#VU32414 Information disclosure in strongSwan - CVE-2015-4171

Vulnerability identifier: #VU32414

Vulnerability risk: Low

CVSSv4.0: 1.7 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2015-4171

CWE-ID: CWE-200

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
strongSwan
Server applications / Encryption software

Vendor: strongswan.org

Description

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

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.

Mitigation
Install update from vendor's website.

Vulnerable software versions

strongSwan: 5.3.0 - 5.3.1

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External links
https://lists.opensuse.org/opensuse-updates/2015-06/msg00040.html
https://www.debian.org/security/2015/dsa-3282
https://www.openwall.com/lists/oss-security/2015/05/29/6
https://www.openwall.com/lists/oss-security/2015/05/29/7
https://www.openwall.com/lists/oss-security/2015/06/08/4
https://www.securityfocus.com/bid/74933
https://www.securitytracker.com/id/1032514
https://www.ubuntu.com/usn/USN-2628-1
https://bugzilla.suse.com/show_bug.cgi?id=933591
https://play.google.com/store/apps/details?id=org.strongswan.android
https://www.strongswan.org/blog/2015/06/08/strongswan-vulnerability-%2528cve-2015-4171%2529.html
https://www.suse.com/security/cve/CVE-2015-4171.html

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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.