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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

The version of nghttp2 installed on the remote host is prior to 1.41.0-1. It is, therefore, affected by a vulnerability as referenced in the ALAS2-2020-1445 advisory.

 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)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Run 'yum update nghttp2' to update your system.

See Also

https://access.redhat.com/security/cve/CVE-2020-11080

https://alas.aws.amazon.com/AL2/ALAS-2020-1445.html

Plugin Details

Severity: High

ID: 138047

File Name: al2_ALAS-2020-1445.nasl

Version: 1.5

Type: local

Agent: unix

Published: 7/2/2020

Updated: 12/11/2024

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