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Moderately critical

Dropbear SSH Server User Enumeration Weakness and Denial of Service Vulnerability

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Release Date:  2013-10-11    Last Update:  2013-10-16    Views:  3,898

Secunia Advisory SA55173

Where:

From remote

Impact:

Exposure of sensitive information, DoS

Solution Status:

Vendor Patch

CVE Reference(s):

Description


A weakness and a vulnerability have been reported in Dropbear SSH Server, which can be exploited by malicious people to disclose certain sensitive information and cause a DoS (Denial of Service).

1) A timing error when authenticating users can be exploited to e.g. enumerate valid user names.

2) An error in the "buf_decompress()" function (packet.c) when handling compressed payloads can be exploited to e.g. exhaust available memory resources by sending a specially crafted packet.

The weakness and the vulnerability are reported in versions prior to 2013.59.


Solution:
Update to version 2013.59.

Provided and/or discovered by:
The vendor credits Logan Lamb.

Original Advisory:
https://matt.ucc.asn.au/dropbear/CHANGES

Deep Links:
Links available to Secunia VIM customers

Do you have additional information related to this advisory?

Please provide information about patches, mitigating factors, new versions, exploits, faulty patches, links, and other relevant data by posting comments to this Advisory. You can also send this information to vuln@secunia.com

Subject: Dropbear SSH Server User Enumeration Weakness and Denial of Service Vulnerability

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