Bug 1369386 (CVE-2016-6329) - CVE-2016-6329 openvpn: Birthday attack against BF-CBC used by default (SWEET32)
Summary: CVE-2016-6329 openvpn: Birthday attack against BF-CBC used by default (SWEET32)
Keywords:
Status: CLOSED UPSTREAM
Alias: CVE-2016-6329
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1369833 1369834
Blocks:
TreeView+ depends on / blocked
 
Reported: 2016-08-23 09:24 UTC by Adam Mariš
Modified: 2021-02-17 03:25 UTC (History)
2 users (show)

Fixed In Version:
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Last Closed: 2019-06-08 02:57:46 UTC
Embargoed:

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Description Adam Mariš 2016-08-23 09:24:16 UTC 
Ciphers with 64-bit block sizes used in CBC mode were found to be vulnerable to birthday attack when key renegotiation doesn't happen frequently or at all in long running connections. Blowfish cipher as used in OpenVPN by default is vulnerable to this attack, that allows remote attacker to recover partial plaintext information (XOR of two plaintext blocks).

External References:

https://community.openvpn.net/openvpn/wiki/SWEET32
https://sweet32.info/
Comment 1 Adam Mariš 2016-08-23 09:24:20 UTC 
Acknowledgments:

Name: OpenVPN
Upstream: Karthikeyan Bhargavan (Inria), Gaëtan Leurent (Inria)
Comment 2 Adam Mariš 2016-08-24 14:06:31 UTC 
Created openvpn tracking bugs for this issue:

Affects: fedora-all [bug 1369833]
Affects: epel-all [bug 1369834]
Comment 3 Product Security DevOps Team 2019-06-08 02:57:46 UTC 
This CVE Bugzilla entry is for community support informational purposes only as it does not affect a package in a commercially supported Red Hat product. Refer to the dependent bugs for status of those individual community products.
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