What’s Vulnerable › Vulnerabilities

CVE-2018-5388

• Severity: medium (CVSS 6.5 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 3.9% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2018-05-31 · updated 2026-06-17
• Weakness: CWE-124

Description

In stroke_socket.c in strongSwan before 5.6.3, a missing packet length check could allow a buffer underflow, which may lead to resource exhaustion and denial of service while reading from the socket.

Affected products

• Canonical Ubuntu Linux: 14.04, 16.04, 18.04
• Debian Linux: 8.0, 9.0
• strongSwan: before 5.6.3 — fixed in 5.6.3

How to fix

Upgrade to a fixed version: strongSwan 5.6.3. Check the vendor advisory for mitigations.

References

• http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00077.html
• http://lists.opensuse.org/opensuse-security-announce/2019-12/msg00001.html
• http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00047.html
• http://packetstormsecurity.com/files/172833/strongSwan-VPN-Charon-Server-Buffer-Overflow.html
• http://www.kb.cert.org/vuls/id/338343
• http://www.securityfocus.com/bid/104263
• https://git.strongswan.org/?p=strongswan.git%3Ba=commitdiff%3Bh=0acd1ab4
• https://security.gentoo.org/glsa/201811-16
• https://usn.ubuntu.com/3771-1/
• https://www.debian.org/security/2018/dsa-4229
• http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00077.html
• http://lists.opensuse.org/opensuse-security-announce/2019-12/msg00001.html

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