SSH 3.0/3.0.1/3.1/3.1.1 AllowedAuthentications improper authentication

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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7.0$0-$5k0.00

Summaryinfo

A vulnerability classified as critical has been found in SSH 3.0/3.0.1/3.1/3.1.1. This affects an unknown function of the component AllowedAuthentications. This manipulation causes improper authentication. This vulnerability is handled as CVE-2002-1646. There is not any exploit available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability has been found in SSH 3.0/3.0.1/3.1/3.1.1 (SSH Server Software) and classified as critical. Affected by this vulnerability is some unknown processing of the component AllowedAuthentications. The manipulation with an unknown input leads to a improper authentication vulnerability. The CWE definition for the vulnerability is CWE-287. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

SSH Secure Shell for Servers 3.0.0 to 3.1.1 allows remote attackers to override the AllowedAuthentications configuration and use less secure authentication schemes (e.g. password) than configured for the server.

The weakness was released 12/31/2002 by SSH Communications Security as confirmed advisory (CERT.org). It is possible to read the advisory at kb.cert.org. This vulnerability is known as CVE-2002-1646 since 03/28/2005. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. The technical details are unknown and an exploit is not publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 10965 (SSH 3 AllowedAuthentications Remote Bypass), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Misc. and running in the context r. The commercial vulnerability scanner Qualys is able to test this issue with plugin 38101 (SSH Communications Secure Shell Server AllowedAuthentications Configuration Overriding Vulnerability).

Upgrading eliminates this vulnerability.

The vulnerability is also documented in the databases at X-Force (9163), Tenable (10965), SecurityFocus (BID 4810†) and Vulnerability Center (SBV-1338†). 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: 7.3
VulDB Meta Temp Score: 7.0

VulDB Base Score: 7.3
VulDB Temp Score: 7.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

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

NVD Base Score: 🔍

Exploitinginfo

Class: Improper authentication
CWE: CWE-287
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 10965
Nessus Name: SSH 3 AllowedAuthentications Remote Bypass
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Timelineinfo

01/01/2002 🔍
05/23/2002 +142 days 🔍
05/24/2002 +1 days 🔍
12/31/2002 +221 days 🔍
12/31/2002 +0 days 🔍
06/27/2003 +178 days 🔍
03/28/2005 +640 days 🔍
08/04/2014 +3416 days 🔍
09/03/2025 +4048 days 🔍

Sourcesinfo

Advisory: kb.cert.org
Researcher: SSH Communications Security
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2002-1646 (🔍)
GCVE (CVE): GCVE-0-2002-1646
GCVE (VulDB): GCVE-100-19291
CERT: 🔍
X-Force: 9163
SecurityFocus: 4810 - SSH Communications Secure Shell Server AllowedAuthentications Configuration Overriding Vulnerability
Vulnerability Center: 1338 - SSH \, Medium

Entryinfo

Created: 08/04/2014 11:36
Updated: 09/03/2025 10:21
Changes: 08/04/2014 11:36 (64), 05/10/2019 14:16 (4), 11/18/2024 07:43 (17), 09/03/2025 10:21 (2)
Complete: 🔍
Cache ID: 216::103

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

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