CVE-2016-6329: Infoleak
First published: Tue Jan 31 2017(Updated: )
OpenVPN, when using a 64-bit block cipher, makes it easier for remote attackers to obtain cleartext data via a birthday attack against a long-duration encrypted session, as demonstrated by an HTTP-over-OpenVPN session using Blowfish in CBC mode, aka a "Sweet32" attack.
Credit: secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| OpenVPN Monitor | <=2.3.14 |
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Reference Links
- http://www-01.ibm.com/support/docview.wss?uid=nas8N1021697
- http://www-01.ibm.com/support/docview.wss?uid=swg21991482
- http://www-01.ibm.com/support/docview.wss?uid=swg21995039
- http://www.securityfocus.com/bid/92631
- http://www.securitytracker.com/id/1036695
- https://cert-portal.siemens.com/productcert/pdf/ssa-556833.pdf
- https://community.openvpn.net/openvpn/wiki/SWEET32
- https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05369403
- https://security.gentoo.org/glsa/201611-02
- https://sweet32.info/
Frequently Asked Questions
What is the severity of CVE-2016-6329?
CVE-2016-6329 is considered a medium severity vulnerability due to its potential to expose cleartext data through a birthday attack.
How do I fix CVE-2016-6329?
To fix CVE-2016-6329, upgrade OpenVPN to a version later than 2.3.14 and avoid using 64-bit block ciphers like Blowfish in CBC mode.
What type of attack does CVE-2016-6329 allow?
CVE-2016-6329 allows remote attackers to perform a birthday attack against long-duration encrypted sessions.
In which encryption mode is CVE-2016-6329 particularly vulnerable?
CVE-2016-6329 is particularly vulnerable when using Blowfish in CBC mode.
Which versions of OpenVPN are affected by CVE-2016-6329?
CVE-2016-6329 affects OpenVPN versions up to and including 2.3.14.
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