Amazon Linux 2 : nghttp2 (ALAS-2020-1445)

high Nessus Plugin ID 138047

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Synopsis

The remote Amazon Linux 2 host is missing a security update.

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. (CVE-2020-11080)

Solution

Run 'yum update nghttp2' to update your system.

Plugin Details

Severity: High

ID: 138047

File Name: al2_ALAS-2020-1445.nasl

Version: 1.4

Type: local

Agent: unix

Family: Amazon Linux Local Security Checks

Published: 7/2/2020

Updated: 3/5/2024

Supported Sensors: Agentless Assessment, Continuous Assessment, Frictionless Assessment Agent, Frictionless Assessment AWS, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Low

Score: 3.6

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.7

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P

CVSS Score Source: CVE-2020-11080

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:amazon:linux:nghttp2-debuginfo, p-cpe:/a:amazon:linux:libnghttp2, cpe:/o:amazon:linux:2, p-cpe:/a:amazon:linux:nghttp2, p-cpe:/a:amazon:linux:libnghttp2-devel

Required KB Items: Host/local_checks_enabled, Host/AmazonLinux/release, Host/AmazonLinux/rpm-list

Exploit Ease: No known exploits are available

Patch Publication Date: 7/1/2020

Vulnerability Publication Date: 6/3/2020

Reference Information

CVE: CVE-2020-11080

ALAS: 2020-1445

Detections

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