ID de Prueba:	1.3.6.1.4.1.25623.1.0.51214
Categoría:	Red Hat Local Security Checks
Título:	RedHat Security Advisory RHSA-2002:287
Resumen:	NOSUMMARY
Descripción:	Description: The remote host is missing updates announced in advisory RHSA-2002:287. 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: Please note that this update is available via Red Hat Network. To use Red Hat Network, launch the Red Hat Update Agent with the following command: up2date http://rhn.redhat.com/errata/RHSA-2002-287.html http://marc.theaimsgroup.com/?l=bugtraq&m=102753170201524 Risk factor : High CVSS Score: 7.5
Referencia Cruzada:	BugTraq ID: 5296 Common Vulnerability Exposure (CVE) ID: CVE-2002-1336 http://www.securityfocus.com/bid/5296 Bugtraq: 20020724 VNC authentication weakness (Google Search) http://marc.info/?l=bugtraq&m=102753170201524&w=2 Bugtraq: 20020726 RE: VNC authentication weakness (Google Search) http://marc.info/?l=bugtraq&m=102769183913594&w=2 Conectiva Linux advisory: CLA-2003:640 http://distro.conectiva.com.br/atualizacoes/?id=a&anuncio=000640 http://www.mandrakesoft.com/security/advisories?name=MDKSA-2003:022 http://www.redhat.com/support/errata/RHSA-2002-287.html http://www.redhat.com/support/errata/RHSA-2003-041.html XForce ISS Database: vnc-weak-authentication(5992) https://exchange.xforce.ibmcloud.com/vulnerabilities/5992
Copyright	Copyright (c) 2005 E-Soft Inc. http://www.securityspace.com

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