Improper input validation in Microsoft Asp.net Model View Controller
CVE-2017-0247
A denial of service vulnerability exists when the ASP.NET Core fails to properly validate web requests. NOTE: Microsoft has not commented on third-party claims that the issue is that the TextEncoder.EncodeCore function in the System.Text.Encodings.Web package in ASP.NET Core Mvc before 1.0.4 and 1.1.x before 1.1.3 allows remote attackers to cause a denial of service by leveraging failure to properly calculate the length of 4-byte characters in the Unicode Non-Character range.
Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.
EPSS exploit prediction
EPSS: 0.169 (97.0th percentile), scored .
Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 97th percentile — 97.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.169 · newest: 0.169 · change: 0.000
Affected products
- Microsoft Asp.net Model View Controller — versions 1.0.0, 1.0.1, 1.0.2
- Microsoft Microsoft.aspnetcore.mvc.abstractions — versions 1.0.0, 1.0.1, 1.0.2
- Microsoft Microsoft.aspnetcore.mvc.apiexplorer — versions 1.0.0, 1.0.1, 1.0.2
- Microsoft Microsoft.aspnetcore.mvc.cors — versions 1.0.0, 1.0.1, 1.0.2
- Microsoft Microsoft.aspnetcore.mvc.dataannotations — versions 1.0.0, 1.0.1, 1.0.2
- Microsoft Microsoft.aspnetcore.mvc.formatters.json — versions 1.0.0, 1.0.1, 1.0.2
- Microsoft Microsoft.aspnetcore.mvc.formatters.xml — versions 1.0.0, 1.0.1, 1.0.2
- Microsoft Microsoft.aspnetcore.mvc.localization — versions 1.0.0, 1.0.1, 1.0.2
- Microsoft Microsoft.aspnetcore.mvc.razor — versions 1.0.0, 1.0.1, 1.0.2
- Microsoft Microsoft.aspnetcore.mvc.razor.host — versions 1.0.0, 1.0.1, 1.0.2
Weakness classification (CWE)
Public proof-of-concept exploits
References
- technet.microsoft.com/en-us/library/security/4021279.aspx (Patch, Vendor Advisory)
- github.com/aspnet/Announcements/issues/239 (Technical Description, Third Party Advisory)
- www.sidertia.com/Home/Community/Blog/2017/05/18/ASPNET-Core-Unicode-Non-Char-En… (Exploit, Third Party Advisory)
Frequently asked questions
- What is CVE-2017-0247?
- CVE-2017-0247 is a high-severity vulnerability in Microsoft Asp.net Model View Controller, classified under Improper Input Validation. CVSS score: 7.5/10. Published 2017-05-12.
- How severe is CVE-2017-0247?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2017-0247 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.