CVE-2020-11080

 

Published at: - 04-06-2020 01:15

Last modified: - 29-08-2022 10:41

Total changes: - 10

Description

In nghttp2 before version 1.41.0, the overly large HTTP/2 SETTINGS frame payload causes denial of service. The proof of concept attack involves a malicious client constructing a SETTINGS frame with a length of 14,400 bytes (2400 individual settings entries) over and over again. The attack causes the CPU to spike at 100%. nghttp2 v1.41.0 fixes this vulnerability. There is a workaround to this vulnerability. Implement nghttp2_on_frame_recv_callback callback, and if received frame is SETTINGS frame and the number of settings entries are large (e.g., > 32), then drop the connection.

Common Vulnerability Scoring System (CVSS)

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

 

Verification logic

 

Reference

• https://github.com/nghttp2/nghttp2/commit/f8da73bd042f810f34d19f9eae02b46d870af394
• https://github.com/nghttp2/nghttp2/security/advisories/GHSA-q5wr-xfw9-q7xr
• https://github.com/nghttp2/nghttp2/commit/336a98feb0d56b9ac54e12736b18785c27f75090
• DSA-4696-Third Party Advisory
• openSUSE-SU-2020:0802-Mailing List, Third Party Advisory
• FEDORA-2020-f7d15c8b77-Third Party Advisory
• https://www.oracle.com/security-alerts/cpujul2020.html
• https://www.oracle.com/security-alerts/cpuoct2020.html
• FEDORA-2020-43d5a372fc-Third Party Advisory
• https://www.oracle.com/security-alerts/cpujan2021.html
• N/A-Not Applicable, Third Party Advisory
• [debian-lts-announce] 20211017 [SECURITY] [DLA 2786-1] nghttp2 security update-Mailing List, Third Party Advisory
• https://www.oracle.com/security-alerts/cpuapr2022.html

 

Keywords

NVD

 

CVE-2020-11080

 

CVE

 

Common vulnerabilities & exposures

 

CVSS

 

Common vulnerability scoring system

 

Security

 

Vulnerabilities

 

Exposures