CVE-2024-21319HighCVSS 6.8

Microsoft Identity Denial of service vulnerability

Published
January 9, 2024
Last Modified
—

🔗 CVE IDs covered (1)

CVE-2024-21319 →

📋 Description

According to the CVSS metric, privileges required is high (PR:H). What does that mean for this vulnerability? The attacker must have access to the public encrypt key registered with the IDP(Entra ID) for successful exploitation.

How could an attacker exploit this vulnerability? An attacker could exploit this vulnerability by crafting a malicious JSON Web Encryption (JWE) token with a high compression ratio. This token, when processed by a server, leads to excessive memory allocation and processing time during decompression, causing a denial-of-service (DoS) condition. It's important to note that the attacker must have access to the public key registered with the IDP(AAD) for successful exploitation.

According to the CVSS metric, a successful exploitation could lead to a scope change (S:C). What does this mean for this vulnerability? A scope change (S:C) in the CVSS metric indicates that successful exploitation of this vulnerability could extend beyond the immediate processing of malicious tokens, affecting the overall availability of the system by causing a denial-of-service (DoS) condition.

🎯 Affected products13

  • .NET 6.0
  • .NET 7.0
  • .NET 8.0
  • Microsoft Identity Model v5.0.0
  • Microsoft Identity Model v5.0.0 for Nuget
  • Microsoft Identity Model v6.0.0
  • Microsoft Identity Model v6.0.0 for Nuget
  • Microsoft Identity Model v7.0.0
  • Microsoft Identity Model v7.0.0 for Nuget
  • Microsoft Visual Studio 2022 version 17.2
  • Microsoft Visual Studio 2022 version 17.4
  • Microsoft Visual Studio 2022 version 17.6
  • Microsoft Visual Studio 2022 version 17.8

✅ Remediation

KB5033733 (Security Update) — fixed build 6.0.26 KBRelease Notes (Security Update) — fixed build 17.2.23 KBRelease Notes (Security Update) — fixed build 17.6.11 KBRelease Notes (Security Update) — fixed build 17.4.15 KBRelease Notes (Security Update) — fixed build 17.8.4 KB5033734 (Security Update) — fixed build 7.0.15 KB5033741 (Security Update) — fixed build 8.0.1 KBRelease Notes (Security Update) — fixed build 6.34.0 KBRelease Notes (Security Update) — fixed build 7.1.2 KBRelease Notes (Security Update) — fixed build 5.7.0

🔗 References (14)