Bug 1450997 - (CVE-2017-7479) CVE-2017-7479 openvpn: DoS due to exhaustion of packet-ID counter
CVE-2017-7479 openvpn: DoS due to exhaustion of packet-ID counter
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=20170511,repor...
: Security
Depends On: 1451000 1451001
Blocks:
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Reported: 2017-05-15 10:27 EDT by Adam Mariš
Modified: 2017-05-15 10:32 EDT (History)
4 users (show)

See Also:
Fixed In Version: openvpn 2.3.15, openvpn 2.4.2
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Description Adam Mariš 2017-05-15 10:27:22 EDT
An authenticated client can cause the server's the packet-id counter to roll over, which would lead the server process to hit an ASSERT() and stop running.

Upstream fixes:

openvpn 2.3: https://github.com/OpenVPN/openvpn/commit/b727643cdf
openvpn 2.4: https://github.com/OpenVPN/openvpn/commit/591a4e574c
master: https://github.com/OpenVPN/openvpn/commit/e498cb0ea8

External References:

https://community.openvpn.net/openvpn/wiki/QuarkslabAndCryptographyEngineerAudits
Comment 1 Adam Mariš 2017-05-15 10:27:38 EDT
Acknowledgments:

Name: the OpenVPN project
Upstream: QuarksLab
Comment 3 Adam Mariš 2017-05-15 10:32:16 EDT
Created openvpn tracking bugs for this issue:

Affects: epel-all [bug 1451001]
Affects: fedora-all [bug 1451000]

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