CVE-2016-8858

Impact:
Moderate
Public Date:
2016-10-17
Bugzilla:
1384860: CVE-2016-8858 openssh: Memory exhaustion due to unregistered KEXINIT handler after receiving message

The MITRE CVE dictionary describes this issue as:

** DISPUTED ** The kex_input_kexinit function in kex.c in OpenSSH 6.x and 7.x through 7.3 allows remote attackers to cause a denial of service (memory consumption) by sending many duplicate KEXINIT requests. NOTE: a third party reports that "OpenSSH upstream does not consider this as a security issue."

Find out more about CVE-2016-8858 from the MITRE CVE dictionary dictionary and NIST NVD.

Statement

The Red Hat Product Security Team does not consider this issue to be a security flaw, for more information please refer to https://bugzilla.redhat.com/show_bug.cgi?id=1384860#c5

CVSS v2 metrics

NOTE: The following CVSS v2 metrics and score provided are preliminary and subject to review.

Base Score 5
Base Metrics AV:N/AC:L/Au:N/C:N/I:N/A:P
Access Vector Network
Access Complexity Low
Authentication None
Confidentiality Impact None
Integrity Impact None
Availability Impact Partial

CVSS v3 metrics

NOTE: The following CVSS v3 metrics and score provided are preliminary and subject to review.

CVSS3 Base Score 5.8
CVSS3 Base Metrics CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Changed
Confidentiality None
Integrity Impact None
Availability Impact Low

Find out more about Red Hat support for the Common Vulnerability Scoring System (CVSS).

Affected Packages State

Platform Package State
Red Hat Enterprise Linux 7 openssh Not affected
Red Hat Enterprise Linux 6 openssh Not affected
Red Hat Enterprise Linux 5 openssh Not affected

Acknowledgements

Red Hat would like to thank Shi Lei (Qihoo 360) for reporting this issue.

Last Modified

CVE description copyright © 2017, The MITRE Corporation

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