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Yuko YukoApplication · Yukoyuko

CVE-2014-5323

MEDIUM · 5.4 CVSS v2.0 Published 2014-09-24
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
59/100
Remediation priority · Elevated
No privileges Zero-click

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 · unedited
The Yuko Yuko (aka jp.co.yukoyuko.android.yukoyuko_android) application 1.0.5 and earlier for Android 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 confidence

The Yuko Yuko Android application versions 1.0.5 and earlier fails to validate X.509 certificates from SSL servers, allowing man-in-the-middle attackers to intercept encrypted communications by presenting fraudulent certificates and spoof legitimate servers to steal sensitive data.

MitigationImplement proper SSL/TLS certificate validation in the application, preferably through certificate pinning to bind the app to trusted certificates and prevent MITM attacks.

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
Yuko YukoApplication
Affected:= 1.0.5

CVSS 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
Adjacent
Complexity
M
Authentication
None
Confidentiality
Partial
Integrity
Partial
Availability
Partial

AV:A/AC:M/Au:N/C:P/I:P/A:P

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 checks

Work through these to decide whether this CVE applies to you.

  1. Identify installed Yuko Yuko app version
    On the Android device, go to Settings > Apps > find Yuko Yuko and view the Version information, or use ADB command: adb shell pm list packages | grep -i yuko then adb shell dumpsys package <package_name> | grep versionName
    Affected if The displayed version is 1.0.5 or any version number lower than 1.0.5 (such as 1.0.4, 1.0.3, 1.0.2, 1.0.1, 1.0.0)
  2. Confirm app uses network communication
    Review app permissions and network traffic. Check if the app has INTERNET permission in its manifest (AndroidManifest.xml), or monitor network connections using a packet capture tool while the app is in use
    Affected if The app has INTERNET permission and communicates over network, making it capable of transmitting sensitive data over SSL/TLS connections

You are affected if the Yuko Yuko Android app installed on your device is version 1.0.5 or earlier and the app transmits data over network connections, since the application does not validate SSL certificates allowing potential interception of encrypted traffic.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

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 data
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Implement proper SSL/TLS certificate validation in the application, preferably through certificate pinning to bind the app to trusted certificates and prevent MITM attacks.

Fix this in Yuko Yuko Scoped from the published advisory
  • Consultation2.0 h
  • Implementation6.0 h
  • Testing3.0 h
  • Review / QA2.0 h
13.0 hours of engineering $2,290
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2014-5323 in production — separate from our analysis above.

No notes yet

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • 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