Vulnerability identifier: #VU70395

Vulnerability risk: Medium

CVSSv3.1: 4.8 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N/E:P/RL:O/RC:C]

CVE-ID: CVE-2003-0190

CWE-ID: CWE-208

Exploitation vector: Network

Exploit availability: Yes

Vulnerable software:
OpenSSH
Server applications / Remote management servers, RDP, SSH

Vendor: OpenSSH

Description

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to the affected application sends an error message when a user does not exist. A remote attacker can determine valid usernames via a timing attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

OpenSSH: 3.0.1p1 - 3.6.1p1

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External links
http://www.securityfocus.com/bid/7467
http://lists.grok.org.uk/pipermail/full-disclosure/2003-April/004815.html
http://lab.mediaservice.net/advisory/2003-01-openssh.txt
http://www.redhat.com/support/errata/RHSA-2003-222.html
http://www.redhat.com/support/errata/RHSA-2003-224.html
http://www.turbolinux.com/security/TLSA-2003-31.txt
http://marc.info/?l=bugtraq&m=105172058404810&w=2
http://marc.info/?l=bugtraq&m=106018677302607&w=2
http://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A445

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.