Vulnerability 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>
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Microsoft | Asp.Net Core | >= 2.1, <= 2.1.21 |
| Fedoraproject | Fedora | 32 |
| Redhat | Enterprise Linux | 8.0 |
| Redhat | Enterprise Linux Aus | 8.2 |
| Redhat | Enterprise Linux Eus | 8.2 |
| Redhat | Enterprise Linux Tus | 8.2 |
References
- https://access.redhat.com/errata/RHSA-2020:3699Third Party Advisory
- https://github.com/dotnet/core/blob/main/release-notes/3.1/3.1.8/3.1.8.md#changeRelease NotesThird Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1045PatchVendor Advisory
- https://security.snyk.io/vuln/SNYK-RHEL8-DOTNET-1439600Third Party Advisory
- https://access.redhat.com/errata/RHSA-2020:3699Third Party Advisory
- https://github.com/dotnet/core/blob/main/release-notes/3.1/3.1.8/3.1.8.md#changeRelease NotesThird Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1045PatchVendor Advisory
- https://security.snyk.io/vuln/SNYK-RHEL8-DOTNET-1439600Third Party Advisory
FAQ
What is CVE-2020-1045?
CVE-2020-1045 is a vulnerability with a CVSS score of 7.5 (HIGH). <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...
How severe is CVE-2020-1045?
CVE-2020-1045 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2020-1045?
Check the references section above for vendor advisories and patch information. Affected products include: Microsoft Asp.Net Core, Fedoraproject Fedora, Redhat Enterprise Linux, Redhat Enterprise Linux Aus, Redhat Enterprise Linux Eus.