CVE-2012-4672
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedApple iChat Server does not verify that a request was made for an XMPP Server Dialback response, which allows remote XMPP servers to spoof domains via responses for domains that were not asserted.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · high confidenceApple iChat Server fails to validate that XMPP Server Dialback responses correspond to legitimately initiated authentication requests. The server accepts any dialback response without verifying that a request was first made, allowing remote XMPP servers to spoof domains by sending fraudulent dialback responses for domains they do not control.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE dataall versionsCVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- M
- Authentication
- None
- Confidentiality
- Partial
- Integrity
- Partial
- Availability
- None
AV:N/AC:M/Au:N/C:P/I:P/A:N
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Identify if Apple iChat Server is installedCheck for the presence of iChat Server (also known as jabberd or the XMPP service) on the system. On Mac OS X Server, this may appear as a running process named 'jabberd' or as a configured XMPP service in Server Admin tools.Affected if Apple iChat Server is present and running on the system
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Verify if Server-to-Server (s2s) federation is enabledExamine the XMPP server configuration files (typically /etc/jabberd/jabberd.cfg or similar jabberd configuration files on Mac OS X Server) for the s2s or federation settings. Look for directives enabling server-to-server communication.Affected if s2s/federation is explicitly enabled in the XMPP configuration
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Confirm the XMPP service is accepting external connectionsCheck if the XMPP daemon is listening on port 5269 (the standard s2s port) or if firewall rules allow incoming connections to this port from external XMPP servers.Affected if Port 5269 is open and the server is accepting external s2s connections
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Inspect dialback configurationReview the jabberd configuration for dialback-related settings. In the server config, look for 'dialback' or 'verify' settings that control how dialback responses are validated.Affected if Dialback verification is either disabled or the configuration allows unauthenticated dialback responses
If Apple iChat Server is running with server-to-server (s2s) federation enabled, the server is affected by this vulnerability because it accepts fraudulent dialback responses without verifying prior authentication requests.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
From vendor dataDisable server-to-server (s2s) federation if not required, or upgrade to a patched version of the product. If s2s is required, implement additional transport-layer validation or consider deploying a reverse proxy with proper XMPP dialback verification.
- Consultation2.0 h
- Implementation2.0 h
- Testing1.0 h
- Review / QA1.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2012-4672 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2012-4672 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
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