Amazon Linux 2023 : openssl, openssl-devel, openssl-libs (ALAS2023-2023-306)

critical Nessus Plugin ID 180132

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Synopsis

The remote Amazon Linux 2023 host is missing a security update.

Description

It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2023-306 advisory.

Issue summary: The AES-SIV cipher implementation contains a bug that causesit to ignore empty associated data entries which are unauthenticated asa consequence.

Impact summary: Applications that use the AES-SIV algorithm and want toauthenticate empty data entries as associated data can be mislead by removingadding or reordering such empty entries as these are ignored by the OpenSSLimplementation. We are currently unaware of any such applications.

The AES-SIV algorithm allows for authentication of multiple associateddata entries along with the encryption. To authenticate empty data theapplication has to call EVP_EncryptUpdate() (or EVP_CipherUpdate()) withNULL pointer as the output buffer and 0 as the input buffer length.The AES-SIV implementation in OpenSSL just returns success for such a callinstead of performing the associated data authentication operation.The empty data thus will not be authenticated.

As this issue does not affect non-empty associated data authentication andwe expect it to be rare for an application to use empty associated dataentries this is qualified as Low severity issue. (CVE-2023-2975)

Issue summary: Checking excessively long DH keys or parameters may be very slow.

Impact summary: Applications that use the functions DH_check(), DH_check_ex()or EVP_PKEY_param_check() to check a DH key or DH parameters may experience longdelays. Where the key or parameters that are being checked have been obtainedfrom an untrusted source this may lead to a Denial of Service.

The function DH_check() performs various checks on DH parameters. One of thosechecks confirms that the modulus ('p' parameter) is not too large. Trying to usea very large modulus is slow and OpenSSL will not normally use a modulus whichis over 10,000 bits in length.

However the DH_check() function checks numerous aspects of the key or parametersthat have been supplied.
Some of those checks use the supplied modulus valueeven if it has already been found to be too large.

An application that calls DH_check() and supplies a key or parameters obtainedfrom an untrusted source could be vulernable to a Denial of Service attack.

The function DH_check() is itself called by a number of other OpenSSL functions.An application calling any of those other functions may similarly be affected.The other functions affected by this are DH_check_ex() andEVP_PKEY_param_check().

Also vulnerable are the OpenSSL dhparam and pkeyparam command line applicationswhen using the '-check' option.

The OpenSSL SSL/TLS implementation is not affected by this issue.The OpenSSL 3.0 and 3.1 FIPS providers are not affected by this issue. (CVE-2023-3446)

Issue summary: Checking excessively long DH keys or parameters may be very slow.

Impact summary: Applications that use the functions DH_check(), DH_check_ex()or EVP_PKEY_param_check() to check a DH key or DH parameters may experience longdelays. Where the key or parameters that are being checked have been obtainedfrom an untrusted source this may lead to a Denial of Service.

The function DH_check() performs various checks on DH parameters. After fixingCVE-2023-3446 it was discovered that a large q parameter value can also triggeran overly long computation during some of these checks. A correct q value,if present, cannot be larger than the modulus p parameter, thus it isunnecessary to perform these checks if q is larger than p.

An application that calls DH_check() and supplies a key or parameters obtainedfrom an untrusted source could be vulnerable to a Denial of Service attack.

The function DH_check() is itself called by a number of other OpenSSL functions.An application calling any of those other functions may similarly be affected.The other functions affected by this are DH_check_ex() andEVP_PKEY_param_check().

Also vulnerable are the OpenSSL dhparam and pkeyparam command line applicationswhen using the -check option.

The OpenSSL SSL/TLS implementation is not affected by this issue.

The OpenSSL 3.0 and 3.1 FIPS providers are not affected by this issue. (CVE-2023-3817)

Tenable has extracted the preceding description block directly from the tested product 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

Run 'dnf update openssl --releasever 2023.1.20230823' to update your system.

Plugin Details

Severity: Critical

ID: 180132

File Name: al2023_ALAS2023-2023-306.nasl

Version: 1.2

Type: local

Agent: unix

Family: Amazon Linux Local Security Checks

Published: 8/24/2023

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: 2.2

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.7

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

CVSS Score Source: CVE-2023-2975

CVSS v3

Risk Factor: Medium

Base Score: 5.3

Temporal Score: 4.6

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

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

CVSS v4

Risk Factor: Critical

Base Score: 9.3

Threat Score: 8.1

Threat Vector: CVSS:4.0/E:U

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CVSS Score Source: CVE-2023-3446

Vulnerability Information

CPE: p-cpe:/a:amazon:linux:openssl-debugsource, p-cpe:/a:amazon:linux:openssl-perl, p-cpe:/a:amazon:linux:openssl-libs-debuginfo, p-cpe:/a:amazon:linux:openssl-devel, p-cpe:/a:amazon:linux:openssl-debuginfo, p-cpe:/a:amazon:linux:openssl, cpe:/o:amazon:linux:2023, p-cpe:/a:amazon:linux:openssl-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: 8/17/2023

Vulnerability Publication Date: 7/7/2023

Reference Information

CVE: CVE-2023-2975, CVE-2023-3446, CVE-2023-3817

IAVA: 2023-A-0398-S

Detections

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