Tectia SSH Server up to 6.3.2 SSH USERAUTH CHANGE REQUEST sshconnect2.c input_userauth_passwd_changereq improper authentication

CVSS Meta Temp Score
CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.
Current Exploit Price (≈)
Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.
CTI Interest Score
Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
9.6$0-$5k0.00

Summaryinfo

A vulnerability was found in Tectia SSH Server up to 6.3.2. It has been rated as critical. This issue affects the function input_userauth_passwd_changereq of the file sshconnect2.c of the component SSH USERAUTH CHANGE REQUEST. Performing a manipulation results in improper authentication. This vulnerability is reported as CVE-2012-5975. Moreover, an exploit is present. It is suggested to update the configuration settings.

Detailsinfo

A vulnerability, which was classified as very critical, was found in Tectia SSH Server up to 6.3.2 (SSH Server Software). This affects the function input_userauth_passwd_changereq of the file sshconnect2.c of the component SSH USERAUTH CHANGE REQUEST. 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. The summary by CVE is:

The SSH USERAUTH CHANGE REQUEST feature in SSH Tectia Server 6.0.4 through 6.0.20, 6.1.0 through 6.1.12, 6.2.0 through 6.2.5, and 6.3.0 through 6.3.2 on UNIX and Linux, when old-style password authentication is enabled, allows remote attackers to bypass authentication via a crafted session involving entry of blank passwords, as demonstrated by a root login session from a modified OpenSSH client with an added input_userauth_passwd_changereq call in sshconnect2.c.

The weakness was disclosed 12/01/2012 by kingcope as 23082 as confirmed patch (Exploit-DB). The advisory is shared at exploit-db.com. The public release happened without involvement of Tectia. This vulnerability is uniquely identified as CVE-2012-5975 since 11/21/2012. The exploitability is told to be difficult. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details and a public exploit are known. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 12/29/2024).

A public exploit has been developed by kingcope and been published immediately after the advisory. The exploit is shared for download at exploit-db.com. It is declared as highly functional. The vulnerability scanner Nessus provides a plugin with the ID 63156 (Tectia SSH Server Authentication Bypass), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Gain a shell remotely. The commercial vulnerability scanner Qualys is able to test this issue with plugin 120713 (SSH Tectia Server Authentication Security Bypass Vulnerability).

It is possible to mitigate the problem by applying the configuration setting disable "old-style" password authentication.

The vulnerability is also documented in the databases at X-Force (80454), Exploit-DB (23082), Tenable (63156), SecurityFocus (BID 56783†) and OSVDB (88103†). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

Vendor

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 9.8
VulDB Meta Temp Score: 9.6

VulDB Base Score: 9.8
VulDB Temp Score: 9.6
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
💳💳💳💳💳💳
💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock

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: 🔍
Access: Public
Status: Highly functional
Author: kingcope
Download: 🔍

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-DayUnlockUnlockUnlockUnlock
TodayUnlockUnlockUnlockUnlock

Nessus ID: 63156
Nessus Name: Tectia SSH Server Authentication Bypass
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

MetaSploit ID: tectia_passwd_changereq.rb
MetaSploit Name: Tectia SSH USERAUTH Change Request Password Reset Vulnerability
MetaSploit File: 🔍

Exploit-DB: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Config
Status: 🔍

0-Day Time: 🔍
Exploit Delay Time: 🔍

Config: disable "old-style" password authentication
McAfee IPS: 🔍
McAfee IPS Version: 🔍

Timelineinfo

11/21/2012 🔍
12/01/2012 +10 days 🔍
12/01/2012 +0 days 🔍
12/01/2012 +0 days 🔍
12/02/2012 +1 days 🔍
12/02/2012 +0 days 🔍
12/03/2012 +1 days 🔍
12/03/2012 +0 days 🔍
12/03/2012 +0 days 🔍
12/04/2012 +1 days 🔍
12/04/2012 +0 days 🔍
12/05/2012 +1 days 🔍
12/05/2012 +0 days 🔍
12/06/2012 +1 days 🔍
12/10/2012 +4 days 🔍
12/29/2024 +4402 days 🔍

Sourcesinfo

Advisory: 23082
Researcher: kingcope
Status: Confirmed

CVE: CVE-2012-5975 (🔍)
GCVE (CVE): GCVE-0-2012-5975
GCVE (VulDB): GCVE-100-7077
X-Force: 80454
SecurityFocus: 56783 - SSH Tectia Server Unauthorized Password Change Security Bypass Vulnerability
Secunia: 51456 - SSH Tectia Server Authentication Security Bypass Vulnerability, Highly Critical
OSVDB: 88103
SecurityTracker: 1027824 - SSH Tectia Server Bug in input_userauth_passwd_changereq() Lets Remote Users Gain Access to the Target System
Vulnerability Center: 37587 - SSH Tectia Server on UNIX and Linux Remote Security Bypass Vulnerability, Critical

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

Entryinfo

Created: 12/06/2012 15:39
Updated: 12/29/2024 01:50
Changes: 12/06/2012 15:39 (88), 04/22/2017 12:58 (9), 04/19/2021 18:12 (3), 10/23/2024 08:51 (14), 12/29/2024 01:50 (2)
Complete: 🔍
Committer: olku
Cache ID: 216:567:103

Discussion

No comments yet. Languages: en.

Please log in to comment.

◂ PreviousOverviewNext ▸

Do you need the next level of professionalism?

Upgrade your account now!