In Libreswan 3.27 an assertion failure can lead to a pluto IKE daemon restart. An attacker can trigger a NULL pointer dereference by initiating an IKEv2 IKE_SA_INIT exchange, followed by a bogus INFORMATIONAL exchange instead of the normallly expected IKE_AUTH exchange. This affects send_v2N_spi_response_from_state() in programs/pluto/ikev2_send.c that will then trigger a NULL pointer dereference leading to a restart of libreswan.

The remote CentOS Linux 8 host has a package installed that is affected by multiple vulnerabilities as referenced in the CESA-2019:3391 advisory.

  - libreswan: vulnerability in the processing of IKEv1 informational packets due to missing integrity check     (CVE-2019-10155)

  - libreswan: null-pointer dereference by sending two IKEv2 packets (CVE-2019-12312)

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

According to the version of the libreswan package installed, the EulerOS installation on the remote host is affected by the following vulnerability :

  - Before 3.28 Libreswan, assertion failure may lead to     Pluto IKE daemon restart.An attacker can through 3     des_cbc mode to send two IKEv2 data to the Libreswan     server (init_IKE and delete_IKE) to trigger a NULL     pointer dereference.Using network security services     (NSS) build time, this will affect the     program/Pluto/ikev2_send     send_v2N_spi_response_from_state in (CVE-2019-12312)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The remote Redhat Enterprise Linux 8 host has a package installed that is affected by multiple vulnerabilities as referenced in the RHSA-2019:3391 advisory.

    Libreswan is an implementation of IPsec and IKE for Linux. IPsec is the Internet Protocol Security and     uses strong cryptography to provide both authentication and encryption services. These services allow you     to build secure tunnels through untrusted networks such as virtual private network (VPN).

    The following packages have been upgraded to a later upstream version: libreswan (3.29). (BZ#1738853)

    Security Fix(es):

    * libreswan: vulnerability in the processing of IKEv1 informational packets due to missing integrity check     (CVE-2019-10155)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

    Additional Changes:

    For detailed information on changes in this release, see the Red Hat Enterprise Linux 8.1 Release Notes     linked from the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

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

ID	Name	Product	Family	Severity
145635	CentOS 8 : libreswan (CESA-2019:3391)	Nessus	CentOS Local Security Checks	high
139968	EulerOS 2.0 SP8 : libreswan (EulerOS-SA-2020-1865)	Nessus	Huawei Local Security Checks	high
130534	RHEL 8 : libreswan (RHSA-2019:3391)	Nessus	Red Hat Local Security Checks	high

Detections

Analytics

CVE-2019-12312

high

Tenable Plugins

high

high

high