Information disclosure in strongswan (Alpine package)

1) Information disclosure

EUVDB-ID: #VU32414

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 - Exposure of sensitive information to an unauthorized actor

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 (Alpine package): 5.3.1-r0 - 5.3.1-r2

CPE2.3

• cpe:2.3:a:alpine:strongswan_alpine_package:5.3.1-r0:*:*:*:*:alpine_linux:*:3.1
• cpe:2.3:a:alpine:strongswan_alpine_package:5.3.1-r2:*:*:*:*:alpine_linux:*:3.2

External links

https://git.alpinelinux.org/aports/commit/?id=7deea87de6e4bce6e36e247fe514a028cced7fd3

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.