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FreeBSD : OpenSSL -- Denial of Service vulnerability (b88aa380-1442-11ef-a490-84a93843eb75)

medium Nessus Plugin ID 197494

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Synopsis

The remote FreeBSD host is missing one or more security-related updates.

Description

The version of FreeBSD installed on the remote host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the b88aa380-1442-11ef-a490-84a93843eb75 advisory.

 - Issue summary: Checking excessively long DSA keys or parameters may be very slow. Impact summary:
 Applications that use the functions EVP_PKEY_param_check() or EVP_PKEY_public_check() to check a DSA public key or DSA parameters may experience long delays. Where the key or parameters that are being checked have been obtained from an untrusted source this may lead to a Denial of Service. The functions EVP_PKEY_param_check() or EVP_PKEY_public_check() perform various checks on DSA parameters. Some of those computations take a long time if the modulus (`p` parameter) is too large. Trying to use a very large modulus is slow and OpenSSL will not allow using public keys with a modulus which is over 10,000 bits in length for signature verification. However the key and parameter check functions do not limit the modulus size when performing the checks. An application that calls EVP_PKEY_param_check() or EVP_PKEY_public_check() and supplies a key or parameters obtained from an untrusted source could be vulnerable to a Denial of Service attack. These functions are not called by OpenSSL itself on untrusted DSA keys so only applications that directly call these functions may be vulnerable. Also vulnerable are the OpenSSL pkey and pkeyparam command line applications when 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 affected by this issue. (CVE-2024-4603)

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

Solution

Update the affected packages.

See Also

https://www.openssl.org/news/secadv/20240516.txt

http://www.nessus.org/u?dc6ba1a5

Plugin Details

Severity: Medium

ID: 197494

File Name: freebsd_pkg_b88aa380144211efa49084a93843eb75.nasl

Version: 1.1

Type: local

Published: 5/18/2024

Updated: 8/14/2024

Supported Sensors: 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:N/A:P

CVSS Score Source: CVE-2024-4603

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:N/A:L

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

Vulnerability Information

CPE: p-cpe:/a:freebsd:freebsd:openssl31, p-cpe:/a:freebsd:freebsd:openssl33, p-cpe:/a:freebsd:freebsd:openssl-quictls, cpe:/o:freebsd:freebsd, p-cpe:/a:freebsd:freebsd:openssl, p-cpe:/a:freebsd:freebsd:openssl31-quictls, p-cpe:/a:freebsd:freebsd:openssl32

Required KB Items: Host/local_checks_enabled, Host/FreeBSD/release, Host/FreeBSD/pkg_info

Exploit Ease: No known exploits are available

Patch Publication Date: 5/17/2024

Vulnerability Publication Date: 5/16/2024

Reference Information

CVE: CVE-2024-4603