Vulnerability in Microsoft Asp.net Core
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>
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.
EPSS exploit prediction
EPSS: 0.059 (93.2th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 93rd percentile — 93.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.059 · newest: 0.059 · change: 0.000
Affected products
- Microsoft Asp.net Core
- Microsoft Asp.net Core 2.1 — versions 2.0
- Microsoft Asp.net Core 3.1 — versions 3.0
- Fedoraproject Fedora — versions 32, 33
- Red Hat Enterprise Linux — versions 8.0
- Red Hat Enterprise Linux Aus — versions 8.2, 8.4, 8.6
- Red Hat Enterprise Linux Eus — versions 8.2, 8.4, 8.6
- Red Hat Enterprise Linux Tus — versions 8.2, 8.4, 8.6
Public proof-of-concept exploits
References
- portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1045 (Patch, Vendor Advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- github.com/dotnet/core/blob/main/release-notes/3.1/3.1.8/3.1.8.md (Third Party Advisory, Release Notes)
- security.snyk.io/vuln/SNYK-RHEL8-DOTNET-1439600 (Third Party Advisory)
- access.redhat.com/errata/RHSA-2020:3699 (Third Party Advisory)
Frequently asked questions
- What is CVE-2020-1045?
- CVE-2020-1045 is a high-severity vulnerability in Microsoft Asp.net Core. CVSS score: 7.5/10. Published 2020-09-11.
- How severe is CVE-2020-1045?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2020-1045 known to be exploited?
- 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.