Improper Verification of Cryptographic Signature in wire-server

wire-server provides back end services for Wire, an open source messenger. In versions of wire-server prior to the 2022-01-27 release, it was possible to craft DSA Signatures to bypass SAML SSO and impersonate any Wire user with SAML credentials. In teams with SAML, but without SCIM, it was possible to create new accounts with fake SAML credentials. Under certain conditions that can be established by an attacker, an upstream library for parsing, rendering, signing, and validating SAML XML data was accepting public keys as trusted that were provided by the attacker in the signature. As a consequence, the attacker could login as any user in any Wire team with SAML SSO enabled. If SCIM was not enabled, the attacker could also create new users with new SAML NameIDs. In order to exploit this vulnerability, the attacker needs to know the SSO login code (distributed to all team members with SAML credentials and visible in the Team Management app), the SAML EntityID identifying the IdP (a URL not considered sensitive, but usually hard to guess, also visible in Team Management), and the SAML NameID of the user (usually an email address or a nick). The issue has been fixed in wire-server `2022-01-27` and is already deployed on all Wire managed services. On premise instances of wire-server need to be updated to `2022-01-27`, so that their backends are no longer affected. There are currently no known workarounds. More detailed information about how to reproduce the vulnerability and mitigation strategies is available in the GitHub Security Advisory.

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

密码学签名的验证不恰当

Wire 数据伪造问题漏洞

Wire是德国Wire公司的一款聊天软件。该软件支持 Web、WindowsiOS、Android、OS X 平台，有群组功能，可以语音通话，发送照片以及其独创性的打招呼方式 PING。 Wire Wire-server 存在数据伪造问题漏洞，该漏洞源于可以制作 DSA 签名以绕过 SAML SSO 并使用 SAML 凭据模拟任何 Wire 用户。在使用 SAML 但没有 SCIM 的团队中，可以使用伪造的 SAML 凭据创建新帐户。在攻击者可以建立的特定条件下，用于解析、呈现、签名和验证 SAML XM

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