dena h2o 对未经初始化资源的使用

CVE编号

CVE-2021-43848

利用情况

暂无

补丁情况

N/A

披露时间

2022-02-01

漏洞描述

h2o is an open source http server. In code prior to the `8c0eca3` commit h2o may attempt to access uninitialized memory. When receiving QUIC frames in certain order, HTTP/3 server-side implementation of h2o can be misguided to treat uninitialized memory as HTTP/3 frames that have been received. When h2o is used as a reverse proxy, an attacker can abuse this vulnerability to send internal state of h2o to backend servers controlled by the attacker or third party. Also, if there is an HTTP endpoint that reflects the traffic sent from the client, an attacker can use that reflector to obtain internal state of h2o. This internal state includes traffic of other connections in unencrypted form and TLS session tickets. This vulnerability exists in h2o server with HTTP/3 support, between commit 93af138 and d1f0f65. None of the released versions of h2o are affected by this vulnerability. There are no known workarounds. Users of unreleased versions of h2o using HTTP/3 are advised to upgrade immediately.

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/h2o/h2o/commit/8c0eca3
https://github.com/h2o/h2o/security/advisories/GHSA-f9xw-j925-m4m4

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	dena	h2o	*		Up to (excluding) 2021-12-20

CVSS3评分 5.9

• 攻击路径 网络
• 攻击复杂度 高
• 权限要求 无
• 影响范围 未更改
• 用户交互 无
• 可用性 无
• 保密性 高
• 完整性 无

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N CWE-ID 漏洞类型 CWE-908 对未经初始化资源的使用