Amazon Linux AMI update for nginx

Published: 2018-12-17 | Updated: 2018-12-17

Risk	Medium
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2018-16843 CVE-2018-16844
CWE-ID	CWE-399
Exploitation vector	Network
Public exploit	N/A
Vulnerable software Subscribe	Amazon Linux AMI Operating systems & Components / Operating system
Vendor	Amazon Web Services

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Resource management error

EUVDB-ID: #VU15745

Risk: Medium

CVSSv3.1: 5.2 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-16843

CWE-ID: CWE-399 - Resource Management Errors

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to excessive memory usage when processing HTTP/2 requests within the ngx_http_v2_module module. A remote attacker can send specially crafted HTTP/2 requests to the affected web server and consume all available memory on the system and perform a denial of service (DoS) attack.

Mitigation

Update the affected packages.

i686:
    nginx-mod-stream-1.14.1-2.34.amzn1.i686
    nginx-mod-http-geoip-1.14.1-2.34.amzn1.i686
    nginx-mod-http-xslt-filter-1.14.1-2.34.amzn1.i686
    nginx-debuginfo-1.14.1-2.34.amzn1.i686
    nginx-mod-http-perl-1.14.1-2.34.amzn1.i686
    nginx-mod-mail-1.14.1-2.34.amzn1.i686
    nginx-mod-http-image-filter-1.14.1-2.34.amzn1.i686
    nginx-all-modules-1.14.1-2.34.amzn1.i686
    nginx-1.14.1-2.34.amzn1.i686

src:
    nginx-1.14.1-2.34.amzn1.src

x86_64:
    nginx-all-modules-1.14.1-2.34.amzn1.x86_64
    nginx-mod-http-image-filter-1.14.1-2.34.amzn1.x86_64
    nginx-mod-http-perl-1.14.1-2.34.amzn1.x86_64
    nginx-debuginfo-1.14.1-2.34.amzn1.x86_64
    nginx-mod-http-geoip-1.14.1-2.34.amzn1.x86_64
    nginx-mod-mail-1.14.1-2.34.amzn1.x86_64
    nginx-1.14.1-2.34.amzn1.x86_64
    nginx-mod-stream-1.14.1-2.34.amzn1.x86_64
    nginx-mod-http-xslt-filter-1.14.1-2.34.amzn1.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

External links

http://alas.aws.amazon.com/ALAS-2018-1125.html

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

2) Resource management error

EUVDB-ID: #VU15744