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.
Published 2022-03-16 18:15:12
Updated 2022-03-28 16:28:54
Source GitHub, Inc.
View at NVD,   CVE.org

Exploit prediction scoring system (EPSS) score for CVE-2022-23610

Probability of exploitation activity in the next 30 days EPSS Score History
~ 58 %
Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2022-23610

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Score Source First Seen
GitHub, Inc.

CWE ids for CVE-2022-23610

References for CVE-2022-23610

Products affected by CVE-2022-23610

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