Detections
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RHEL 2.1 : vnc (RHSA-2002:287)

high Nessus Plugin ID 12339

Synopsis

The remote Red Hat host is missing one or more security updates.

Description

Updated VNC packages are available to fix a challenge replay attack that is present in the VNC server.

VNC is a tool for providing a remote graphical user interface.

The VNC DES authentication scheme is implemented using a challenge-response architecture, producing a random and different challenge for each authentication attempt.

A bug in the function for generating the random challenge caused the random seed to be reset to the current time on every authentication attempt. As a result, two authentication attempts within the same second could receive the same challenge. An eavesdropper could exploit this vulnerability by replaying the response, thereby gaining authentication.

All users of VNC are advised to upgrade to these errata packages, which contain an updated version and are not vulnerable to this issue.

Note that when using VNC on an untrusted network, always make sure to tunnel the VNC protocol through a secure, authenticated channel such as SSH. Instructions on how to tunnel VNC through SSH are provided at the following URL: http://www.uk.research.att.com/vnc/sshvnc.html

Solution

Update the affected vnc, vnc-doc and / or vnc-server packages.

See Also

https://access.redhat.com/security/cve/cve-2002-1336

https://marc.info/?l=bugtraq&m=102753170201524

https://access.redhat.com/errata/RHSA-2002:287

Plugin Details

Severity: High

ID: 12339

File Name: redhat-RHSA-2002-287.nasl

Version: 1.26

Type: local

Agent: unix

Published: 7/6/2004

Updated: 1/14/2021

Supported Sensors: Frictionless Assessment AWS, Frictionless Assessment Azure, Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 5.5

CVSS v2

Risk Factor: High

Base Score: 7.5

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P

Vulnerability Information

CPE: p-cpe:/a:redhat:enterprise_linux:vnc, p-cpe:/a:redhat:enterprise_linux:vnc-doc, p-cpe:/a:redhat:enterprise_linux:vnc-server, cpe:/o:redhat:enterprise_linux:2.1

Required KB Items: Host/local_checks_enabled, Host/RedHat/release, Host/RedHat/rpm-list, Host/cpu

Patch Publication Date: 1/15/2003

Vulnerability Publication Date: 12/11/2002

Reference Information

CVE: CVE-2002-1336

RHSA: 2002:287