OpenBSD OpenSSH 2.3.1 Challenge-Response improper authentication

CVSS Meta Temp Score
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CTI Interest Score
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7.0$0-$5k0.00

Summaryinfo

A vulnerability described as critical has been identified in OpenBSD OpenSSH 2.3.1. The impacted element is an unknown function of the component Challenge-Response Handler. The manipulation results in improper authentication. This vulnerability is cataloged as CVE-2001-1585. There is no exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability, which was classified as critical, was found in OpenBSD OpenSSH 2.3.1 (Connectivity Software). Affected is an unknown code block of the component Challenge-Response Handler. The manipulation with an unknown input leads to a improper authentication vulnerability. CWE is classifying the issue as CWE-287. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

SSH protocol 2 (aka SSH-2) public key authentication in the development snapshot of OpenSSH 2.3.1, available from 2001-01-18 through 2001-02-08, does not perform a challenge-response step to ensure that the client has the proper private key, which allows remote attackers to bypass authentication as other users by supplying a public key from that user s authorized_keys file.

The weakness was shared 12/31/2001 with OpenBSD (Website). The advisory is shared for download at openbsd.org. This vulnerability is traded as CVE-2001-1585 since 10/06/2007. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are neither technical details nor an exploit publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 10608 (OpenSSH 2.3.1 SSHv2 Public Key Authentication 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 38027 (OpenSSH 2.3.1 Flawed Private Key Check Vulnerability).

Upgrading eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (10608), SecurityFocus (BID 2356†) and Vulnerability Center (SBV-303†). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

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Website

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: 10608
Nessus Name: OpenSSH 2.3.1 SSHv2 Public Key Authentication 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

01/01/2001 🔍
02/08/2001 +38 days 🔍
02/09/2001 +1 days 🔍
12/31/2001 +325 days 🔍
12/31/2001 +0 days 🔍
12/08/2002 +342 days 🔍
10/06/2007 +1763 days 🔍
07/11/2014 +2470 days 🔍
09/24/2025 +4093 days 🔍

Sourcesinfo

Vendor: openbsd.org

Advisory: openbsd.org
Organization: OpenBSD
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2001-1585 (🔍)
GCVE (CVE): GCVE-0-2001-1585
GCVE (VulDB): GCVE-100-17904
X-Force: 6084
SecurityFocus: 2356 - OpenSSH Private Key Authentication Check Vulnerability
Vulnerability Center: 303 - OpenSSH 2.3.1 Weak Authentication, High

Entryinfo

Created: 07/11/2014 13:34
Updated: 09/24/2025 05:37
Changes: 07/11/2014 13:34 (63), 05/06/2019 09:19 (5), 06/27/2021 09:05 (3), 09/24/2025 05:37 (18)
Complete: 🔍
Cache ID: 216::103

VulDB is the best source for vulnerability data and more expert information about this specific topic.

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