Home/CVE/Remotely observable behaviour in auth-gss2.c in OpenSSH through 7.8 could be used by remote attackers to detect existenc
CVE

CVE-2018-15919

Remotely observable behaviour in auth-gss2.c in OpenSSH through 7.8 could be used by remote attackers to detect existenc

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.'.

MEDIUM · CVSS 5.3 EPSS 0.02082
Schedule remediation
  • SSVC automatable: yes - attacks can be scripted at scale
Sigma rules2 YARA rules0
⬡

Weakness Classification

CWE-200Exposure of Sensitive Information to an Unauthorized Actor
CWE-200Exposure of Sensitive Information to an Unauthorized Actor
▤

Affected Products & Versions

6
openbsd openssh>= 5.9 and <= 7.8
netapp cloud backupall versions
netapp data ontap edgeall versions
netapp ontap select deployall versions
netapp steelstoreall versions
netapp cn1610 firmwareall versions
◈

Sigma Hunt Rules

2
Exact rules name this CVE ID. Product rules name an affected product in their title. Related rules cover techniques used by actors who exploited this CVE. Showing the most relevant matches; the complete related set is on the full drill-down.
productmediumSuspicious OpenSSH Daemon Error
productmediumOpenSSH Server Listening On Socket
▣

Scoring & Timeline

5.3
MEDIUM · CVSS v3.1 · cve@mitre.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD28 Aug 2018 · 08:29 AM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
SSVC triage · cisa-vulnrichment
Exploitation
poc
Automatable
yes
Technical impact
partial
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
⚑

Vendor Advisories

6
suse-csafSUSE-SU-2018:3776-2
suse-csafSUSE-SU-2018:3776-1
suse-csafSUSE-SU-2018:3781-1
suse-csafSUSE-SU-2018:3768-1
suse-csafSUSE-SU-2018:3686-1
🔗

References & Sources

3
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
http://seclists.org/oss-sec/2018/q3/180Mailing ListPatchThird Party Advisory
http://www.securityfocus.com/bid/105163Third Party AdvisoryVDB Entry
https://security.netapp.com/advisory/ntap-20181221-0001/Third Party Advisory
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