7.5 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
5 Medium
CVSS2
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:N/I:N/A:P
0.236 Low
EPSS
Percentile
96.5%
Severity: High
Date : 2017-05-13
CVE-ID : CVE-2017-7478 CVE-2017-7479
Package : openvpn
Type : denial of service
Remote : Yes
Link : https://security.archlinux.org/AVG-271
The package openvpn before version 2.4.2-1 is vulnerable to denial of
service.
Upgrade to 2.4.2-1.
The problems have been fixed upstream in version 2.4.2.
The most severe vulnerability, CVE-2017-7478, which allows a remote
unauthenticated attacker to cause a denial of service, can be mitigated
by setting up tls-auth or tls-crypt. Note that this requires changing
both server and clients configurations.
A security issue has been found in OpenVPN <= 2.4.1 where an
unauthenticated attacker can send a packet with an unexpected payload
size during SSL handshake, causing a server shutdown. Servers using
tls-auth are protected against this attack as packets with an invalid
HMAC are discarded before being processed by the vulnerable code.
A security issue has been found in OpenVPN <= 2.4.1 where an
authenticated attacker can crash a server using an AEAD mode cipher by
sending crafted data to exhaust the packet counter.
A remote, unauthenticated attacker can crash a server not using tls-
auth or tls-crypt by sending a packet with an unexpected payload size.
A remote, authenticated attacker can crash a server using an AEAD mode
cipher by sending crafted data to exhaust the packet counter.
https://community.openvpn.net/openvpn/wiki/QuarkslabAndCryptographyEngineerAudits
https://ostif.org/the-openvpn-2-4-0-audit-by-ostif-and-quarkslab-results/
http://blog.quarkslab.com/security-assessment-of-openvpn.html
https://security.archlinux.org/CVE-2017-7478
https://security.archlinux.org/CVE-2017-7479
7.5 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
5 Medium
CVSS2
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:N/I:N/A:P
0.236 Low
EPSS
Percentile
96.5%