CVE-2016-6329

NameCVE-2016-6329
DescriptionOpenVPN, 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.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
NVD severitymedium (attack range: remote)

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
openvpn (PTS)jessie (security), jessie2.3.4-5+deb8u2vulnerable
stretch2.4.0-6+deb9u2vulnerable
stretch (security)2.4.0-6+deb9u1vulnerable
buster, sid2.4.5-1vulnerable

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
openvpnsource(unstable)(unfixed)unimportant

Notes

https://community.openvpn.net/openvpn/wiki/SWEET32
This is a generic cryptographic weakness, not a vulnerability in OpenVPN per se

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