Vulnerability identifier: #VU27710

Vulnerability risk: Low

CVSSv3.1: 3.2 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-10155

CWE-ID: CWE-345

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
libreswan
Universal components / Libraries / Libraries used by multiple products
strongSwan
Server applications / Encryption software
Openswan
Server applications / Remote access servers, VPN

Vendor: libreswan.org
strongswan.org
openswan.org

Description

The vulnerability allows a remote attacker to gain access to sensitive information.

The vulnerability exists due to the application does not verify origin for IKEv1 informational exchange packets. A remote attacker can craft packets and make the application believe they were sent by the original user.

Successful exploitation of the vulnerability may allow an attacker to gain access to sensitive information and use this issue combined with other vulnerabilities to decrypt data.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

libreswan: 0.9.9 - 3.28

strongSwan: 2.0.0 - 4.6.4

Openswan: 2.1.1 - 2.6.51.3

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External links
http://access.redhat.com/errata/RHSA-2019:3391
http://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-10155
http://libreswan.org/security/CVE-2019-10155/
http://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/EUEXFCN7FAYBKJBQJLYCEUQUCHDEJRZW/
http://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/LFGPGLLKAXSLWFI62A6BZHTZSCHRCBXS/

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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.