CVE-2018-8356

CVE-2018-8356 is a medium-severity security vulnerability in System.Private.ServiceModel (nuget), affecting versions >= 4.0.0, < 4.1.3. It is fixed in 4.1.3, 4.3.3, 4.4.4, 4.5.3, 4.0.4.

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Summary

Improper Certificate Validation in Microsoft .NET Framework components

A security feature bypass vulnerability exists when Microsoft .NET Framework components do not correctly validate certificates, aka ".NET Framework Security Feature Bypass Vulnerability." This affects .NET Framework 4.7.2, Microsoft .NET Framework 3.0, Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2, ASP.NET Core 1.1, Microsoft .NET Framework 4.5.2, ASP.NET Core 2.0, ASP.NET Core 1.0, .NET Core 1.1, Microsoft .NET Framework 3.5, Microsoft .NET Framework 3.5.1, Microsoft .NET Framework 4.6/4.6.1/4.6.2, .NET Core 1.0, .NET Core 2.0, Microsoft .NET Framework 4.6, Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.1/4.7.2, Microsoft .NET Framework 4.7.2.

Impact

CVE-2018-8356 has a CVSS score of 5.5 (Medium). The vector is requires local access, low privileges required, and no user interaction. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment. A fixed version is available (4.1.3, 4.3.3, 4.4.4, 4.5.3, 4.0.4); upgrading removes the vulnerable code path.

Affected versions

System.Private.ServiceModel (>= 4.0.0, < 4.1.3) System.Private.ServiceModel (>= 4.3.0, < 4.3.3) System.Private.ServiceModel (>= 4.4.0, < 4.4.4) System.Private.ServiceModel (>= 4.5.0, < 4.5.3) System.ServiceModel.Duplex (>= 4.3.0, < 4.3.3) System.ServiceModel.Duplex (>= 4.4.0, < 4.4.4) System.ServiceModel.Duplex (>= 4.5.0, < 4.5.3) System.ServiceModel.Http (>= 4.3.0, < 4.3.3) System.ServiceModel.Http (>= 4.4.0, < 4.4.4) System.ServiceModel.Http (>= 4.5.0, < 4.5.3) System.ServiceModel.Http (>= 4.0.0, < 4.1.3) System.ServiceModel.NetTcp (>= 4.3.0, < 4.3.3) System.ServiceModel.NetTcp (>= 4.4.0, < 4.4.4) System.ServiceModel.NetTcp (>= 4.5.0, < 4.5.3) System.ServiceModel.NetTcp (>= 4.0.0, < 4.1.3) System.ServiceModel.Primitives (>= 4.3.0, < 4.3.3) System.ServiceModel.Primitives (>= 4.4.0, < 4.4.4) System.ServiceModel.Primitives (>= 4.5.0, < 4.5.3) System.ServiceModel.Primitives (>= 4.0.0, < 4.1.3) System.ServiceModel.Security (>= 4.3.0, < 4.3.3) System.ServiceModel.Security (>= 4.4.0, < 4.4.4) System.ServiceModel.Security (>= 4.5.0, < 4.5.3) System.ServiceModel.Duplex (>= 4.0.0, <= 4.0.2) System.ServiceModel.Security (>= 4.0.0, <= 4.0.2)

Security releases

System.Private.ServiceModel → 4.1.3 (nuget) System.Private.ServiceModel → 4.3.3 (nuget) System.Private.ServiceModel → 4.4.4 (nuget) System.Private.ServiceModel → 4.5.3 (nuget) System.ServiceModel.Duplex → 4.3.3 (nuget) System.ServiceModel.Duplex → 4.4.4 (nuget) System.ServiceModel.Duplex → 4.5.3 (nuget) System.ServiceModel.Http → 4.3.3 (nuget) System.ServiceModel.Http → 4.4.4 (nuget) System.ServiceModel.Http → 4.5.3 (nuget) System.ServiceModel.Http → 4.1.3 (nuget) System.ServiceModel.NetTcp → 4.3.3 (nuget) System.ServiceModel.NetTcp → 4.4.4 (nuget) System.ServiceModel.NetTcp → 4.5.3 (nuget) System.ServiceModel.NetTcp → 4.1.3 (nuget) System.ServiceModel.Primitives → 4.3.3 (nuget) System.ServiceModel.Primitives → 4.4.4 (nuget) System.ServiceModel.Primitives → 4.5.3 (nuget) System.ServiceModel.Primitives → 4.1.3 (nuget) System.ServiceModel.Security → 4.3.3 (nuget) System.ServiceModel.Security → 4.4.4 (nuget) System.ServiceModel.Security → 4.5.3 (nuget) System.ServiceModel.Duplex → 4.0.4 (nuget) System.ServiceModel.Security → 4.0.4 (nuget)

Kodem intelligence

Severity tells you how bad this could be in the worst case. It does not tell you whether you are exposed. Exploitability and impact are functions of runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A vulnerable package can sit in your dependency tree and never run.

Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter. Kodem's runtime-powered SCA identifies whether this CVE is reachable in your applications.

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Remediation advice

Upgrade the following packages to resolve this vulnerability:

System.Private.ServiceModel to 4.1.3 or later; System.Private.ServiceModel to 4.3.3 or later; System.Private.ServiceModel to 4.4.4 or later; System.Private.ServiceModel to 4.5.3 or later; System.ServiceModel.Duplex to 4.3.3 or later; System.ServiceModel.Duplex to 4.4.4 or later; System.ServiceModel.Duplex to 4.5.3 or later; System.ServiceModel.Http to 4.3.3 or later; System.ServiceModel.Http to 4.4.4 or later; System.ServiceModel.Http to 4.5.3 or later; System.ServiceModel.Http to 4.1.3 or later; System.ServiceModel.NetTcp to 4.3.3 or later; System.ServiceModel.NetTcp to 4.4.4 or later; System.ServiceModel.NetTcp to 4.5.3 or later; System.ServiceModel.NetTcp to 4.1.3 or later; System.ServiceModel.Primitives to 4.3.3 or later; System.ServiceModel.Primitives to 4.4.4 or later; System.ServiceModel.Primitives to 4.5.3 or later; System.ServiceModel.Primitives to 4.1.3 or later; System.ServiceModel.Security to 4.3.3 or later; System.ServiceModel.Security to 4.4.4 or later; System.ServiceModel.Security to 4.5.3 or later; System.ServiceModel.Duplex to 4.0.4 or later; System.ServiceModel.Security to 4.0.4 or later

Kodem Kai can prioritize this vulnerability in your dependency tree and generate a fix recommendation.

Frequently Asked Questions

  1. What is CVE-2018-8356? CVE-2018-8356 is a medium-severity security vulnerability in System.Private.ServiceModel (nuget), affecting versions >= 4.0.0, < 4.1.3. It is fixed in 4.1.3, 4.3.3, 4.4.4, 4.5.3, 4.0.4.
  2. How severe is CVE-2018-8356? CVE-2018-8356 has a CVSS score of 5.5 (Medium). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
  3. Which packages are affected by CVE-2018-8356?
    • System.Private.ServiceModel (nuget) (versions >= 4.0.0, < 4.1.3)
    • System.ServiceModel.Duplex (nuget) (versions >= 4.3.0, < 4.3.3)
    • System.ServiceModel.Http (nuget) (versions >= 4.3.0, < 4.3.3)
    • System.ServiceModel.NetTcp (nuget) (versions >= 4.3.0, < 4.3.3)
    • System.ServiceModel.Primitives (nuget) (versions >= 4.3.0, < 4.3.3)
    • System.ServiceModel.Security (nuget) (versions >= 4.3.0, < 4.3.3)
  4. Is there a fix for CVE-2018-8356? Yes. CVE-2018-8356 is fixed in 4.1.3, 4.3.3, 4.4.4, 4.5.3, 4.0.4. Upgrade to this version or later.
  5. Is CVE-2018-8356 exploitable, and should I be worried? Whether CVE-2018-8356 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
  6. What actually determines whether CVE-2018-8356 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
  7. How do I fix CVE-2018-8356?
    • Upgrade System.Private.ServiceModel to 4.1.3 or later
    • Upgrade System.Private.ServiceModel to 4.3.3 or later
    • Upgrade System.Private.ServiceModel to 4.4.4 or later
    • Upgrade System.Private.ServiceModel to 4.5.3 or later
    • Upgrade System.ServiceModel.Duplex to 4.3.3 or later
    • Upgrade System.ServiceModel.Duplex to 4.4.4 or later
    • Upgrade System.ServiceModel.Duplex to 4.5.3 or later
    • Upgrade System.ServiceModel.Http to 4.3.3 or later
    • Upgrade System.ServiceModel.Http to 4.4.4 or later
    • Upgrade System.ServiceModel.Http to 4.5.3 or later
    • Upgrade System.ServiceModel.Http to 4.1.3 or later
    • Upgrade System.ServiceModel.NetTcp to 4.3.3 or later
    • Upgrade System.ServiceModel.NetTcp to 4.4.4 or later
    • Upgrade System.ServiceModel.NetTcp to 4.5.3 or later
    • Upgrade System.ServiceModel.NetTcp to 4.1.3 or later
    • Upgrade System.ServiceModel.Primitives to 4.3.3 or later
    • Upgrade System.ServiceModel.Primitives to 4.4.4 or later
    • Upgrade System.ServiceModel.Primitives to 4.5.3 or later
    • Upgrade System.ServiceModel.Primitives to 4.1.3 or later
    • Upgrade System.ServiceModel.Security to 4.3.3 or later
    • Upgrade System.ServiceModel.Security to 4.4.4 or later
    • Upgrade System.ServiceModel.Security to 4.5.3 or later
    • Upgrade System.ServiceModel.Duplex to 4.0.4 or later
    • Upgrade System.ServiceModel.Security to 4.0.4 or later

Other vulnerabilities in System.Private.ServiceModel

CVE-IDSeverityPackage summary
CVE-2018-0786HighMicrosoft.NETCore.UniversalWindowsPlatform: Improper Certificate Validation in Microsoft .NET Framework components

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