A vulnerability classified as critical was found in SSH up to 1.2.31 (SSH Server Software). This vulnerability affects some unknown functionality of the component Host Key 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. CVE summarizes:

SSH before 2.0 disables host key checking when connecting to the localhost, which allows remote attackers to silently redirect connections to the localhost by poisoning the client s DNS cache.

The weakness was shared 01/18/2001 as confirmed advisory (CERT.org). The advisory is available at kb.cert.org. This vulnerability was named CVE-2001-1474 since 04/21/2005. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Technical details are unknown but a public exploit is available. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 05/29/2018). This vulnerability has a historic impact due to its background and reception.

It is declared as proof-of-concept.

Upgrading to version 2.0 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at X-Force (6604). The entries 16356, 16355, 16353 and 16352 are related to this item.

Productinfo

Type

• SSH Server Software

Name

• SSH

Version

• 1.2.24
• 1.2.25
• 1.2.26
• 1.2.27
• 1.2.28
• 1.2.29
• 1.2.30
• 1.2.31

License

• open-source

CPE 2.3info

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CPE 2.2info

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