What is CVE-2018-15919?

CVE-2018-15919 is a vulnerability in OpenSSH that allows remote attackers to detect the existence of users on a target system.

How can this vulnerability be exploited?

This vulnerability can be exploited by remote attackers to remotely observe the behavior of the auth-gss2.c file in OpenSSH.

Which software is affected by CVE-2018-15919?

OpenSSH versions 5.9 to 7.8 are affected by this vulnerability, as well as certain versions of Netapp Cloud Backup, Netapp Data ONTAP Edge, Netapp ONTAP Select Deploy, and Netapp Steelstore.

What is the severity of CVE-2018-15919?

The severity of CVE-2018-15919 is medium with a CVSS score of 5.3.

How can I mitigate this vulnerability?

To mitigate this vulnerability, update OpenSSH to a version that is not affected, or apply the necessary patches provided by the software vendor.

Vulnerability/
CVE-2018-15919

medium

5.3

CWE

200

28/8/2018

7/3/2019

CVE-2018-15919: Infoleak

First published: Tue Aug 28 2018(Updated: )

Remotely observable behaviour in auth-gss2.c in OpenSSH through 7.8 could be used by remote attackers to detect existence of users on a target system when GSS2 is in use. NOTE: the discoverer states 'We understand that the OpenSSH developers do not want to treat such a username enumeration (or "oracle") as a vulnerability.'

Credit: cve@mitre.org

Affected Software	Affected Version	How to fix
Openbsd Openssh	>=5.9<=7.8
Netapp Cloud Backup
Netapp Data Ontap Edge
Netapp Ontap Select Deploy
Netapp Steelstore
Netapp Cn1610 Firmware
Netapp Cn1610

Remedy

http://seclists.org/oss-sec/2018/q3/180

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Reference Links

Frequently Asked Questions

What is CVE-2018-15919?
CVE-2018-15919 is a vulnerability in OpenSSH that allows remote attackers to detect the existence of users on a target system.
How can this vulnerability be exploited?
This vulnerability can be exploited by remote attackers to remotely observe the behavior of the auth-gss2.c file in OpenSSH.
Which software is affected by CVE-2018-15919?
OpenSSH versions 5.9 to 7.8 are affected by this vulnerability, as well as certain versions of Netapp Cloud Backup, Netapp Data ONTAP Edge, Netapp ONTAP Select Deploy, and Netapp Steelstore.
What is the severity of CVE-2018-15919?
The severity of CVE-2018-15919 is medium with a CVSS score of 5.3.
How can I mitigate this vulnerability?
To mitigate this vulnerability, update OpenSSH to a version that is not affected, or apply the necessary patches provided by the software vendor.

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version/openbsd openssh/5.9
version/openbsd openssh/7.8
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canonical/netapp ontap select deploy
canonical/netapp steelstore
canonical/netapp cn1610 firmware
canonical/netapp cn1610

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