CVE-2022-23610 Information

Description

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 Vector

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

Reference

https://github.com/wireapp/wire-server/releases/tag/v2022-01-27 https://github.com/wireapp/wire-server/security/advisories/GHSA-9jg9-9g37-4424

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

HIGH

Base Severity

8.1