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CVE-2015-4171

2.6 · LOW

strongSwan 4.3.0 through 5.x before 5.3.2 and strongSwan VPN Client before 1.4.6, when using EAP or pre-shared keys for authenticating an IKEv2 connection, does not enforce server authentication re…

Published Jun 10, 2015strongswanCWE-200EPSS 2.03%

Overview

CVE-2015-4171 is a low-severity vulnerability affecting strongswan strongswan_vpn_client. It was published on June 10, 2015 and has a CVSS 2.0 base score of 2.6 (LOW).

This vulnerability has a CVSS 2.0 base score of 2.6, rated LOW. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

strongSwan 4.3.0 through 5.x before 5.3.2 and strongSwan VPN Client before 1.4.6, when using EAP or pre-shared keys for authenticating an IKEv2 connection, does not enforce server authentication restrictions until the entire authentication process is complete, which allows remote servers to obtain credentials by using a valid certificate and then reading the responses.

Remediation

Check the references section for vendor advisories and patches from strongswan. Update strongswan_vpn_client to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected products

VendorProductVersionsStatus
strongswanstrongswan_vpn_client0Affected

References

Reflists.opensuse.org/opensuse-updates/2015-06/msg00040.htmlRefwww.debian.org/security/2015/dsa-3282Refwww.openwall.com/lists/oss-security/2015/05/29/6Refwww.openwall.com/lists/oss-security/2015/05/29/7Refwww.openwall.com/lists/oss-security/2015/06/08/4Refwww.securityfocus.com/bid/74933Refwww.securitytracker.com/id/1032514Refwww.ubuntu.com/usn/USN-2628-1Refbugzilla.suse.com/show_bug.cgi?id=933591Refplay.google.com/store/apps/details?id=org.strongswan.android

How CyberStrike helps

Frequently asked questions

What is CVE-2015-4171?

CVE-2015-4171 is a low-severity vulnerability affecting strongswan strongswan_vpn_client. It was published on June 10, 2015 and has a CVSS 2.0 base score of 2.6 (LOW).

How severe is CVE-2015-4171?

This vulnerability has a CVSS 2.0 base score of 2.6, rated LOW. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2015-4171?

Check the references section for vendor advisories and patches from strongswan. Update strongswan_vpn_client to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2015-4171?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2015-4171 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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