Improper input validation in strongswan (Alpine package)

Published: 2017-05-31

Risk	Medium
Patch available	YES
Number of vulnerabilities	1
CVE-ID	CVE-2017-9023
CWE-ID	CWE-20
Exploitation vector	Network
Public exploit	N/A
Vulnerable software	strongswan (Alpine package) Operating systems & Components / Operating system package or component
Vendor	Alpine Linux Development Team

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Improper input validation

EUVDB-ID: #VU6874

Risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2017-9023

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

ASN.1 CHOICE types are not correctly handled by the ASN.1 parser in strongSwan when parsing X.509 certificates with extensions that use such types. This could lead to infinite looping of the thread parsing a specifically crafted certificate.

Mitigation

Install update from vendor's website.

Vulnerable software versions

strongswan (Alpine package): 5.3.5-r1

CPE2.3

cpe:2.3:a:alpine:strongswan_alpine_package:5.3.5-r1:*:*:*:*:alpine_linux:*:3.2

External links

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.