CVE-2022-23610: Improper Verification of Cryptographic Signature in wire-server
First published: Wed Mar 16 2022(Updated: )
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.
Credit: security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Wire Wire-server | <2.123.0 |
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Reference Links
Frequently Asked Questions
What is CVE-2022-23610?
CVE-2022-23610 is a vulnerability that affects wire-server, a back end service for the Wire messenger.
What is the severity of CVE-2022-23610?
The severity of CVE-2022-23610 is critical with a CVSS score of 8.1.
How does CVE-2022-23610 impact wire-server users?
CVE-2022-23610 allows attackers to bypass SAML SSO and impersonate any Wire user with SAML credentials, potentially compromising the security of affected wire-server installations.
How can I fix CVE-2022-23610?
To fix CVE-2022-23610, users should update wire-server to version 2.123.0 or later, which contains the necessary security patches.
Where can I find more information about CVE-2022-23610?
More information about CVE-2022-23610 can be found in the official GitHub release and security advisory.
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