Bug 1416855 (CVE-2017-3730) - CVE-2017-3730 openssl: Bad (EC)DHE parameters cause a client crash
Summary: CVE-2017-3730 openssl: Bad (EC)DHE parameters cause a client crash
Keywords:
Status: CLOSED NOTABUG
Alias: CVE-2017-3730
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:
Blocks: 1416858
TreeView+ depends on / blocked
 
Reported: 2017-01-26 15:39 UTC by Andrej Nemec
Modified: 2021-02-17 02:41 UTC (History)
46 users (show)

Fixed In Version: openssl 1.1.0d
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Clone Of:
Environment:
Last Closed: 2017-01-31 11:58:43 UTC
Embargoed:

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Description Andrej Nemec 2017-01-26 15:39:44 UTC 
If a malicious server supplies bad parameters for a DHE or ECDHE key exchange
then this can result in the client attempting to dereference a NULL pointer
leading to a client crash. This could be exploited in a Denial of Service
attack.

This issue does not affect OpenSSL version 1.0.2.

External References:

https://www.openssl.org/news/secadv/20170126.txt
Comment 1 Tomas Hoger 2017-01-26 16:08:37 UTC 
Upstream commit:

https://git.openssl.org/?p=openssl.git;a=commitdiff;h=efbe126e3ebb9123ac9d058aa2bb044261342aaa

Write up from the original reporter:

https://guidovranken.wordpress.com/2017/01/26/cve-2017-3730-openssl-1-1-0-remote-client-denial-of-service-affects-servers-as-well-poc/
Comment 2 Tomas Hoger 2017-01-31 11:58:43 UTC 
This only affected OpenSSL 1.1.0, which is not currently included in any Red Hat product.
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