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CVE-2020-1045

HIGHCVSS 7.5/10EPSS 6.62%

Last modified

CVE-2020-1045 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. <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>. EPSS estimates a 6.62% chance of exploitation in the next 30 days.

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>

Metrics

CVSS 3.1
7.5/10

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

EPSS Probability
6.62%

93.0th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

VendorProductVersions
MicrosoftAsp.Net Core>= 2.1, <= 2.1.21
MicrosoftAsp.Net Core>= 3.1, < 3.1.8
FedoraprojectFedora32
FedoraprojectFedora33
RedhatEnterprise Linux8.0
RedhatEnterprise Linux Aus8.2
RedhatEnterprise Linux Aus8.4
RedhatEnterprise Linux Aus8.6
RedhatEnterprise Linux Eus8.2
RedhatEnterprise Linux Eus8.4
RedhatEnterprise Linux Eus8.6
RedhatEnterprise Linux Tus8.2
RedhatEnterprise Linux Tus8.4
RedhatEnterprise Linux Tus8.6

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2020-1045?
<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>
How severe is CVE-2020-1045?
CVE-2020-1045 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 6.62% probability of exploitation in the next 30 days.
How do I fix CVE-2020-1045?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-1045?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST