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CVE-2024-43485: Microsoft Security Advisory CVE-2024-43485 | .NET Denial of Service Vulnerability

October 8, 2024 (updated October 24, 2024)

Microsoft is releasing this security advisory to provide information about a vulnerability in System.Text.Json 6.0.x and 8.0.x. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability.

In System.Text.Json 6.0.x and 8.0.x, applications which deserialize input to a model with an [JsonExtensionData] property can be vulnerable to an algorithmic complexity attack resulting in Denial of Service.

References

  • github.com/advisories/GHSA-8g4q-xg66-9fp4
  • github.com/dotnet/announcements/issues/329
  • github.com/dotnet/runtime
  • github.com/dotnet/runtime/issues/108678
  • github.com/dotnet/runtime/security/advisories/GHSA-8g4q-xg66-9fp4
  • msrc.microsoft.com/update-guide/vulnerability/CVE-2024-43485
  • nvd.nist.gov/vuln/detail/CVE-2024-43485

Code Behaviors & Features

Detect and mitigate CVE-2024-43485 with GitLab Dependency Scanning

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Affected versions

All versions starting from 6.0.0 before 6.0.10, all versions starting from 8.0.0 before 8.0.5

Fixed versions

  • 8.0.5
  • 6.0.10

Solution

Upgrade to versions 6.0.10, 8.0.5 or above.

Impact 7.5 HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Learn more about CVSS

Weakness

  • CWE-407: Inefficient Algorithmic Complexity

Source file

nuget/System.Text.Json/CVE-2024-43485.yml

Spotted a mistake? Edit the file on GitLab.

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