OpenSSH up to 7.7 auth2-gss.c Request information disclosure

CVSS Meta Temp Score
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CTI Interest Score
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5.2$0-$5k0.00

Summaryinfo

A vulnerability was found in OpenSSH up to 7.7. It has been rated as problematic. This impacts an unknown function of the file auth2-gss.c. The manipulation as part of Request leads to information disclosure. This vulnerability is documented as CVE-2018-15473. The attack can be initiated remotely. Additionally, an exploit exists. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in OpenSSH up to 7.7 (Connectivity Software). It has been rated as problematic. This issue affects an unknown function of the file auth2-gss.c. The manipulation as part of a Request leads to a information disclosure vulnerability. Using CWE to declare the problem leads to CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. Impacted is confidentiality. The summary by CVE is:

OpenSSH through 7.7 is prone to a user enumeration vulnerability due to not delaying bailout for an invalid authenticating user until after the packet containing the request has been fully parsed, related to auth2-gss.c, auth2-hostbased.c, and auth2-pubkey.c.

The bug was discovered 07/31/2018. The weakness was released 08/17/2018 (Website). It is possible to read the advisory at openwall.com. The identification of this vulnerability is CVE-2018-15473 since 08/17/2018. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details as well as a public exploit are known. The attack technique deployed by this issue is T1592 according to MITRE ATT&CK.

The exploit is available at exploit-db.com. It is declared as highly functional. The vulnerability was handled as a non-public zero-day exploit for at least 17 days. During that time the estimated underground price was around $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 112066 (Debian DSA-4280-1 : openssh - security update), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Debian Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 197294 (Ubuntu Security Notification for Openssh Vulnerabilities (USN-3809-1)).

Upgrading eliminates this vulnerability. A possible mitigation has been published 6 days after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Exploit-DB (45210), Tenable (112066) and SecurityFocus (BID 105140†). Entry connected to this vulnerability is available at VDB-112267. Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 5.2

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.3
NVD Vector: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Information disclosure
CWE: CWE-200 / CWE-284 / CWE-266
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Access: Public
Status: Highly functional
Download: 🔍

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 112066
Nessus Name: Debian DSA-4280-1 : openssh - security update
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

MetaSploit ID: ssh_enumusers.rb
MetaSploit Name: SSH Username Enumeration
MetaSploit File: 🔍

Exploit-DB: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Patch: github.com

Timelineinfo

07/31/2018 🔍
08/16/2018 +16 days 🔍
08/17/2018 +0 days 🔍
08/17/2018 +0 days 🔍
08/17/2018 +0 days 🔍
08/18/2018 +1 days 🔍
08/22/2018 +4 days 🔍
08/23/2018 +1 days 🔍
12/18/2025 +2673 days 🔍

Sourcesinfo

Advisory: RHSA-2019:0711
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2018-15473 (🔍)
GCVE (CVE): GCVE-0-2018-15473
GCVE (VulDB): GCVE-100-123011

OVAL: 🔍

SecurityFocus: 105140 - OpenSSH CVE-2018-15473 User Enumeration Vulnerability
SecurityTracker: 1041487

scip Labs: https://www.scip.ch/en/?labs.20161013
See also: 🔍

Entryinfo

Created: 08/18/2018 10:57
Updated: 12/18/2025 00:05
Changes: 08/18/2018 10:57 (80), 03/16/2020 15:10 (9), 05/02/2023 14:12 (6), 09/01/2024 19:55 (14), 12/18/2025 00:05 (1)
Complete: 🔍
Cache ID: 216:D06:103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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