CVE-2020-1045
High
Description
<p>A security feature bypass vulnerability exists in the way Microsoft ASP.NET Core parses encoded cookie names.</p> <p>The ASP.NET Core cookie parser decodes entire cookie strings which could allow a malicious attacker to set a second cookie with the name being percent encoded.</p> <p>The security update addresses the vulnerability by fixing the way the ASP.NET Core cookie parser handles encoded names.</p>
SeverityHigh
CVSS7.5
Exploit probability—
Product
Microsoft Asp.net Core
PublishedSep 11, 2020
First seenSep 11, 2020
How to fix
Update
- microsoft asp.net_core3.1.8 or later
- Microsoft.AspNetCore.Http2.1.22 or later
- Microsoft.AspNetCore.App2.1.22 or later
- Microsoft.Owin4.1.1 or later
- Microsoft.AspNetCore.App.Runtime.linux-arm3.1.8 or later
- Microsoft.AspNetCore.App.Runtime.linux-arm643.1.8 or later
- Microsoft.AspNetCore.App.Runtime.linux-musl-x643.1.8 or later
- Microsoft.AspNetCore.App.Runtime.linux-x643.1.8 or later
- Microsoft.AspNetCore.App.Runtime.osx-x643.1.8 or later
- Microsoft.AspNetCore.App.Runtime.win-arm3.1.8 or later
- Microsoft.AspNetCore.App.Runtime.win-x643.1.8 or later
- Microsoft.AspNetCore.App.Runtime.win-x863.1.8 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| microsoft asp.net_core | 2.1 ≤ v ≤ 2.1.21, 3.1 ≤ v < 3.1.8 | 3.1.8 |
| fedoraproject fedora | 32, 33 | — |
| redhat enterprise_linux | 8.0 | — |
| redhat enterprise_linux_aus | 8.2, 8.4, 8.6 | — |
| redhat enterprise_linux_eus | 8.2, 8.4, 8.6 | — |
| redhat enterprise_linux_tus | 8.2, 8.4, 8.6 | — |
| Microsoft.AspNetCore.HttpNuGet | v < 2.1.22 | 2.1.22 |
| Microsoft.AspNetCore.AppNuGet | v < 2.1.22 | 2.1.22 |
| Microsoft.OwinNuGet | v < 4.1.1 | 4.1.1 |
| Microsoft.AspNetCore.App.Runtime.linux-armNuGet | 3.1.0 ≤ v < 3.1.8 | 3.1.8 |
| Microsoft.AspNetCore.App.Runtime.linux-arm64NuGet | 3.1.0 ≤ v < 3.1.8 | 3.1.8 |
| Microsoft.AspNetCore.App.Runtime.linux-musl-x64NuGet | 3.1.0 ≤ v < 3.1.8 | 3.1.8 |
| Microsoft.AspNetCore.App.Runtime.linux-x64NuGet | 3.1.0 ≤ v < 3.1.8 | 3.1.8 |
| Microsoft.AspNetCore.App.Runtime.osx-x64NuGet | 3.1.0 ≤ v < 3.1.8 | 3.1.8 |
| Microsoft.AspNetCore.App.Runtime.win-armNuGet | 3.1.0 ≤ v < 3.1.8 | 3.1.8 |
| Microsoft.AspNetCore.App.Runtime.win-x64NuGet | 3.1.0 ≤ v < 3.1.8 | 3.1.8 |
| Microsoft.AspNetCore.App.Runtime.win-x86NuGet | 3.1.0 ≤ v < 3.1.8 | 3.1.8 |
| Microsoft.AspNetCore.App.Runtime.linux-musl-arm64NuGet | 3.1.0 ≤ v < 3.1.8 | 3.1.8 |
| Microsoft.AspNetCore.App.Runtime.win-arm64NuGet | 3.1.5 ≤ v < 3.1.8 | 3.1.8 |
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