openbsd openssh 认证机制不恰当

CVE编号

CVE-2021-36368

利用情况

暂无

补丁情况

N/A

披露时间

2022-03-13

漏洞描述

** DISPUTED ** An issue was discovered in OpenSSH before 8.9. If a client is using public-key authentication with agent forwarding but without -oLogLevel=verbose, and an attacker has silently modified the server to support the None authentication option, then the user cannot determine whether FIDO authentication is going to confirm that the user wishes to connect to that server, or that the user wishes to allow that server to connect to a different server on the user's behalf. NOTE: the vendor's position is "this is not an authentication bypass, since nothing is being bypassed."

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://bugzilla.mindrot.org/show_bug.cgi?id=3316
https://docs.ssh-mitm.at/trivialauth.html
https://github.com/openssh/openssh-portable/pull/258
https://security-tracker.debian.org/tracker/CVE-2021-36368
https://www.openssh.com/security.html

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	openbsd	openssh	*		Up to (excluding) 8.9
	运行在以下环境
	系统	debian_10	openssh	*		Up to (excluding) 7.9p1-10+deb10u2
	运行在以下环境
	系统	debian_11	openssh	*		Up to (excluding) 8.4p1-5
	运行在以下环境
	系统	debian_9	openssh	*		Up to (excluding) 7.4p1-10+deb9u7

CVSS3评分 3.7

• 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 低
• 完整性 无

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N CWE-ID 漏洞类型 CWE-287 认证机制不恰当