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Amazon Linux AMI : python-ecdsa (ALAS-2023-1800)

critical Nessus Plugin ID 179799

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Synopsis

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

Description

It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS-2023-1800 advisory.

 - An error-handling flaw was found in python-ecdsa before version 0.13.3. During signature decoding, malformed DER signatures could raise unexpected exceptions (or no exceptions at all), which could lead to a denial of service. (CVE-2019-14853)

 - A flaw was found in all python-ecdsa versions before 0.13.3, where it did not correctly verify whether signatures used DER encoding. Without this verification, a malformed signature could be accepted, making the signature malleable. Without proper verification, an attacker could use a malleable signature to create false transactions. (CVE-2019-14859)

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

Solution

Run 'yum update python-ecdsa' to update your system.

See Also

https://alas.aws.amazon.com/ALAS-2023-1800.html

https://alas.aws.amazon.com/cve/html/CVE-2019-14853.html

https://alas.aws.amazon.com/cve/html/CVE-2019-14859.html

https://alas.aws.amazon.com/faqs.html

Plugin Details

Severity: Critical

ID: 179799

File Name: ala_ALAS-2023-1800.nasl

Version: 1.1

Type: local

Agent: unix

Published: 8/14/2023

Updated: 8/15/2023

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

Risk Information

VPR

Risk Factor: Medium

Score: 6.0

CVSS v2

Risk Factor: Medium

Base Score: 6.4

Temporal Score: 5

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

CVSS Score Source: CVE-2019-14859

CVSS v3

Risk Factor: Critical

Base Score: 9.1

Temporal Score: 8.2

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

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

Vulnerability Information

CPE: p-cpe:/a:amazon:linux:python27-ecdsa, cpe:/o:amazon:linux, p-cpe:/a:amazon:linux:python26-ecdsa

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

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 8/3/2023

Vulnerability Publication Date: 10/8/2019

Reference Information

CVE: CVE-2019-14853, CVE-2019-14859