security config_error ai_generated true

Kubernetes 密钥因缺少编码或转义，通过 Pod 规范在环境变量中暴露

Kubernetes secret exposed in environment variable via pod spec due to missing encoding or escaping

ID: security/kubernetes-secret-exposed-in-environment-variable-via-pod-spec

其他格式: JSON · Markdown 中文 · English
89%修复率
83%置信度
1证据数
2024-11-01首次发现

版本兼容性

版本状态引入弃用备注
Kubernetes 1.29.0 active — — —
kubectl 1.29.0 active — — —
Helm 3.14.0 active — — —
Docker 25.0.0 active — — —

根因分析

Kubernetes 密钥值包含特殊字符（如 $、\、换行符），在 Pod 规范中注入到环境变量时未进行正确的编码或转义，导致 shell 或应用程序错误地解释该值，可能在日志或错误消息中泄露密钥。

English

A Kubernetes secret value containing special characters (e.g., $, \, newlines) is injected into an environment variable in the pod spec without proper encoding or escaping, causing the value to be interpreted incorrectly by the shell or application, potentially leaking the secret in logs or error messages.

generic

官方文档

https://kubernetes.io/docs/concepts/configuration/secret/

解决方案

  1. 在 Pod 规范中使用 `env` 字段和 `valueFrom` 及 `secretKeyRef` 直接注入密钥，避免 shell 解释。示例：`env:
- name: DB_PASSWORD
  valueFrom:
    secretKeyRef:
      name: db-secret
      key: password`。这确保值按原样传递，无需 shell 转义。
  2. 如果使用 Helm，确保在模板中对密钥值加引号以防止 YAML 解析问题。使用 `{{ .Values.secret.password | quote }}` 添加引号，并在 values 文件中使用反斜杠转义特殊字符。例如，包含 $ 的密码应为 `password: "pa\$sword"`。
  3. 使用专门的密钥管理工具，如 HashiCorp Vault 和 Vault Agent Injector，将密钥作为文件或环境变量注入，而无需在 Pod 规范中暴露。示例注解：`vault.hashicorp.com/agent-inject: "true"` 和 `vault.hashicorp.com/agent-inject-secret-db-password: "secret/data/db"`。

无效尝试

常见但无效的做法:

  1. Use a ConfigMap instead of a Secret for the environment variable 90% 失败

    ConfigMaps are not designed for sensitive data and store values in plain text. This actually increases the risk of exposure.

  2. Encode the secret value in base64 and decode it in the application 70% 失败

    Base64 is not encryption; it can be easily decoded by anyone with access to the pod spec or logs. This provides no real security.

  3. Remove special characters from the secret value 50% 失败

    This may break the application if the secret requires those characters (e.g., a password with $). It is not a general solution.