OpenSSH up to 6.6 Fingerprint Record Check sshconnect.c verify_host_key HostCertificate input validation

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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4.7$5k-$25k0.00

Summaryinfo

A vulnerability described as critical has been identified in OpenSSH up to 6.6. This affects the function verify_host_key of the file sshconnect.c of the component Fingerprint Record Check. Executing a manipulation as part of HostCertificate can lead to input validation. The identification of this vulnerability is CVE-2014-2653. There is no exploit available.

Detailsinfo

A vulnerability was found in OpenSSH up to 6.6 (Connectivity Software). It has been declared as critical. This vulnerability affects the function verify_host_key of the file sshconnect.c of the component Fingerprint Record Check. The manipulation as part of a HostCertificate leads to a input validation vulnerability. The CWE definition for the vulnerability is CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. As an impact it is known to affect integrity. CVE summarizes:

The verify_host_key function in sshconnect.c in the client in OpenSSH 6.6 and earlier allows remote servers to trigger the skipping of SSHFP DNS RR checking by presenting an unacceptable HostCertificate.

The weakness was shared 03/26/2014 by Matthew Vernon (oss-sec). The advisory is shared for download at openwall.com. This vulnerability was named CVE-2014-2653 since 03/26/2014. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $5k-$25k (estimation calculated on 06/16/2021).

The vulnerability scanner Nessus provides a plugin with the ID 73401 (Ubuntu 12.04 LTS / 12.10 / 13.10 : openssh vulnerability (USN-2164-1)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Ubuntu Local Security Checks. The commercial vulnerability scanner Qualys is able to test this issue with plugin 185093 (HP-UX running HP Secure Shell Multiple Vulnerabilities (HPSBUX03188)).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the databases at X-Force (92116), Tenable (73401), SecurityFocus (BID 66459†), Secunia (SA59855†) and SecurityTracker (ID 1029971†). The entries VDB-12124, VDB-12683, VDB-82642 and VDB-92825 are related to this item. Once again VulDB remains the best source for vulnerability data.

Productinfo

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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: 4.7

VulDB Base Score: 5.3
VulDB Temp Score: 4.7
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

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

NVD Base Score: 🔍

Exploitinginfo

Class: Input validation
CWE: CWE-20
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Unproven

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 73401
Nessus Name: Ubuntu 12.04 LTS / 12.10 / 13.10 : openssh vulnerability (USN-2164-1)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Port: 🔍

OpenVAS ID: 702894
OpenVAS Name: Debian Security Advisory DSA 2894-1 (openssh - security update
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

03/24/2014 🔍
03/24/2014 +0 days 🔍
03/26/2014 +2 days 🔍
03/26/2014 +0 days 🔍
03/27/2014 +1 days 🔍
03/27/2014 +0 days 🔍
03/28/2014 +1 days 🔍
03/31/2014 +3 days 🔍
04/08/2014 +8 days 🔍
06/16/2021 +2626 days 🔍

Sourcesinfo

Advisory: openwall.com
Researcher: Matthew Vernon
Status: Not defined
Confirmation: 🔍

CVE: CVE-2014-2653 (🔍)
GCVE (CVE): GCVE-0-2014-2653
GCVE (VulDB): GCVE-100-12724

OVAL: 🔍

X-Force: 92116 - OpenSSH HostCertificate security bypass, Medium Risk
SecurityFocus: 66459 - OpenSSH Certificate Validation Security Bypass Vulnerability
Secunia: 59855
SecurityTracker: 1029971 - OpenSSH DNS SSH Fingerprint Record Check Can Be Bypassed By Remote Users
Vulnerability Center: 43763 - OpenSSH Client Remote Security Bypass by Crafted Server via DNS SSHFP, Medium

See also: 🔍

Entryinfo

Created: 03/31/2014 15:06
Updated: 06/16/2021 10:46
Changes: 03/31/2014 15:06 (79), 05/24/2017 10:36 (6), 06/16/2021 10:46 (3)
Complete: 🔍
Cache ID: 216:F59:103

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