypass
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I. Basic Information for CVE-2024-51746

Vulnerability Information
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Vulnerability Title
Use of incorrect Rekor entries during verification in gitsign
Source: CVE Program / CVE List V5
Vulnerability Description
Gitsign is a keyless Sigstore to signing tool for Git commits with your a GitHub / OIDC identity. gitsign may select the wrong Rekor entry to use during online verification when multiple entries are returned by the log. gitsign uses Rekor's search API to fetch entries that apply to a signature being verified. The parameters used for the search are the public key and the payload. The search API returns entries that match either condition rather than both. When gitsign's credential cache is used, there can be multiple entries that use the same ephemeral keypair / signing certificate. As gitsign assumes both conditions are matched by Rekor, there is no additional validation that the entry's hash matches the payload being verified, meaning that the wrong entry can be used to successfully pass verification. Impact is minimal as while gitsign does not match the payload against the entry, it does ensure that the certificate matches. This would need to be exploited during the certificate validity window (10 minutes) by the key holder.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:H/AT:P/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
使用不正确的解析名称或索引
Source: CVE Program / CVE List V5
Vulnerability Title
Gitsign 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Gitsign是Gitsign个人开发者的一个能够免密钥完成对Git提交进行签名的工具。 Gitsign存在安全漏洞，该漏洞源于没有额外的验证来确保条目的哈希值与正在验证的有效载荷匹配。
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 gitsign < 0.11.0 -

II. Public POCs for CVE-2024-51746

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III. Intelligence Information for CVE-2024-51746

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IV. Related Vulnerabilities

Same product: gitsign
Same vendor: sigstore
Same weakness: CWE-706

V. Comments for CVE-2024-51746

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