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Amazon Linux AMI : python-rsa (ALAS-2020-1421)

high Nessus Plugin ID 140090

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Synopsis

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

Description

It is, therefore, affected by a vulnerability as referenced in the ALAS-2020-1421 advisory.

 Python-RSA before 4.1 ignores leading '\0' bytes during decryption of ciphertext. This could conceivably have a security-relevant impact, e.g., by helping an attacker to infer that an application uses Python- RSA, or if the length of accepted ciphertext affects application behavior (such as by causing excessive memory allocation). A flaw was found in the python-rsa package, where it does not explicitly check the ciphertext length against the key size and ignores the leading 0 bytes during the decryption of the ciphertext. This flaw allows an attacker to perform a ciphertext attack, leading to a denial of service.
 The highest threat from this vulnerability is to confidentiality. (CVE-2020-13757)

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 python-rsa' to update your system.

See Also

https://alas.aws.amazon.com/ALAS-2020-1421.html

https://access.redhat.com/security/cve/CVE-2020-13757

Plugin Details

Severity: High

ID: 140090

File Name: ala_ALAS-2020-1421.nasl

Version: 1.3

Type: local

Agent: unix

Published: 8/31/2020

Updated: 12/11/2024

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

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.9

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

CVSS Score Source: CVE-2020-13757

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.7

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

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

Vulnerability Information

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

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: 8/26/2020

Vulnerability Publication Date: 6/1/2020

Reference Information

CVE: CVE-2020-13757

ALAS: 2020-1421