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CVE-2023-27484— Unchecked fieldpath index in Composition's patches can lead to arbitrary memory allocation in crossplane

Quick assessment

Affected
crossplane crossplane
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.

crossplane是一个无需编写代码即可构建云原生控制平面的框架。 crossplane-runtime存在资源管理错误漏洞。攻击者利用该漏洞导致内存不足。

CVSS 6.2 · Medium EPSS 0.68% · P51

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking
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I. Basic Information for CVE-2023-27484

Vulnerability Information
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Vulnerability Title
Unchecked fieldpath index in Composition's patches can lead to arbitrary memory allocation in crossplane
Source: CVE Program / CVE List V5
Vulnerability Description
crossplane-runtime is a set of go libraries used to build Kubernetes controllers in Crossplane and its related stacks. In affected versions an already highly privileged user able to create or update Compositions can specify an arbitrarily high index in a patch's `ToFieldPath`, which could lead to excessive memory usage once such Composition is selected for a Composite resource. Compositions allow users to specify patches inserting elements into arrays at an arbitrary index. When a Composition is selected for a Composite Resource, patches are evaluated and if a specified index is greater than the current size of the target slice, Crossplane will grow that slice up to the specified index, which could lead to an excessive amount of memory usage and therefore the Pod being OOM-Killed. The index is already capped to the maximum value for a uint32 (4294967295) when parsed, but that is still an unnecessarily large value. This issue has been addressed in versions 1.11.2, 1.10.3, and 1.9.2. Users are advised to upgrade. Users unable to upgrade can restrict write privileges on Compositions to only admin users as a workaround.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
crossplane 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
crossplane是一个无需编写代码即可构建云原生控制平面的框架。 crossplane-runtime存在资源管理错误漏洞。攻击者利用该漏洞导致内存不足。
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
crossplane crossplane < 1.9.2 -

II. Public POCs for CVE-2023-27484

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III. Intelligence Information for CVE-2023-27484

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Vendor Advisories for CVE-2023-27484 (1)

IV. Related Vulnerabilities

Same product: crossplane
Same vendor: crossplane
Same weakness: CWE-400

V. Comments for CVE-2023-27484

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