CVE-2017-5593 Psi Plus CVE debrief

Who should care

Psi+ users, administrators, and anyone relying on message sender identity in XMPP chats should care, especially if affected versions remain deployed in environments where chat-based trust is important.

Technical summary

The NVD record describes an incorrect implementation of XEP-0280 Message Carbons that allows a remote attacker to impersonate any user, including contacts, in the vulnerable application's display. The listed weakness types are CWE-20 and CWE-346, and the CVSS vector is AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N, indicating a network-reachable issue that primarily affects integrity rather than confidentiality or availability.

Defensive priority

Medium. Prioritize remediation if affected Psi+ builds are still in use, because the flaw can undermine trust in chat identity and enable convincing phishing or impersonation inside the client UI.

Recommended defensive actions

• Upgrade Psi+ to a version outside the affected range 0.16.563.580 through 0.16.571.627.
• Validate that the deployed build includes the patch referenced in the supplied corpus before relying on chat identity for sensitive workflows.
• Treat sender identity shown by vulnerable clients as potentially spoofable until remediation is complete.
• If upgrading is delayed, reduce reliance on client-displayed identities for approvals, account changes, or other trust-sensitive actions.

Evidence notes

The supplied NVD metadata says the issue is an incorrect implementation of XEP-0280 Message Carbons that allows remote impersonation in the application's display, with affected Psi+ versions explicitly listed as 0.16.563.580 and 0.16.571.627 endpoints in the vulnerable range. The record also provides CVSS 3.0 AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N and weaknesses CWE-20 and CWE-346. References in the corpus include a mailing-list disclosure, a patch commit, and a third-party technical advisory. One advisory URL in the supplied references uses CVE-2017-5589 in the path, which appears to be an identifier mismatch relative to this CVE record and should be treated cautiously.

Official resources