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Gentoo Linux Security Advisory GLSA 200608-12 |
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http://security.gentoo.org/ |
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|
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Severity: High |
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Title: x11vnc: Authentication bypass in included LibVNCServer code |
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Date: August 07, 2006 |
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Bugs: #142559 |
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ID: 200608-12 |
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|
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Synopsis |
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======== |
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|
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VNC servers created with x11vnc accept insecure protocol types, even |
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when the server does not offer it, resulting in the possibility of |
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unauthorized access to the server. |
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|
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Background |
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========== |
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|
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x11vnc provides VNC servers for X displays. |
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|
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Affected packages |
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================= |
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|
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------------------------------------------------------------------- |
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Package / Vulnerable / Unaffected |
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------------------------------------------------------------------- |
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1 x11-misc/x11vnc < 0.8.1 >= 0.8.1 |
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|
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Description |
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=========== |
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|
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x11vnc includes vulnerable LibVNCServer code, which fails to properly |
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validate protocol types effectively letting users decide what protocol |
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to use, such as "Type 1 - None" (GLSA-200608-05). x11vnc will accept |
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this security type, even if it is not offered by the server. |
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|
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Impact |
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====== |
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|
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An attacker could exploit this vulnerability to gain unauthorized |
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access with the privileges of the user running the VNC server. |
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|
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Workaround |
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========== |
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There is no known workaround at this time. |
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|
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Resolution |
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========== |
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All x11vnc users should upgrade to the latest version: |
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# emerge --sync |
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# emerge --ask --oneshot --verbose ">=x11-misc/x11vnc-0.8.1" |
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|
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References |
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========== |
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|
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[ 1 ] CVE-2006-2450 |
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http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-2450 |
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[ 2 ] GLSA-200608-05 |
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http://www.gentoo.org/security/en/glsa/glsa-200608-05.xml |
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|
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Availability |
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============ |
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|
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This GLSA and any updates to it are available for viewing at |
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the Gentoo Security Website: |
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|
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http://security.gentoo.org/glsa/glsa-200608-12.xml |
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|
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Concerns? |
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========= |
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|
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Security is a primary focus of Gentoo Linux and ensuring the |
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confidentiality and security of our users machines is of utmost |
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importance to us. Any security concerns should be addressed to |
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security@g.o or alternatively, you may file a bug at |
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http://bugs.gentoo.org. |
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|
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License |
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======= |
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|
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Copyright 2006 Gentoo Foundation, Inc; referenced text |
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belongs to its owner(s). |
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|
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The contents of this document are licensed under the |
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Creative Commons - Attribution / Share Alike license. |
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|
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http://creativecommons.org/licenses/by-sa/2.5 |