Debian DSA-2665-1 : strongswan - authentication bypass

medium Nessus Plugin ID 66281

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Synopsis

The remote Debian host is missing a security-related update.

Description

Kevin Wojtysiak discovered a vulnerability in strongSwan, an IPsec based VPN solution.

When using the OpenSSL plugin for ECDSA based authentication, an empty, zeroed or otherwise invalid signature is handled as a legitimate one. An attacker could use a forged signature to authenticate like a legitimate user and gain access to the VPN (and everything protected by this).

While the issue looks like CVE-2012-2388 (RSA signature based authentication bypass), it is unrelated.

Solution

Upgrade the strongswan packages.

For the stable distribution (squeeze), this problem has been fixed in version 4.4.1-5.3.

Plugin Details

Severity: Medium

ID: 66281

File Name: debian_DSA-2665.nasl

Version: 1.11

Type: local

Agent: unix

Family: Debian Local Security Checks

Published: 5/1/2013

Updated: 1/11/2021

Supported Sensors: Agentless Assessment, Frictionless Assessment Agent, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Low

Score: 3.7

CVSS v2

Risk Factor: Medium

Base Score: 4.9

Temporal Score: 3.6

Vector: CVSS2#AV:N/AC:M/Au:S/C:P/I:P/A:N

Vulnerability Information

CPE: p-cpe:/a:debian:debian_linux:strongswan, cpe:/o:debian:debian_linux:6.0

Required KB Items: Host/local_checks_enabled, Host/Debian/release, Host/Debian/dpkg-l

Exploit Ease: No known exploits are available

Patch Publication Date: 4/30/2013

Reference Information

CVE: CVE-2013-2944

BID: 59580

DSA: 2665

Detections

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