#VU64730 Resource exhaustion in Microsoft .NET Core - CVE-2019-0820

Vulnerability identifier: #VU64730

Vulnerability risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2019-0820

CWE-ID: CWE-400

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Microsoft .NET Core
Server applications / Frameworks for developing and running applications

Vendor: Microsoft

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists when .NET Framework and .NET Core improperly process RegEx strings. A remote attacker can trigger resource exhaustion and perform a denial of service (DoS) attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Microsoft .NET Core: 1.0, 1.1, 2.1, 2.2

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External links
https://access.redhat.com/errata/RHSA-2019:1259
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-0820

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.