Alibaba Cloud Linux 3 : 0016: nginx:1.20 (ALINUX3-SA-2022:0016)

high Nessus Plugin ID 236693

Synopsis

The remote Alibaba Cloud Linux host is missing one or more security updates.

Description

The remote Alibaba Cloud Linux 3 host has packages installed that are affected by multiple vulnerabilities as referenced in the ALINUX3-SA-2022:0016 advisory.

Package updates are available for Alibaba Cloud Linux 3 that fix the following vulnerabilities:

CVE-2019-9511:
Some HTTP/2 implementations are vulnerable to window size manipulation and stream prioritization manipulation, potentially leading to a denial of service. The attacker requests a large amount of data from a specified resource over multiple streams. They manipulate window size and stream priority to force the server to queue the data in 1-byte chunks. Depending on how efficiently this data is queued, this can consume excess CPU, memory, or both.

CVE-2019-9513:
Some HTTP/2 implementations are vulnerable to resource loops, potentially leading to a denial of service.
The attacker creates multiple request streams and continually shuffles the priority of the streams in a way that causes substantial churn to the priority tree. This can consume excess CPU.

CVE-2019-9516:
Some HTTP/2 implementations are vulnerable to a header leak, potentially leading to a denial of service.
The attacker sends a stream of headers with a 0-length header name and 0-length header value, optionally Huffman encoded into 1-byte or greater headers. Some implementations allocate memory for these headers and keep the allocation alive until the session dies. This can consume excess memory.

CVE-2021-23017:
A security issue in nginx resolver was identified, which might allow an attacker who is able to forge UDP packets from the DNS server to cause 1-byte memory overwrite, resulting in worker process crash or potential other impact.

Tenable has extracted the preceding description block directly from the Alibaba Cloud Linux security advisory.

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

Solution

Update the affected packages.

Plugin Details

Severity: High

ID: 236693

File Name: alinux3_sa_2022-0016.nasl

Version: 1.1

Type: local

Family: Alibaba Cloud Linux Local Security Checks

Published: 5/14/2025

Updated: 5/14/2025

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.3

CVSS v2

Risk Factor: Medium

Base Score: 6.8

Temporal Score: 5.3

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

CVSS Score Source: CVE-2021-23017

CVSS v3

Risk Factor: High

Base Score: 7.7

Temporal Score: 6.9

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

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

Vulnerability Information

CPE: p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:nginx-mod-http-perl, cpe:/o:alibabacloud:alibaba_cloud_linux_3, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:nginx-mod-mail, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:nginx-mod-http-image-filter, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:nginx-mod-http-xslt-filter-debuginfo, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:nginx-mod-http-perl-debuginfo, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:nginx-mod-stream-debuginfo, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:nginx-mod-mail-debuginfo, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:nginx-mod-stream, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:nginx-debugsource, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:nginx-debuginfo, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:nginx-all-modules, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:nginx-mod-http-xslt-filter, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:nginx, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:nginx-filesystem, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:nginx-mod-http-image-filter-debuginfo

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

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 3/17/2022

Vulnerability Publication Date: 8/9/2019

Reference Information

CVE: CVE-2019-9511, CVE-2019-9513, CVE-2019-9516, CVE-2021-23017

Detections

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