CVE-2017-0247

Description

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.

How to fix CVE-2017-0247

To remediate CVE-2017-0247, upgrade the affected package to a fixed version below.

• —upgrade to 1.0.4 or later
• —upgrade to 1.0.4 or later
• —upgrade to 1.0.4 or later
• —upgrade to 1.0.4 or later
• —upgrade to 1.0.4 or later
• —upgrade to 1.0.4 or later
• —upgrade to 1.0.4 or later
• —upgrade to 1.0.4 or later
• —upgrade to 1.0.4 or later
• —upgrade to 1.0.4 or later
• —upgrade to 1.0.4 or later
• —upgrade to 1.0.4 or later
• —upgrade to 1.0.4 or later
• —upgrade to 1.0.4 or later

Is CVE-2017-0247 being exploited?

Moderate — EPSS is 11.1%. Track this CVE but it's not at the top of the prioritisation list.

Affected packages (19)

• >= 1.0.0, < 1.0.4
• >= 1.0.0, < 1.0.4
• >= 1.0.0, < 1.0.4
• >= 1.0.0, < 1.0.4
• >= 1.0.0, < 1.0.4
• >= 1.0.0, < 1.0.4
• >= 1.0.0, < 1.0.4
• >= 1.0.0, < 1.0.4
• >= 1.0.0, < 1.0.4

CVSS scores

References (5)

• ADVISORYgithub.com/advisories/GHSA-6xh7-4v2w-36q6
• ADVISORYnvd.nist.gov/vuln/detail/CVE-2017-0247
• WEBgithub.com/aspnet/Announcements/issues/239
• WEBtechnet.microsoft.com/en-us/library/security/4021279.aspx