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FreeBSD : OpenSSL -- Unbounded memory growth with session handling in TLSv1.3 (7c217849-f7d7-11ee-a490-84a93843eb75)

medium Nessus Plugin ID 193185

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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 7c217849-f7d7-11ee-a490-84a93843eb75 advisory.

 - Issue summary: Some non-default TLS server configurations can cause unbounded memory growth when processing TLSv1.3 sessions Impact summary: An attacker may exploit certain server configurations to trigger unbounded 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 is being used (but not if early_data support is also configured and the default anti-replay protection is in use). In this case, under certain conditions, the session cache can get into an incorrect state and it will fail to flush properly as it fills. The session cache will continue to grow in an unbounded manner. A malicious client could deliberately create the scenario for this failure to force 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 TLS clients. The FIPS modules in 3.2, 3.1 and 3.0 are not affected by this issue. OpenSSL 1.0.2 is also not affected by this issue.
 (CVE-2024-2511)

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/20240408.txt

http://www.nessus.org/u?de1ba75d

Plugin Details

Severity: Medium

ID: 193185

File Name: freebsd_pkg_7c217849f7d711eea49084a93843eb75.nasl

Version: 1.2

Type: local

Published: 4/11/2024

Updated: 5/31/2024

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Low

Score: 2.2

CVSS v2

Risk Factor: Medium

Base Score: 4.3

Temporal Score: 3.2

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

CVSS Score Source: CVE-2024-2511

CVSS v3

Risk Factor: Medium

Base Score: 5.9

Temporal Score: 5.2

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

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: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: 4/11/2024

Vulnerability Publication Date: 4/8/2024

Reference Information

CVE: CVE-2024-2511

IAVA: 2024-A-0208-S