Amazon Linux 2 : openssl11 (ALAS-2024-2564)

medium Nessus Plugin ID 200379

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Synopsis

The remote Amazon Linux 2 host is missing a security update.

Description

The version of openssl11 installed on the remote host is prior to 1.1.1g-12. It is, therefore, affected by a vulnerability as referenced in the ALAS2-2024-2564 advisory.

Issue summary: Some non-default TLS server configurations can cause unboundedmemory growth when processing TLSv1.3 sessions

Impact summary: An attacker may exploit certain server configurations to triggerunbounded memory growth that would lead to a Denial of Service

This problem can occur in TLSv1.3 if the non-default SSL_OP_NO_TICKET option isbeing used (but not if early_data support is also configured and the defaultanti-replay protection is in use). In this case, under certain conditions, thesession cache can get into an incorrect state and it will fail to flush properlyas it fills. The session cache will continue to grow in an unbounded manner. Amalicious client could deliberately create the scenario for this failure toforce a Denial of Service. It may also happen by accident in normal operation.

This issue only affects TLS servers supporting TLSv1.3. It does not affect TLSclients.

The FIPS modules in 3.2, 3.1 and 3.0 are not affected by this issue. OpenSSL1.0.2 is also not affected by this issue. (CVE-2024-2511)

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 openssl11' to update your system.

Plugin Details

Severity: Medium

ID: 200379

File Name: al2_ALAS-2024-2564.nasl

Version: 1.2

Type: local

Agent: unix

Family: Amazon Linux Local Security Checks

Published: 6/12/2024

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: 3.4

CVSS v2

Risk Factor: Medium

Base Score: 5.1

Temporal Score: 3.8

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

CVSS Score Source: CVE-2024-2511

CVSS v3

Risk Factor: Medium

Base Score: 5.6

Temporal Score: 4.9

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

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

Vulnerability Information

CPE: p-cpe:/a:amazon:linux:openssl11, p-cpe:/a:amazon:linux:openssl11-debuginfo, p-cpe:/a:amazon:linux:openssl11-devel, p-cpe:/a:amazon:linux:openssl11-static, cpe:/o:amazon:linux:2, p-cpe:/a:amazon:linux:openssl11-libs

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

Exploit Ease: No known exploits are available

Patch Publication Date: 6/6/2024

Vulnerability Publication Date: 4/8/2024

Reference Information

CVE: CVE-2024-2511

IAVA: 2024-A-0208-S

Detections

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