envoyproxy envoy 对路径名的限制不恰当（路径遍历）
CVE编号
CVE-2021-29492利用情况
暂无补丁情况
N/A披露时间
2021-05-29漏洞描述
Envoy is a cloud-native edge/middle/service proxy. Envoy does not decode escaped slash sequences `%2F` and `%5C` in HTTP URL paths in versions 1.18.2 and before. A remote attacker may craft a path with escaped slashes, e.g. `/something%2F..%2Fadmin`, to bypass access control, e.g. a block on `/admin`. A backend server could then decode slash sequences and normalize path and provide an attacker access beyond the scope provided for by the access control policy. ### Impact Escalation of Privileges when using RBAC or JWT filters with enforcement based on URL path. Users with back end servers that interpret `%2F` and `/` and `%5C` and `\` interchangeably are impacted. ### Attack Vector URL paths containing escaped slash characters delivered by untrusted client. Patches in versions 1.18.3, 1.17.3, 1.16.4, 1.15.5 contain new path normalization option to decode escaped slash characters. As a workaround, if back end servers treat `%2F` and `/` and `%5C` and `\` interchangeably and a URL path based access control is configured, one may reconfigure the back end server to not treat `%2F` and `/` and `%5C` and `\` interchangeably.解决建议
建议您更新当前系统或软件至最新版，完成漏洞的修复。
参考链接 |
|
|---|---|
| https://github.com/envoyproxy/envoy/security/advisories/GHSA-4987-27fx-x6cf |
受影响软件情况
| # | 类型 | 厂商 | 产品 | 版本 | 影响面 | ||||
| 1 | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| 运行在以下环境 | |||||||||
| 应用 | envoyproxy | envoy | * | Up to (excluding) 1.15.5 | |||||
| 运行在以下环境 | |||||||||
| 应用 | envoyproxy | envoy | * | From (including) 1.16.0 | Up to (excluding) 1.16.4 | ||||
| 运行在以下环境 | |||||||||
| 应用 | envoyproxy | envoy | * | From (including) 1.17.0 | Up to (excluding) 1.17.3 | ||||
| 运行在以下环境 | |||||||||
| 应用 | envoyproxy | envoy | * | From (including) 1.18.0 | Up to (excluding) 1.18.3 | ||||
- 攻击路径 网络
- 攻击复杂度 低
- 权限要求 无
- 影响范围 未更改
- 用户交互 无
- 可用性 高
- 保密性 高
- 完整性 高
| CWE-ID | 漏洞类型 |
| CWE-22 | 对路径名的限制不恰当（路径遍历） |
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