Vulnerabilities > CVE-2006-2450 - Unspecified vulnerability in Libvncserver 0.7.1
Attack vector
NETWORK Attack complexity
LOW Privileges required
NONE Confidentiality impact
PARTIAL Integrity impact
PARTIAL Availability impact
PARTIAL Summary
auth.c in LibVNCServer 0.7.1 allows remote attackers to bypass authentication via a request in which the client specifies an insecure security type such as "Type 1 - None", which is accepted even if it is not offered by the server, a different issue than CVE-2006-2369.
Vulnerable Configurations
Part | Description | Count |
---|---|---|
Application | 1 |
Nessus
NASL family FreeBSD Local Security Checks NASL id FREEBSD_PKG_9DDA3FF12B0211DBA6E2000E0C2E438A.NASL description Ludwig Nussel reports that x11vnc is vulnerable to an authentication bypass vulnerability. The vulnerability is caused by an error in auth.c. This could allow a remote attacker to gain unauthorized and unauthenticated access to the system. last seen 2020-06-01 modified 2020-06-02 plugin id 22212 published 2006-08-14 reporter This script is Copyright (C) 2006-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/22212 title FreeBSD : x11vnc -- authentication bypass vulnerability (9dda3ff1-2b02-11db-a6e2-000e0c2e438a) code #%NASL_MIN_LEVEL 80502 # # (C) Tenable Network Security, Inc. # # The descriptive text and package checks in this plugin were # extracted from the FreeBSD VuXML database : # # Copyright 2003-2018 Jacques Vidrine and contributors # # Redistribution and use in source (VuXML) and 'compiled' forms (SGML, # HTML, PDF, PostScript, RTF and so forth) with or without modification, # are permitted provided that the following conditions are met: # 1. Redistributions of source code (VuXML) must retain the above # copyright notice, this list of conditions and the following # disclaimer as the first lines of this file unmodified. # 2. Redistributions in compiled form (transformed to other DTDs, # published online in any format, converted to PDF, PostScript, # RTF and other formats) must reproduce the above copyright # notice, this list of conditions and the following disclaimer # in the documentation and/or other materials provided with the # distribution. # # THIS DOCUMENTATION IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS "AS IS" # AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, # THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR # PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS # BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, # OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT # OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR # BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, # WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE # OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS DOCUMENTATION, # EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. # include("compat.inc"); if (description) { script_id(22212); script_version("1.14"); script_cvs_date("Date: 2019/08/02 13:32:38"); script_cve_id("CVE-2006-2450"); script_bugtraq_id(18977); script_name(english:"FreeBSD : x11vnc -- authentication bypass vulnerability (9dda3ff1-2b02-11db-a6e2-000e0c2e438a)"); script_summary(english:"Checks for updated package in pkg_info output"); script_set_attribute( attribute:"synopsis", value:"The remote FreeBSD host is missing a security-related update." ); script_set_attribute( attribute:"description", value: "Ludwig Nussel reports that x11vnc is vulnerable to an authentication bypass vulnerability. The vulnerability is caused by an error in auth.c. This could allow a remote attacker to gain unauthorized and unauthenticated access to the system." ); # http://bugs.debian.org/376824 script_set_attribute( attribute:"see_also", value:"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=376824" ); # https://vuxml.freebsd.org/freebsd/9dda3ff1-2b02-11db-a6e2-000e0c2e438a.html script_set_attribute( attribute:"see_also", value:"http://www.nessus.org/u?2ef70d2e" ); script_set_attribute(attribute:"solution", value:"Update the affected package."); script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P"); script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C"); script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available"); script_set_attribute(attribute:"exploit_available", value:"false"); script_set_attribute(attribute:"plugin_type", value:"local"); script_set_attribute(attribute:"cpe", value:"p-cpe:/a:freebsd:freebsd:x11vnc"); script_set_attribute(attribute:"cpe", value:"cpe:/o:freebsd:freebsd"); script_set_attribute(attribute:"vuln_publication_date", value:"2006/08/08"); script_set_attribute(attribute:"patch_publication_date", value:"2006/08/13"); script_set_attribute(attribute:"plugin_publication_date", value:"2006/08/14"); script_end_attributes(); script_category(ACT_GATHER_INFO); script_copyright(english:"This script is Copyright (C) 2006-2019 and is owned by Tenable, Inc. or an Affiliate thereof."); script_family(english:"FreeBSD Local Security Checks"); script_dependencies("ssh_get_info.nasl"); script_require_keys("Host/local_checks_enabled", "Host/FreeBSD/release", "Host/FreeBSD/pkg_info"); exit(0); } include("audit.inc"); include("freebsd_package.inc"); if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED); if (!get_kb_item("Host/FreeBSD/release")) audit(AUDIT_OS_NOT, "FreeBSD"); if (!get_kb_item("Host/FreeBSD/pkg_info")) audit(AUDIT_PACKAGE_LIST_MISSING); flag = 0; if (pkg_test(save_report:TRUE, pkg:"x11vnc<0.8.2")) flag++; if (flag) { if (report_verbosity > 0) security_hole(port:0, extra:pkg_report_get()); else security_hole(0); exit(0); } else audit(AUDIT_HOST_NOT, "affected");
NASL family SuSE Local Security Checks NASL id SUSE_LIBVNCSERVER-1667.NASL description Modified clients could bypass authentication of password protected VNC servers (CVE-2006-2450). last seen 2020-06-01 modified 2020-06-02 plugin id 27111 published 2007-10-17 reporter This script is Copyright (C) 2007-2019 Tenable Network Security, Inc. source https://www.tenable.com/plugins/nessus/27111 title openSUSE 10 Security Update : LibVNCServer (LibVNCServer-1667) code #%NASL_MIN_LEVEL 80502 # # (C) Tenable Network Security, Inc. # # The descriptive text and package checks in this plugin were # extracted from openSUSE Security Update LibVNCServer-1667. # # The text description of this plugin is (C) SUSE LLC. # include("compat.inc"); if (description) { script_id(27111); script_version ("1.12"); script_cvs_date("Date: 2019/10/25 13:36:28"); script_cve_id("CVE-2006-2450"); script_name(english:"openSUSE 10 Security Update : LibVNCServer (LibVNCServer-1667)"); script_summary(english:"Check for the LibVNCServer-1667 patch"); script_set_attribute( attribute:"synopsis", value:"The remote openSUSE host is missing a security update." ); script_set_attribute( attribute:"description", value: "Modified clients could bypass authentication of password protected VNC servers (CVE-2006-2450)." ); script_set_attribute( attribute:"solution", value:"Update the affected LibVNCServer package." ); script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P"); script_set_attribute(attribute:"plugin_type", value:"local"); script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:LibVNCServer"); script_set_attribute(attribute:"cpe", value:"cpe:/o:novell:opensuse:10.1"); script_set_attribute(attribute:"patch_publication_date", value:"2006/06/18"); script_set_attribute(attribute:"plugin_publication_date", value:"2007/10/17"); script_end_attributes(); script_category(ACT_GATHER_INFO); script_copyright(english:"This script is Copyright (C) 2007-2019 Tenable Network Security, Inc."); script_family(english:"SuSE Local Security Checks"); script_dependencies("ssh_get_info.nasl"); script_require_keys("Host/local_checks_enabled", "Host/SuSE/release", "Host/SuSE/rpm-list", "Host/cpu"); exit(0); } include("audit.inc"); include("global_settings.inc"); include("rpm.inc"); if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED); release = get_kb_item("Host/SuSE/release"); if (isnull(release) || release =~ "^(SLED|SLES)") audit(AUDIT_OS_NOT, "openSUSE"); if (release !~ "^(SUSE10\.1)$") audit(AUDIT_OS_RELEASE_NOT, "openSUSE", "10.1", release); if (!get_kb_item("Host/SuSE/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING); ourarch = get_kb_item("Host/cpu"); if (!ourarch) audit(AUDIT_UNKNOWN_ARCH); if (ourarch !~ "^(i586|i686|x86_64)$") audit(AUDIT_ARCH_NOT, "i586 / i686 / x86_64", ourarch); flag = 0; if ( rpm_check(release:"SUSE10.1", reference:"LibVNCServer-0.7.99-15.3") ) flag++; if (flag) { if (report_verbosity > 0) security_hole(port:0, extra:rpm_report_get()); else security_hole(0); exit(0); } else { tested = pkg_tests_get(); if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested); else audit(AUDIT_PACKAGE_NOT_INSTALLED, "LibVNCServer"); }
NASL family Gentoo Local Security Checks NASL id GENTOO_GLSA-200608-12.NASL description The remote host is affected by the vulnerability described in GLSA-200608-12 (x11vnc: Authentication bypass in included LibVNCServer code) x11vnc includes vulnerable LibVNCServer code, which fails to properly validate protocol types effectively letting users decide what protocol to use, such as last seen 2020-06-01 modified 2020-06-02 plugin id 22171 published 2006-08-08 reporter This script is Copyright (C) 2006-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/22171 title GLSA-200608-12 : x11vnc: Authentication bypass in included LibVNCServer code code #%NASL_MIN_LEVEL 80502 # # (C) Tenable Network Security, Inc. # # The descriptive text and package checks in this plugin were # extracted from Gentoo Linux Security Advisory GLSA 200608-12. # # The advisory text is Copyright (C) 2001-2018 Gentoo Foundation, Inc. # and licensed under the Creative Commons - Attribution / Share Alike # license. See http://creativecommons.org/licenses/by-sa/3.0/ # include("compat.inc"); if (description) { script_id(22171); script_version("1.16"); script_cvs_date("Date: 2019/08/02 13:32:43"); script_cve_id("CVE-2006-2450"); script_xref(name:"GLSA", value:"200608-12"); script_name(english:"GLSA-200608-12 : x11vnc: Authentication bypass in included LibVNCServer code"); script_summary(english:"Checks for updated package(s) in /var/db/pkg"); script_set_attribute( attribute:"synopsis", value: "The remote Gentoo host is missing one or more security-related patches." ); script_set_attribute( attribute:"description", value: "The remote host is affected by the vulnerability described in GLSA-200608-12 (x11vnc: Authentication bypass in included LibVNCServer code) x11vnc includes vulnerable LibVNCServer code, which fails to properly validate protocol types effectively letting users decide what protocol to use, such as 'Type 1 - None' (GLSA-200608-05). x11vnc will accept this security type, even if it is not offered by the server. Impact : An attacker could exploit this vulnerability to gain unauthorized access with the privileges of the user running the VNC server. Workaround : There is no known workaround at this time." ); script_set_attribute( attribute:"see_also", value:"https://security.gentoo.org/glsa/200608-05" ); script_set_attribute( attribute:"see_also", value:"https://security.gentoo.org/glsa/200608-12" ); script_set_attribute( attribute:"solution", value: "All x11vnc users should upgrade to the latest version: # emerge --sync # emerge --ask --oneshot --verbose '>=x11-misc/x11vnc-0.8.1'" ); script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P"); script_set_attribute(attribute:"plugin_type", value:"local"); script_set_attribute(attribute:"cpe", value:"p-cpe:/a:gentoo:linux:x11vnc"); script_set_attribute(attribute:"cpe", value:"cpe:/o:gentoo:linux"); script_set_attribute(attribute:"patch_publication_date", value:"2006/08/07"); script_set_attribute(attribute:"plugin_publication_date", value:"2006/08/08"); script_end_attributes(); script_category(ACT_GATHER_INFO); script_copyright(english:"This script is Copyright (C) 2006-2019 and is owned by Tenable, Inc. or an Affiliate thereof."); script_family(english:"Gentoo Local Security Checks"); script_dependencies("ssh_get_info.nasl"); script_require_keys("Host/local_checks_enabled", "Host/Gentoo/release", "Host/Gentoo/qpkg-list"); exit(0); } include("audit.inc"); include("global_settings.inc"); include("qpkg.inc"); if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED); if (!get_kb_item("Host/Gentoo/release")) audit(AUDIT_OS_NOT, "Gentoo"); if (!get_kb_item("Host/Gentoo/qpkg-list")) audit(AUDIT_PACKAGE_LIST_MISSING); flag = 0; if (qpkg_check(package:"x11-misc/x11vnc", unaffected:make_list("ge 0.8.1"), vulnerable:make_list("lt 0.8.1"))) flag++; if (flag) { if (report_verbosity > 0) security_hole(port:0, extra:qpkg_report_get()); else security_hole(0); exit(0); } else { tested = qpkg_tests_get(); if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested); else audit(AUDIT_PACKAGE_NOT_INSTALLED, "x11vnc"); }
NASL family Gentoo Local Security Checks NASL id GENTOO_GLSA-200608-05.NASL description The remote host is affected by the vulnerability described in GLSA-200608-05 (LibVNCServer: Authentication bypass) LibVNCServer fails to properly validate protocol types effectively letting users decide what protocol to use, such as last seen 2020-06-01 modified 2020-06-02 plugin id 22147 published 2006-08-04 reporter This script is Copyright (C) 2006-2019 Tenable Network Security, Inc. source https://www.tenable.com/plugins/nessus/22147 title GLSA-200608-05 : LibVNCServer: Authentication bypass NASL family Misc. NASL id REALVNC_AUTH_BYPASS.NASL description The version of VNC server running on the remote host is affected by the following vulnerabilities : - A flaw exists in RealVNC due to an error when handling password authentication. A remote attacker can exploit this to bypass authentication by using a specially crafted request in which the client specifies an insecure security type (e.g., last seen 2020-06-01 modified 2020-06-02 plugin id 21564 published 2006-05-15 reporter This script is Copyright (C) 2006-2018 Tenable Network Security, Inc. source https://www.tenable.com/plugins/nessus/21564 title VNC Security Type Enforcement Failure Remote Authentication Bypass NASL family SuSE Local Security Checks NASL id SUSE_XEN-1841.NASL description Modified clients could bypass authentication of password protected VNC servers (CVE-2006-2450). last seen 2020-06-01 modified 2020-06-02 plugin id 27481 published 2007-10-17 reporter This script is Copyright (C) 2007-2019 Tenable Network Security, Inc. source https://www.tenable.com/plugins/nessus/27481 title openSUSE 10 Security Update : xen (xen-1841) NASL family Gentoo Local Security Checks NASL id GENTOO_GLSA-200703-19.NASL description The remote host is affected by the vulnerability described in GLSA-200703-19 (LTSP: Authentication bypass in included LibVNCServer code) The LTSP server includes vulnerable LibVNCServer code, which fails to properly validate protocol types effectively letting users decide what protocol to use, such as last seen 2020-06-01 modified 2020-06-02 plugin id 24868 published 2007-03-19 reporter This script is Copyright (C) 2007-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/24868 title GLSA-200703-19 : LTSP: Authentication bypass in included LibVNCServer code
Statements
contributor | Mark J Cox |
lastmodified | 2006-08-24 |
organization | Red Hat |
statement | Not vulnerable. This issue does not affect the versions of LibVNCServer as distributed with Red Hat Enterprise Linux 2.1, 3, or 4. |
References
- http://sourceforge.net/project/shownotes.php?release_id=431724&group_id=32584
- http://libvncserver.cvs.sourceforge.net/libvncserver/libvncserver/libvncserver/auth.c?r1=1.11&r2=1.14&diff_format=u
- http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=376824
- http://secunia.com/advisories/20940
- http://www.securityfocus.com/bid/18977
- http://www.novell.com/linux/security/advisories/2006_42_kernel.html
- http://secunia.com/advisories/21179
- http://security.gentoo.org/glsa/glsa-200608-05.xml
- http://security.gentoo.org/glsa/glsa-200608-12.xml
- http://secunia.com/advisories/21349
- http://secunia.com/advisories/21393
- http://secunia.com/advisories/21405
- http://security.gentoo.org/glsa/glsa-200703-19.xml
- http://secunia.com/advisories/24525
- http://www.vupen.com/english/advisories/2006/2797
- http://www.securityfocus.com/archive/1/442986/100/0/threaded
- http://seclists.org/fulldisclosure/2022/May/29