pam_ssh 1.91 Password Encryption allow_blank_password improper authentication

CVSS Meta Temp Score
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CTI Interest Score
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4.3$0-$5k0.00

Summaryinfo

A vulnerability was found in pam_ssh 1.91. It has been rated as problematic. Affected by this issue is the function allow_blank_password of the component Password Encryption Handler. This manipulation causes improper authentication. This vulnerability is registered as CVE-2007-0844. No exploit is available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in pam_ssh 1.91. It has been declared as problematic. Affected by this vulnerability is the function allow_blank_password of the component Password Encryption Handler. 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, and integrity. The summary by CVE is:

The auth_via_key function in pam_ssh.c in pam_ssh before 1.92, when the allow_blank_passphrase option is disabled, allows remote attackers to bypass authentication restrictions and use private encryption keys requiring a blank passphrase by entering a non-blank passphrase.

The bug was discovered 02/06/2007. The weakness was published 02/08/2007 by Rob Henderson (Website). The advisory is shared at sourceforge.net. This vulnerability is known as CVE-2007-0844 since 02/08/2007. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details are known, but no exploit is available.

It is declared as proof-of-concept. The vulnerability was handled as a non-public zero-day exploit for at least 2 days. During that time the estimated underground price was around $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 27735 (Fedora 7 : pam_ssh-1.92-2.fc7 (2007-1793)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Fedora Local Security Checks and running in the context l.

Upgrading eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at sourceforge.net. The best possible mitigation is suggested to be upgrading to the latest version. A possible mitigation has been published 7 months after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at X-Force (32411), Tenable (27735), SecurityFocus (BID 22461†), OSVDB (33119†) and Secunia (SA24061†). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.8
VulDB Meta Temp Score: 4.3

VulDB Base Score: 4.8
VulDB Temp Score: 4.3
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: Proof-of-Concept

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 27735
Nessus Name: Fedora 7 : pam_ssh-1.92-2.fc7 (2007-1793)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍
Nessus Port: 🔍

OpenVAS ID: 861078
OpenVAS Name: Family Connections argv[1] Parameter Remote Arbitrary Command Execution Vulnerability
OpenVAS File: 🔍
OpenVAS Family: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

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

Patch: sourceforge.net

Timelineinfo

11/07/2006 🔍
02/06/2007 +91 days 🔍
02/06/2007 +0 days 🔍
02/08/2007 +2 days 🔍
02/08/2007 +0 days 🔍
02/08/2007 +0 days 🔍
02/08/2007 +0 days 🔍
02/08/2007 +0 days 🔍
02/12/2007 +3 days 🔍
08/23/2007 +192 days 🔍
11/06/2007 +75 days 🔍
11/13/2007 +7 days 🔍
07/30/2019 +4277 days 🔍

Sourcesinfo

Advisory: sourceforge.net
Researcher: Rob Henderson
Status: Not defined
Confirmation: 🔍

CVE: CVE-2007-0844 (🔍)
GCVE (CVE): GCVE-0-2007-0844
GCVE (VulDB): GCVE-100-2905
X-Force: 32411
SecurityFocus: 22461 - Pam_ssh Blank Passphrase Restriction Authentication Bypass Vulnerability
Secunia: 24061
OSVDB: 33119 - pam_ssh auth_via_key Function allow_blank_passphrase Option Bypass
Vulnerability Center: 16807 - Pam_ssh Auth_via_key Function Allows Remote Attackers to Bypass Authentication Restrictions, Medium
Vupen: ADV-2007-0524

Entryinfo

Created: 02/12/2007 12:29
Updated: 07/30/2019 10:31
Changes: 02/12/2007 12:29 (89), 07/30/2019 10:31 (2)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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