Vulnerability identifier: #VU27711

Vulnerability risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-12312

CWE-ID: CWE-476

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
libreswan
Universal components / Libraries / Libraries used by multiple products

Vendor: libreswan.org

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a NULL pointer dereference issue within the send_v2N_spi_response_from_state() function in programs/pluto/ikev2_send.c. A remote attacker can cause an assertion failure by initiating an IKEv2 IKE_SA_INIT exchange, followed by a bogus INFORMATIONAL exchange instead of the expected IKE_AUTH exchange and cause the pluto IKE daemon to restart.

Mitigation
Install update from vendor's website.

Vulnerable software versions

libreswan: 3.27

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External links
http://www.iwantacve.cn/index.php/archives/218/
http://github.com/libreswan/libreswan/compare/9b1394e...3897683
http://github.com/libreswan/libreswan/issues/246
http://libreswan.org/security/CVE-2019-12312/CVE-2019-12312.txt
http://libreswan.org/security/CVE-2019-12312/libreswan-3.27-CVE-2019-12312.patch

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.