Information disclosure in strongSwan

1) Information disclosure

EUVDB-ID: #VU32414

Risk: Low

CVSSv3.1: 3.2 [CVSS:3.1/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-2015-4171

CWE-ID: CWE-200 - Information exposure

Exploit availability: No

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

External links

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

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.