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Bug 1369386 - (CVE-2016-6329) CVE-2016-6329 openvpn: Birthday attack against BF-CBC used by default (SWEET32)
CVE-2016-6329 openvpn: Birthday attack against BF-CBC used by default (SWEET32)
Status: NEW
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
medium Severity medium
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Assigned To: Red Hat Product Security
impact=moderate,public=20160824,repor...
: Security
Depends On: 1369833 1369834
Blocks:
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Reported: 2016-08-23 05:24 EDT by Adam Mariš
Modified: 2016-08-25 05:18 EDT (History)
2 users (show)

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Description Adam Mariš 2016-08-23 05:24:16 EDT 
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 05:24:20 EDT 
Acknowledgments:

Name: OpenVPN
Upstream: Karthikeyan Bhargavan (Inria), Gaëtan Leurent (Inria)
Comment 2 Adam Mariš 2016-08-24 10:06:31 EDT 
Created openvpn tracking bugs for this issue:

Affects: fedora-all [bug 1369833]
Affects: epel-all [bug 1369834]
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