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CVE-2024-39897— Cache driver GetBlob() allows read access to any blob without access control check

Quick assessment

Affected
project-zot zot
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.

zot是The zot Project开源的一个 OCI 图像注册表。 zot 2.1.0之前版本存在安全漏洞，该漏洞源于缓存驱动程序GetBlob()允许对任何blob进行读取访问，而无需进行访问控制检查。

CVSS 4.3 · Medium EPSS 0.30% · P20

Possible ATT&CK Techniques 1 AI

T1005 · Data from Local System
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I. Basic Information for CVE-2024-39897

Vulnerability Information
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Vulnerability Title
Cache driver GetBlob() allows read access to any blob without access control check
Source: CVE Program / CVE List V5
Vulnerability Description
zot is an OCI image registry. Prior to 2.1.0, the cache driver `GetBlob()` allows read access to any blob without access control check. If a Zot `accessControl` policy allows users read access to some repositories but restricts read access to other repositories and `dedupe` is enabled (it is enabled by default), then an attacker who knows the name of an image and the digest of a blob (that they do not have read access to), they may maliciously read it via a second repository they do have read access to. This attack is possible because [`ImageStore.CheckBlob()` calls `checkCacheBlob()`](https://github.com/project-zot/zot/blob/v2.1.0-rc2/pkg/storage/imagestore/imagestore.go#L1158-L1159) to find the blob a global cache by searching for the digest. If it is found, it is copied to the user requested repository with `copyBlob()`. The attack may be mitigated by configuring "dedupe": false in the "storage" settings. The vulnerability is fixed in 2.1.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过用户控制密钥绕过授权机制
Source: CVE Program / CVE List V5
Vulnerability Title
zot 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
zot是The zot Project开源的一个 OCI 图像注册表。 zot 2.1.0之前版本存在安全漏洞，该漏洞源于缓存驱动程序GetBlob()允许对任何blob进行读取访问，而无需进行访问控制检查。
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
project-zot zot < 2.1.0 -

II. Public POCs for CVE-2024-39897

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III. Intelligence Information for CVE-2024-39897

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Patches & Fixes for CVE-2024-39897 (1)

Vendor Advisories for CVE-2024-39897 (1)

IV. Related Vulnerabilities

Same product: zot
Same vendor: project-zot
Same weakness: CWE-639

V. Comments for CVE-2024-39897

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