Debian DSA-3900-1 : openvpn - security update

high Nessus Plugin ID 101067

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Synopsis

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

Description

Several issues were discovered in openvpn, a virtual private network application.

- CVE-2017-7479 It was discovered that openvpn did not properly handle the rollover of packet identifiers. This would allow an authenticated remote attacker to cause a denial-of-service via application crash.

- CVE-2017-7508 Guido Vranken discovered that openvpn did not properly handle specific malformed IPv6 packets. This would allow a remote attacker to cause a denial-of-service via application crash.

- CVE-2017-7520 Guido Vranken discovered that openvpn did not properly handle clients connecting to an HTTP proxy with NTLMv2 authentication. This would allow a remote attacker to cause a denial-of-service via application crash, or potentially leak sensitive information like the user's proxy password.

- CVE-2017-7521 Guido Vranken discovered that openvpn did not properly handle some x509 extensions. This would allow a remote attacker to cause a denial-of-service via application crash.

Solution

Upgrade the openvpn packages.

For the oldstable distribution (jessie), these problems have been fixed in version 2.3.4-5+deb8u2.

For the stable distribution (stretch), these problems have been fixed in version 2.4.0-6+deb9u1.

Plugin Details

Severity: High

ID: 101067

File Name: debian_DSA-3900.nasl

Version: 3.12

Type: local

Agent: unix

Family: Debian Local Security Checks

Published: 6/28/2017

Updated: 1/4/2021

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

Risk Information

VPR

Risk Factor: Medium

Score: 5.2

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.7

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

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:debian:debian_linux:9.0, cpe:/o:debian:debian_linux:8.0, p-cpe:/a:debian:debian_linux:openvpn

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

Exploit Ease: No known exploits are available

Patch Publication Date: 6/27/2017

Reference Information

CVE: CVE-2017-7479, CVE-2017-7508, CVE-2017-7520, CVE-2017-7521

DSA: 3900

Detections

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