CVE-2023-38711

libreswan: Invalid IKEv1 Quick Mode ID causes restart

Severity Score

6.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

Track

*SSVC

Descriptions

An issue was discovered in Libreswan before 4.12. When an IKEv1 Quick Mode connection configured with ID_IPV4_ADDR or ID_IPV6_ADDR receives an IDcr payload with ID_FQDN, a NULL pointer dereference causes a crash and restart of the pluto daemon. NOTE: the earliest affected version is 4.6.

Se ha descubierto un problema en Libreswan anterior a 4.12. Cuando una conexión de modo rápido IKEv1 configurada con ID_IPV4_ADDR o ID_IPV6_ADDR recibe una carga útil IDcr con ID_FQDN, una desviación de puntero NULL provoca un bloqueo y reinicio del demonio pluto. NOTA: la primera versión afectada es la 4.6.

A NULL pointer dereference flaw was found in Libreswan when processing IKEv1 Quick Mode requests. When an IKEv1 Quick Mode connection configured with ID_IPV4_ADDR or ID_IPV6_ADDR receives an IDcr payload with ID_FQDN, it triggers a NULL pointer dereference error. This flaw allows a malicious client or attacker to send a malformed IKEv1 Quick Mode packet, causing a crash and restart of the libreswan pluto daemon. When sent continuously, this issue leads to a denial of service attack.

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Network

Attack Complexity

Low

Authentication

Single

Confidentiality

None

Integrity

None

Availability

Complete

* Common Vulnerability Scoring System

SSVC

Decision:Track

Exploitation

None

Automatable

Tech. Impact

Partial

* Organization's Worst-case Scenario

Timeline

2023-07-24 CVE Reserved
2023-08-25 CVE Published
2024-08-02 CVE Updated
2025-04-15 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-476: NULL Pointer Dereference

CAPEC

References (4)

URL	Tag	Source
https://github.com/libreswan/libreswan/tags	Third Party Advisory
https://libreswan.org/security/CVE-2023-38711	Third Party Advisory

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
https://access.redhat.com/security/cve/CVE-2023-38711	2025-01-14
https://bugzilla.redhat.com/show_bug.cgi?id=2215952	2025-01-14

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Libreswan Search vendor "Libreswan"		Libreswan Search vendor "Libreswan" for product "Libreswan"				>= 4.6 < 4.12 Search vendor "Libreswan" for product "Libreswan" and version " >= 4.6 < 4.12"		-		Affected