CVE-2017-3730

Public Exploit
Bad (EC)DHE parameters cause a client crash

Description

In OpenSSL 1.1.0 before 1.1.0d, 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.

Category

7.5
CVSS
Severity: High
CVSS 3.0 •
CVSS 2.0 •
EPSS 58.57% Top 5%
Vendor Advisory gentoo.org Vendor Advisory openssl.org
Affected: OpenSSL OpenSSL
Published at:
Updated at:

References

Link Tags
http://www.oracle.com/technetwork/security-advisory/cpujan2018-3236628.html patch
https://www.exploit-db.com/exploits/41192/ exploit vdb entry third party advisory
http://www.securityfocus.com/bid/95812 vdb entry third party advisory broken link
https://github.com/openssl/openssl/commit/efbe126e3ebb9123ac9d058aa2bb044261342aaa third party advisory patch
https://www.openssl.org/news/secadv/20170126.txt patch vendor advisory
http://www.securitytracker.com/id/1037717 vdb entry third party advisory
http://www.oracle.com/technetwork/security-advisory/cpuoct2017-3236626.html patch
https://security.gentoo.org/glsa/201702-07 third party advisory vendor advisory
https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03838en_us third party advisory
https://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.html patch

Frequently Asked Questions

What is the severity of CVE-2017-3730?
CVE-2017-3730 has been scored as a high severity vulnerability.
How to fix CVE-2017-3730?
To fix CVE-2017-3730, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2017-3730 being actively exploited in the wild?
It is possible that CVE-2017-3730 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~59% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2017-3730?
CVE-2017-3730 affects OpenSSL OpenSSL.
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