CVE-2017-9576
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 · uneditedThe "Middleton Community Bank Mobile Banking" by Middleton Community Bank app 3.0.0 -- aka middleton-community-bank-mobile-banking/id721843238 for iOS does not verify X.509 certificates from SSL servers, which allows man-in-the-middle attackers to spoof servers and obtain sensitive information via a crafted certificate.
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 confidenceThe Middleton Community Bank Mobile Banking iOS app version 3.0.0 fails to validate X.509 certificates from SSL servers, allowing man-in-the-middle attackers to intercept encrypted communications by presenting a crafted certificate. This enables credential theft and session hijacking.
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 data= 3.0.0CVSS 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
- High
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- None
- Availability
- None
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/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 the installed app versionOn iOS device: Go to Settings > General > iPhone Storage (or iPad Storage), find Middleton Community Bank Mobile Banking, and note the version number displayed. Alternatively, open App Store, tap your profile icon, tap Purchased, find the app, and check the version.Affected if The installed version is exactly 3.0.0
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Test SSL certificate validation with untrusted certificateConfigure a network proxy tool (such as Burp Suite, Charles Proxy, or OWASP ZAP) on a separate machine. Install the proxy's CA certificate as trusted on the iOS device. Route the device's traffic through the proxy. Attempt to intercept traffic destined for the bank's servers.Affected if The app successfully establishes connections and transmits data even when an invalid or self-signed certificate is presented by the proxy, indicating no certificate validation occurs
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Inspect network layer for certificate validation codeIf the app binary or source code is available, examine the network implementation. Search for NSURLSession, NSURLConnection, or third-party networking libraries. Look for whether NSURLSessionConfiguration's URLCredential methods or certificate pinning delegates are implemented. Check if SecTrustEvaluate or similar certificate chain validation functions are called.Affected if The network code lacks certificate pinning implementation and contains no calls to validate X.509 certificate chains before accepting connections
You are affected if the installed version is exactly 3.0.0 AND the app accepts connections with invalid certificates during MITM proxy testing, demonstrating that certificate validation is not enforced.
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 dataImplement proper SSL/TLS certificate validation using certificate pinning or standard X.509 chain verification within the iOS application's network layer.
- Consultation4.0 h
- Implementation16.0 h
- Testing8.0 h
- Review / QA4.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $8,960.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2017-9576 — 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-2017-9576 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
- No spam, self-promotion, credentials, or personal data