Executive Summary
Summary | |
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Title | libvncserver security update |
Informations | |||
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Name | RHSA-2014:1826 | First vendor Publication | 2014-11-11 |
Vendor | RedHat | Last vendor Modification | 2014-11-11 |
Severity (Vendor) | Moderate | Revision | 01 |
Security-Database Scoring CVSS v3
Cvss vector : N/A | |||
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Overall CVSS Score | NA | ||
Base Score | NA | Environmental Score | NA |
impact SubScore | NA | Temporal Score | NA |
Exploitabality Sub Score | NA | ||
Calculate full CVSS 3.0 Vectors scores |
Security-Database Scoring CVSS v2
Cvss vector : (AV:N/AC:L/Au:N/C:P/I:P/A:P) | |||
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Cvss Base Score | 7.5 | Attack Range | Network |
Cvss Impact Score | 6.4 | Attack Complexity | Low |
Cvss Expoit Score | 10 | Authentication | None Required |
Calculate full CVSS 2.0 Vectors scores |
Detail
Problem Description: Updated libvncserver packages that fix multiple security issues are now available for Red Hat Enterprise Linux 6 and 7. Red Hat Product Security has rated this update as having Moderate security impact. Common Vulnerability Scoring System (CVSS) base scores, which give detailed severity ratings, are available for each vulnerability from the CVE links in the References section. 2. Relevant releases/architectures: Red Hat Enterprise Linux Client (v. 7) - x86_64 Red Hat Enterprise Linux Client Optional (v. 7) - x86_64 Red Hat Enterprise Linux Desktop (v. 6) - i386, x86_64 Red Hat Enterprise Linux Desktop Optional (v. 6) - i386, x86_64 Red Hat Enterprise Linux Server (v. 6) - i386, ppc64, s390x, x86_64 Red Hat Enterprise Linux Server (v. 7) - x86_64 Red Hat Enterprise Linux Server Optional (v. 6) - i386, ppc64, s390x, x86_64 Red Hat Enterprise Linux Server Optional (v. 7) - x86_64 Red Hat Enterprise Linux Workstation (v. 6) - i386, x86_64 Red Hat Enterprise Linux Workstation (v. 7) - x86_64 Red Hat Enterprise Linux Workstation Optional (v. 6) - i386, x86_64 Red Hat Enterprise Linux Workstation Optional (v. 7) - x86_64 3. Description: LibVNCServer is a library that allows for easy creation of VNC server or client functionality. An integer overflow flaw, leading to a heap-based buffer overflow, was found in the way screen sizes were handled by LibVNCServer. A malicious VNC server could use this flaw to cause a client to crash or, potentially, execute arbitrary code in the client. (CVE-2014-6051) A NULL pointer dereference flaw was found in LibVNCServer's framebuffer setup. A malicious VNC server could use this flaw to cause a VNC client to crash. (CVE-2014-6052) A NULL pointer dereference flaw was found in the way LibVNCServer handled certain ClientCutText message. A remote attacker could use this flaw to crash the VNC server by sending a specially crafted ClientCutText message from a VNC client. (CVE-2014-6053) A divide-by-zero flaw was found in the way LibVNCServer handled the scaling factor when it was set to "0". A remote attacker could use this flaw to crash the VNC server using a malicious VNC client. (CVE-2014-6054) Two stack-based buffer overflow flaws were found in the way LibVNCServer handled file transfers. A remote attacker could use this flaw to crash the VNC server using a malicious VNC client. (CVE-2014-6055) Red Hat would like to thank oCERT for reporting these issues. oCERT acknowledges Nicolas Ruff as the original reporter. All libvncserver users are advised to upgrade to these updated packages, which contain backported patches to correct these issues. All running applications linked against libvncserver must be restarted for this update to take effect. 4. Solution: Before applying this update, make sure all previously released errata relevant to your system have been applied. This update is available via the Red Hat Network. Details on how to use the Red Hat Network to apply this update are available at https://access.redhat.com/articles/11258 5. Bugs fixed (https://bugzilla.redhat.com/): 1144287 - CVE-2014-6051 libvncserver: integer overflow flaw, leading to a heap-based buffer overflow in screen size handling 1144288 - CVE-2014-6052 libvncserver: NULL pointer dereference flaw in framebuffer setup 1144289 - CVE-2014-6053 libvncserver: server NULL pointer dereference flaw in ClientCutText message handling 1144291 - CVE-2014-6054 libvncserver: server divide-by-zero flaw in scaling factor handling 1144293 - CVE-2014-6055 libvncserver: server stacked-based buffer overflow flaws in file transfer handling |
Original Source
Url : https://rhn.redhat.com/errata/RHSA-2014-1826.html |
CWE : Common Weakness Enumeration
% | Id | Name |
---|---|---|
40 % | CWE-189 | Numeric Errors (CWE/SANS Top 25) |
20 % | CWE-119 | Failure to Constrain Operations within the Bounds of a Memory Buffer |
20 % | CWE-20 | Improper Input Validation |
20 % | CWE-19 | Data Handling |
OVAL Definitions
Definition Id: oval:org.mitre.oval:def:27178 | |||
Oval ID: | oval:org.mitre.oval:def:27178 | ||
Title: | USN-2365-1 -- libvncserver vulnerabilities | ||
Description: | Several security issues were fixed in LibVNCServer. | ||
Family: | unix | Class: | patch |
Reference(s): | USN-2365-1 CVE-2014-6051 CVE-2014-6052 CVE-2014-6053 CVE-2014-6054 CVE-2014-6055 | Version: | 3 |
Platform(s): | Ubuntu 14.04 Ubuntu 12.04 | Product(s): | libvncserver |
Definition Synopsis: | |||
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Definition Id: oval:org.mitre.oval:def:28039 | |||
Oval ID: | oval:org.mitre.oval:def:28039 | ||
Title: | RHSA-2014:1827 -- kdenetwork security update (Moderate) | ||
Description: | The kdenetwork packages contain networking applications for the K Desktop Environment (KDE). Krfb Desktop Sharing, which is a part of the kdenetwork package, is a server application that allows session sharing between users. Krfb uses the LibVNCServer library. A NULL pointer dereference flaw was found in the way LibVNCServer handled certain ClientCutText message. A remote attacker could use this flaw to crash the VNC server by sending a specially crafted ClientCutText message from a VNC client. (CVE-2014-6053) A divide-by-zero flaw was found in the way LibVNCServer handled the scaling factor when it was set to "0". A remote attacker could use this flaw to crash the VNC server using a malicious VNC client. (CVE-2014-6054) Two stack-based buffer overflow flaws were found in the way LibVNCServer handled file transfers. A remote attacker could use this flaw to crash the VNC server using a malicious VNC client. (CVE-2014-6055) Red Hat would like to thank oCERT for reporting these issues. oCERT acknowledges Nicolas Ruff as the original reporter. Note: Prior to this update, the kdenetwork packages used an embedded copy of the LibVNCServer library. With this update, the kdenetwork packages have been modified to use the system LibVNCServer packages. Therefore, the update provided by RHSA-2014:1826 must be installed to fully address the issues in krfb described above. All kdenetwork users are advised to upgrade to these updated packages, which contain backported patches to correct these issues. All running instances of the krfb server must be restarted for this update to take effect. | ||
Family: | unix | Class: | patch |
Reference(s): | RHSA-2014:1827 CESA-2014:1827 CVE-2014-6053 CVE-2014-6054 CVE-2014-6055 | Version: | 5 |
Platform(s): | Red Hat Enterprise Linux 7 CentOS Linux 7 | Product(s): | kdenetwork |
Definition Synopsis: | |||
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Definition Id: oval:org.mitre.oval:def:28208 | |||
Oval ID: | oval:org.mitre.oval:def:28208 | ||
Title: | RHSA-2014:1826 -- libvncserver security update (Moderate) | ||
Description: | LibVNCServer is a library that allows for easy creation of VNC server or client functionality. An integer overflow flaw, leading to a heap-based buffer overflow, was found in the way screen sizes were handled by LibVNCServer. A malicious VNC server could use this flaw to cause a client to crash or, potentially, execute arbitrary code in the client. (CVE-2014-6051) A NULL pointer dereference flaw was found in LibVNCServer's framebuffer setup. A malicious VNC server could use this flaw to cause a VNC client to crash. (CVE-2014-6052) A NULL pointer dereference flaw was found in the way LibVNCServer handled certain ClientCutText message. A remote attacker could use this flaw to crash the VNC server by sending a specially crafted ClientCutText message from a VNC client. (CVE-2014-6053) A divide-by-zero flaw was found in the way LibVNCServer handled the scaling factor when it was set to "0". A remote attacker could use this flaw to crash the VNC server using a malicious VNC client. (CVE-2014-6054) Two stack-based buffer overflow flaws were found in the way LibVNCServer handled file transfers. A remote attacker could use this flaw to crash the VNC server using a malicious VNC client. (CVE-2014-6055) Red Hat would like to thank oCERT for reporting these issues. oCERT acknowledges Nicolas Ruff as the original reporter. All libvncserver users are advised to upgrade to these updated packages, which contain backported patches to correct these issues. All running applications linked against libvncserver must be restarted for this update to take effect. | ||
Family: | unix | Class: | patch |
Reference(s): | RHSA-2014:1826 CESA-2014:1826-CentOS 6 CESA-2014:1826-CentOS 7 CVE-2014-6051 CVE-2014-6052 CVE-2014-6053 CVE-2014-6054 CVE-2014-6055 | Version: | 3 |
Platform(s): | Red Hat Enterprise Linux 6 Red Hat Enterprise Linux 7 CentOS Linux 6 CentOS Linux 7 | Product(s): | libvncserver |
Definition Synopsis: | |||
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Definition Id: oval:org.mitre.oval:def:28316 | |||
Oval ID: | oval:org.mitre.oval:def:28316 | ||
Title: | ELSA-2014-1826 -- libvncserver security update (moderate) | ||
Description: | [0.9.7-7.1] - Fix CVE-2014-6051 (integer overflow in screen size handling) (bug #1157668) - Fix CVE-2014-6052 (NULL pointer dereference in framebuffer setup) (bug #1157668) - Fix CVE-2014-6053 (NULL pointer dereference in ClientCutText message handling) (bug #1157668) - Fix CVE-2014-6054 (server divide-by-zero in scaling factor handling) (bug #1157668) - Fix CVE-2014-6055 (server stacked-based buffer overflow in file transfer handling) (bug #1157668) [0.9.7-7] - Revert CVE-2011-0904 and CVE-2011-0905 patch because libvncserver is not vulnerable (bug #696767) [0.9.7-6] - Fix CVE-2011-0904 and CVE-2011-0905 in more generic way (bug #696767) [0.9.7-5] - Fix CVE-2011-0904 (bug #696767) - Fix CVE-2011-0905 (bug #696767) | ||
Family: | unix | Class: | patch |
Reference(s): | ELSA-2014-1826 CVE-2014-6051 CVE-2014-6052 CVE-2014-6053 CVE-2014-6054 CVE-2014-6055 | Version: | 3 |
Platform(s): | Oracle Linux 6 Oracle Linux 7 | Product(s): | libvncserver |
Definition Synopsis: | |||
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Definition Id: oval:org.mitre.oval:def:28422 | |||
Oval ID: | oval:org.mitre.oval:def:28422 | ||
Title: | DSA-3081-1 -- libvncserver security update | ||
Description: | Several vulnerabilities have been discovered in libvncserver, a library to implement VNC server functionality. These vulnerabilities might result in the execution of arbitrary code or denial of service in both the client and the server side. | ||
Family: | unix | Class: | patch |
Reference(s): | DSA-3081-1 CVE-2014-6051 CVE-2014-6052 CVE-2014-6053 CVE-2014-6054 CVE-2014-6055 | Version: | 3 |
Platform(s): | Debian GNU/Linux 7.0 Debian GNU/kFreeBSD 7.0 | Product(s): | libvncserver |
Definition Synopsis: | |||
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CPE : Common Platform Enumeration
Type | Description | Count |
---|---|---|
Application | 1 | |
Os | 2 | |
Os | 1 | |
Os | 2 | |
Os | 1 | |
Os | 1 | |
Os | 1 |
Snort® IPS/IDS
Date | Description |
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2015-09-23 | LibVNCServer rfbProcessClientNormalMessage msg.ssc.scale denial of service at... RuleID : 35631 - Revision : 4 - Type : SERVER-OTHER |
2015-09-23 | LibVNCServer rfbProcessClientNormalMessage msg.ssc.scale denial of service at... RuleID : 35630 - Revision : 4 - Type : SERVER-OTHER |
Nessus® Vulnerability Scanner
Date | Description |
---|---|
2016-12-13 | Name : The remote Gentoo host is missing one or more security-related patches. File : gentoo_GLSA-201612-36.nasl - Type : ACT_GATHER_INFO |
2016-10-12 | Name : The remote FreeBSD host is missing a security-related update. File : freebsd_pkg_cb3f036d8c7f11e6924a60a44ce6887b.nasl - Type : ACT_GATHER_INFO |
2016-01-04 | Name : The remote SUSE host is missing one or more security updates. File : suse_SU-2015-2088-2.nasl - Type : ACT_GATHER_INFO |
2015-12-16 | Name : The remote openSUSE host is missing a security update. File : openSUSE-2015-851.nasl - Type : ACT_GATHER_INFO |
2015-11-30 | Name : The remote SUSE host is missing one or more security updates. File : suse_SU-2015-2110-1.nasl - Type : ACT_GATHER_INFO |
2015-11-25 | Name : The remote SUSE host is missing one or more security updates. File : suse_SU-2015-2088-1.nasl - Type : ACT_GATHER_INFO |
2015-07-08 | Name : The remote Gentoo host is missing one or more security-related patches. File : gentoo_GLSA-201507-07.nasl - Type : ACT_GATHER_INFO |
2015-04-15 | Name : The remote Debian host is missing a security update. File : debian_DLA-197.nasl - Type : ACT_GATHER_INFO |
2015-03-30 | Name : The remote Mandriva Linux host is missing one or more security updates. File : mandriva_MDVSA-2015-146.nasl - Type : ACT_GATHER_INFO |
2015-02-03 | Name : The remote Red Hat host is missing one or more security updates. File : redhat-RHSA-2015-0113.nasl - Type : ACT_GATHER_INFO |
2014-12-01 | Name : The remote Debian host is missing a security-related update. File : debian_DSA-3081.nasl - Type : ACT_GATHER_INFO |
2014-11-27 | Name : The remote Mandriva Linux host is missing one or more security updates. File : mandriva_MDVSA-2014-229.nasl - Type : ACT_GATHER_INFO |
2014-11-13 | Name : The remote Scientific Linux host is missing one or more security updates. File : sl_20141111_libvncserver_on_SL6_x.nasl - Type : ACT_GATHER_INFO |
2014-11-13 | Name : The remote Scientific Linux host is missing one or more security updates. File : sl_20141111_kdenetwork_on_SL7_x.nasl - Type : ACT_GATHER_INFO |
2014-11-13 | Name : The remote CentOS host is missing one or more security updates. File : centos_RHSA-2014-1827.nasl - Type : ACT_GATHER_INFO |
2014-11-12 | Name : The remote Red Hat host is missing one or more security updates. File : redhat-RHSA-2014-1827.nasl - Type : ACT_GATHER_INFO |
2014-11-12 | Name : The remote Red Hat host is missing one or more security updates. File : redhat-RHSA-2014-1826.nasl - Type : ACT_GATHER_INFO |
2014-11-12 | Name : The remote Oracle Linux host is missing one or more security updates. File : oraclelinux_ELSA-2014-1827.nasl - Type : ACT_GATHER_INFO |
2014-11-12 | Name : The remote Oracle Linux host is missing one or more security updates. File : oraclelinux_ELSA-2014-1826.nasl - Type : ACT_GATHER_INFO |
2014-11-12 | Name : The remote CentOS host is missing one or more security updates. File : centos_RHSA-2014-1826.nasl - Type : ACT_GATHER_INFO |
2014-10-09 | Name : The remote Fedora host is missing a security update. File : fedora_2014-11464.nasl - Type : ACT_GATHER_INFO |
2014-10-06 | Name : The remote Fedora host is missing a security update. File : fedora_2014-11541.nasl - Type : ACT_GATHER_INFO |
2014-10-01 | Name : The remote Fedora host is missing a security update. File : fedora_2014-11685.nasl - Type : ACT_GATHER_INFO |
2014-09-30 | Name : The remote Ubuntu host is missing a security-related patch. File : ubuntu_USN-2365-1.nasl - Type : ACT_GATHER_INFO |
2014-09-29 | Name : The remote Fedora host is missing a security update. File : fedora_2014-11537.nasl - Type : ACT_GATHER_INFO |
2014-09-25 | Name : The remote FreeBSD host is missing a security-related update. File : freebsd_pkg_fb25333d442f11e498f35453ed2e2b49.nasl - Type : ACT_GATHER_INFO |
Alert History
Date | Informations |
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2014-12-15 21:28:27 |
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2014-11-14 13:26:31 |
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2014-11-13 13:27:25 |
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2014-11-12 00:23:11 |
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