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AUSCERT External Security Bulletin Redistribution
ESB-2017.1584
OpenVPN vulnerabilities
23 June 2017
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AusCERT Security Bulletin Summary
---------------------------------
Product: openvpn
Publisher: Ubuntu
Operating System: Ubuntu
Impact/Access: Access Privileged Data -- Remote/Unauthenticated
Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2017-7521 CVE-2017-7520 CVE-2017-7512
CVE-2017-7508 CVE-2017-7479 CVE-2016-6329
Reference: ASB-2016.0098
ESB-2017.1561
ESB-2016.2898
ESB-2016.2379
Original Bulletin:
http://www.ubuntu.com/usn/usn-3339-1
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Ubuntu Security Notice USN-3339-1
June 22, 2017
openvpn vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- - Ubuntu 17.04
- - Ubuntu 16.10
- - Ubuntu 16.04 LTS
- - Ubuntu 14.04 LTS
Summary:
Several security issues were fixed in OpenVPN.
Software Description:
- - openvpn: virtual private network software
Details:
Karthikeyan Bhargavan and Gaëtan Leurent discovered that 64-bit block
ciphers are vulnerable to a birthday attack. A remote attacker could
possibly use this issue to recover cleartext data. Fixing this issue
requires a configuration change to switch to a different cipher. This
update adds a warning to the log file when a 64-bit block cipher is in use.
This issue only affected Ubuntu 14.04 LTS, Ubuntu 16.04 LTS and
Ubuntu 16.10. (CVE-2016-6329)
It was discovered that OpenVPN incorrectly handled rollover of packet ids.
An authenticated remote attacker could use this issue to cause OpenVPN to
crash, resulting in a denial of service. This issue only affected Ubuntu
14.04 LTS, Ubuntu 16.04 LTS and Ubuntu 16.10. (CVE-2017-7479)
Guido Vranken discovered that OpenVPN incorrectly handled certain malformed
IPv6 packets. A remote attacker could use this issue to cause OpenVPN to
crash, resulting in a denial of service. (CVE-2017-7508)
Guido Vranken discovered that OpenVPN incorrectly handled memory. A remote
attacker could use this issue to cause OpenVPN to crash, resulting in a
denial of service. (CVE-2017-7512)
Guido Vranken discovered that OpenVPN incorrectly handled an HTTP proxy
with NTLM authentication. A remote attacker could use this issue to cause
OpenVPN clients to crash, resulting in a denial of service, or possibly
expose sensitive memory contents. (CVE-2017-7520)
Guido Vranken discovered that OpenVPN incorrectly handled certain x509
extensions. A remote attacker could use this issue to cause OpenVPN to
crash, resulting in a denial of service. (CVE-2017-7521)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 17.04:
openvpn 2.4.0-4ubuntu1.3
Ubuntu 16.10:
openvpn 2.3.11-1ubuntu2.1
Ubuntu 16.04 LTS:
openvpn 2.3.10-1ubuntu2.1
Ubuntu 14.04 LTS:
openvpn 2.3.2-7ubuntu3.2
In general, a standard system update will make all the necessary changes.
References:
https://www.ubuntu.com/usn/usn-3339-1
CVE-2016-6329, CVE-2017-7479, CVE-2017-7508, CVE-2017-7512,
CVE-2017-7520, CVE-2017-7521
Package Information:
https://launchpad.net/ubuntu/+source/openvpn/2.4.0-4ubuntu1.3
https://launchpad.net/ubuntu/+source/openvpn/2.3.11-1ubuntu2.1
https://launchpad.net/ubuntu/+source/openvpn/2.3.10-1ubuntu2.1
https://launchpad.net/ubuntu/+source/openvpn/2.3.2-7ubuntu3.2
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