CVE-2020-11080

Denial of service in nghttp2

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.

Categories

3.7
CVSS
Severity: Low
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.57%
Vendor Advisory debian.org Vendor Advisory opensuse.org Vendor Advisory fedoraproject.org Vendor Advisory fedoraproject.org
Affected: nghttp2 nghttp2
Published at:
Updated at:

References

Link Tags
https://www.debian.org/security/2020/dsa-4696 third party advisory vendor advisory
http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00024.html vendor advisory third party advisory mailing list
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/AAC2AA36OTRHKSVM5OV7TTVB3CZIGEFL/ vendor advisory
https://www.oracle.com/security-alerts/cpujul2020.html third party advisory
https://github.com/nghttp2/nghttp2/security/advisories/GHSA-q5wr-xfw9-q7xr third party advisory patch
https://github.com/nghttp2/nghttp2/commit/336a98feb0d56b9ac54e12736b18785c27f75090 third party advisory patch
https://github.com/nghttp2/nghttp2/commit/f8da73bd042f810f34d19f9eae02b46d870af394 third party advisory patch
https://www.oracle.com/security-alerts/cpuoct2020.html third party advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4OOYAMJVLLCLXDTHW3V5UXNULZBBK4O6/ vendor advisory
https://www.oracle.com/security-alerts/cpujan2021.html third party advisory
https://www.oracle.com//security-alerts/cpujul2021.html third party advisory not applicable
https://lists.debian.org/debian-lts-announce/2021/10/msg00011.html third party advisory mailing list
https://www.oracle.com/security-alerts/cpuapr2022.html third party advisory patch
https://lists.debian.org/debian-lts-announce/2023/10/msg00023.html mailing list

Frequently Asked Questions

What is the severity of CVE-2020-11080?
CVE-2020-11080 has been scored as a low severity vulnerability.
How to fix CVE-2020-11080?
To fix CVE-2020-11080, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2020-11080 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2020-11080 is being actively exploited. According to its EPSS score, there is a ~1% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2020-11080?
CVE-2020-11080 affects nghttp2 nghttp2.
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