Freeipa: delegation rules allow a proxy service to impersonate any user to access another target service

A vulnerability was found in FreeIPA in how the initial implementation of MS-SFU by MIT Kerberos was missing a condition for granting the "forwardable" flag on S4U2Self tickets. Fixing this mistake required adding a special case for the check_allowed_to_delegate() function: If the target service argument is NULL, then it means the KDC is probing for general constrained delegation rules and not checking a specific S4U2Proxy request. In FreeIPA 4.11.0, the behavior of ipadb_match_acl() was modified to match the changes from upstream MIT Kerberos 1.20. However, a mistake resulting in this mechanism applies in cases where the target service argument is set AND where it is unset. This results in S4U2Proxy requests being accepted regardless of whether or not there is a matching service delegation rule.

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

授权机制不正确

Red Hat FreeIPA 安全漏洞

Red Hat FreeIPA是一个综合安全信息管理解决方案。 FreeIPA 4.11.0版本存在安全漏洞，该漏洞源于缺少授予，导致无论是否符合规则的请求都会被接受。

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