ID

VAR-201203-0221

CVE

CVE-2012-0358

TITLE

Cisco AnyConnect Clientless SSL VPN Portforwarder ActiveX control buffer overflow

DESCRIPTION

Buffer overflow in the Cisco Port Forwarder ActiveX control in cscopf.ocx, as distributed through the Clientless VPN feature on Cisco Adaptive Security Appliances (ASA) 5500 series devices with software 7.0 through 7.2 before 7.2(5.6), 8.0 before 8.0(5.26), 8.1 before 8.1(2.53), 8.2 before 8.2(5.18), 8.3 before 8.3(2.28), 8.2 before 8.4(2.16), and 8.6 before 8.6(1.1), allows remote attackers to execute arbitrary code via unspecified vectors, aka Bug ID CSCtr00165. The problem is Bug ID CSCtr00165 It is a problem.A third party may execute arbitrary code. Failed exploit attempts may result in a denial-of-service condition. ---------------------------------------------------------------------- Become a PSI 3.0 beta tester! Test-drive the new beta version and tell us what you think about its extended automatic update function and significantly enhanced user-interface. Download it here! http://secunia.com/psi_30_beta_launch ---------------------------------------------------------------------- TITLE: Cisco Adaptive Security Appliances Port Forwarder ActiveX Control Buffer Overflow Vulnerability SECUNIA ADVISORY ID: SA48422 VERIFY ADVISORY: Secunia.com http://secunia.com/advisories/48422/ Customer Area (Credentials Required) https://ca.secunia.com/?page=viewadvisory&vuln_id=48422 RELEASE DATE: 2012-03-15 DISCUSS ADVISORY: http://secunia.com/advisories/48422/#comments AVAILABLE ON SITE AND IN CUSTOMER AREA: * Last Update * Popularity * Comments * Criticality Level * Impact * Where * Solution Status * Operating System / Software * CVE Reference(s) http://secunia.com/advisories/48422/ ONLY AVAILABLE IN CUSTOMER AREA: * Authentication Level * Report Reliability * Secunia PoC * Secunia Analysis * Systems Affected * Approve Distribution * Remediation Status * Secunia CVSS Score * CVSS https://ca.secunia.com/?page=viewadvisory&vuln_id=48422 ONLY AVAILABLE WITH SECUNIA CSI AND SECUNIA PSI: * AUTOMATED SCANNING http://secunia.com/vulnerability_scanning/personal/ http://secunia.com/vulnerability_scanning/corporate/wsus_sccm_3rd_third_party_patching/ DESCRIPTION: A vulnerability has been reported in Cisco Adaptive Security Appliances, which can be exploited by malicious people to compromise a user's system. PROVIDED AND/OR DISCOVERED BY: Will Dormann, CERT/CC. ORIGINAL ADVISORY: Cisco: http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20120314-asaclient US-CERT: http://www.kb.cert.org/vuls/id/339177 OTHER REFERENCES: Further details available in Customer Area: http://secunia.com/vulnerability_intelligence/ DEEP LINKS: Further details available in Customer Area: http://secunia.com/vulnerability_intelligence/ EXTENDED DESCRIPTION: Further details available in Customer Area: http://secunia.com/vulnerability_intelligence/ EXTENDED SOLUTION: Further details available in Customer Area: http://secunia.com/vulnerability_intelligence/ EXPLOIT: Further details available in Customer Area: http://secunia.com/vulnerability_intelligence/ ---------------------------------------------------------------------- About: This Advisory was delivered by Secunia as a free service to help private users keeping their systems up to date against the latest vulnerabilities. Subscribe: http://secunia.com/advisories/secunia_security_advisories/ Definitions: (Criticality, Where etc.) http://secunia.com/advisories/about_secunia_advisories/ Please Note: Secunia recommends that you verify all advisories you receive by clicking the link. Secunia NEVER sends attached files with advisories. Secunia does not advise people to install third party patches, only use those supplied by the vendor. Microsoft Windows-based systems that are running Internet Explorer or another browser that supports Microsoft ActiveX technology may be affected if the system has ever connected to a device that is running the Cisco Clientless VPN solution. The affected ActiveX control is distributed to endpoint systems by Cisco ASA. However, the impact of successful exploitation of this vulnerability is to the endpoint system only and does not compromise Cisco ASA devices. Cisco has released free software updates that address this vulnerability. Workarounds that mitigate this vulnerability are available. Customers who are using Cisco ASA Software version 7.0 or 7.1 should contact their Cisco support team for assistance in upgrading to a supported version of Cisco ASA Software. Note: The affected implementation of the Cisco Clientless VPN solution was introduced with the release of Cisco ASA Software version 7.1. This issue does not affect devices running Cisco PIX Software. Administrators may determine whether the Cisco Clientless VPN solution is enabled on their devices by issuing the "show running-config webvpn" command. The following example shows the response when the Cisco Clientless VPN solution is enabled: ciscoasa# show running-config webvpn webvpn enable outside End user systems running Microsoft Windows may be affected if they have used the Cisco Clientless VPN feature on an affected device from a browser that supports ActiveX technology. Devices that contain the cscopf.ocx ActiveX control registered with a class ID (CLSID) of {B8E73359-3422-4384-8D27-4EA1B4C01232} are affected. The affected controls are marked both Safe for Scripting (SFS) and Safe for Initialization (SFI), which may present additional attack vectors when a system has registered and cached the affected control. The Cisco Clientless VPN feature allows users to use a web browser to create an SSL VPN tunnel from an endpoint device to a Cisco ASA device. When connected, the ASA pushes several ActiveX and Java applications to the endpoint device to allow a number of features to operate. The attacker-supplied code would be executed with the privileges of the user who invoked the browser used to visit the attacker-controlled website. If the user has administrative privileges, a complete compromise may occur. Affected endpoint systems will need to disable the control via one of the methods suggested in the "Workarounds" section of this document. When loaded on an endpoint system, the affected control has a binary name of cscopf.ocx and is registered on a system with a CLSID of {B8E73359-3422-4384-8D27-4EA1B4C01232}. Fixed versions of the cscopf.ocx control are registered with CLSID {C861B75F-EE32-4aa4-B610-281AF26A8D1C}. Cisco is requesting that Microsoft set a global kill bit for this control in a future Microsoft kill-bit update. After this update occurs, the affected control will stop operating on all affected endpoint systems that load the Microsoft-provided update. This issue is documented in Cisco bug ID CSCtr00165 and has been assigned Common Vulnerabilities and Exposures (CVE) ID CVE-2012-0358. Vulnerability Scoring Details ============================= Cisco has scored the vulnerability in this advisory based on the Common Vulnerability Scoring System (CVSS). The CVSS scoring in this security advisory is in accordance with CVSS version 2.0. CVSS is a standards-based scoring method that conveys vulnerability severity and helps organizations determine the urgency and priority of a response. Cisco has provided a base and temporal score. Customers can also compute environmental scores that help determine the impact of the vulnerability in their own networks. Cisco has provided additional information regarding CVSS at the following link: http://www.cisco.com/web/about/security/intelligence/cvss-qandas.html Cisco has also provided a CVSS calculator to compute the environmental impact for individual networks at the following link: http://intellishield.cisco.com/security/alertmanager/cvss * CSCtr00165 ("Cisco Clientless VPN Port Forwarder ActiveX Control Remote Code Execution Vulnerability") CVSS Base Score - 9.3 Access Vector - Network Access Complexity - Medium Authentication - None Confidentiality Impact - Complete Integrity Impact - Complete Availability Impact - Complete CVSS Temporal Score - 7.7 Exploitability - Functional Remediation Level - Official-Fix Report Confidence - Confirmed Impact ====== Successful exploitation of the vulnerability may allow a remote, unauthenticated attacker to execute arbitrary code on the affected end-user system with the privileges of the user who invoked the web browser. If the user has administrative privileges, code execution may result in a complete compromise of the affected system. Software Versions and Fixes =========================== When considering software upgrades, customers are advised to consult the Cisco Security Advisories and Responses archive at http://www.cisco.com/go/psirt and review subsequent advisories to determine exposure and a complete upgrade solution. In all cases, customers should ensure that the devices to be upgraded contain sufficient memory and confirm that current hardware and software configurations will continue to be supported properly by the new release. If the information is not clear, customers are advised to contact the Cisco Technical Assistance Center (TAC) or their contracted maintenance providers. +---------------------------------------------------------------+ |Affected | First Fixed | Recommended Release | |Version |Release | | |--------------+-----------------+------------------------------| |Cisco ASA 7.0 |Not Vulnerable |Migrate to 7.2 or later | |--------------+-----------------+------------------------------| |Cisco ASA 7.1 |Vulnerable |Vulnerable; Migrate to 7.2 or | | | |later | |--------------+-----------------+------------------------------| |Cisco ASA 7.2 | 7.2(5.6) |7.2(5.7) | |--------------+-----------------+------------------------------| |Cisco ASA 8.0 |8.0(5.26) |Migrate to 8.2(5.26) or later | |--------------+-----------------+------------------------------| |Cisco ASA 8.1 | 8.1(2.53) |Migrate to 8.2(5.26) or later | |--------------+-----------------+------------------------------| |Cisco ASA 8.2 | 8.2(5.18) |8.2(5.26) | |--------------+-----------------+------------------------------| |Cisco ASA 8.3 | 8.3(2.28) |Migrate to 8.4(3.8) or later | |--------------+-----------------+------------------------------| |Cisco ASA 8.4 |8.4(2.16) |8.4(3.8) | |--------------+-----------------+------------------------------| |Cisco ASA 8.5 |Not Vulnerable |8.5(1.7) | |--------------+-----------------+------------------------------| |Cisco ASA 8.6 |8.6(1.1) |8.6(1.1) | +---------------------------------------------------------------+ Note: Cisco ASA Software version 7.0 and 7.1 have reached end of software maintenance. Customers who are using Cisco ASA Software version 7.0 or 7.1 should contact their Cisco support team for assistance in upgrading to a supported version of Cisco ASA Software. Note: The recommended releases contain the fixes for all vulnerabilities for all the advisories published in the publication. Cisco recommends upgrading to a release that is equal to or later than these recommended releases. Affected endpoint systems will need to download the fixed version by connecting to a Cisco ASA device that is running fixed software via the Cisco Clientless Web solution or disable the affected control via one of the methods mentioned in the "Workarounds" section of this document. Workarounds =========== End users or administrators may mitigate Internet Explorer as an attack vector by setting the kill bit for the affected ActiveX control. This can be achieved by modifying the registry either directly on the affected machine or via an Active Directory Group Policy. Warning: Incorrectly modifying the system registry of a Microsoft Windows-based device may cause serious problems. Neither Cisco nor Microsoft can guarantee that you can resolve problems that may result from improper registry modification from either applying the registry changes via a .reg file or by using the Registry Editor incorrectly. Modify the registry of your system at your own risk. To set the kill bit for the CLSID with a value of {B8E73359-3422-4384-8D27-4EA1B4C01232}, paste the following text in a text editor such as Notepad. Save the file using the .reg filename extension. Windows Registry Editor Version 5.00 [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\ActiveX Compatibility\{B8E73359-3422-4384-8D27-4EA1B4C01232}] "Compatibility Flags"=dword:04000400 [HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Internet Explorer\ActiveX Compatibility\{B8E73359-3422-4384-8D27-4EA1B4C01232}] "Compatibility Flags"=dword:04000400 End users can apply this .reg file to individual systems by double-clicking the file. Administrators can also apply the registry change across domains by using Group Policy. You can find more information about using Group Policy in the following Microsoft TechNet article: Group Policy Collection When the registry change has been applied, Microsoft Internet Explorer must be restarted for the changes to take effect. Once the kill bit has been set, the affected control will no longer be accessible by the Cisco Clientless VPN system or a malicious web page when accessed by Internet Explorer. One common component that may stop operating is the ActiveX RDP plug-in. Mitigations that can be deployed on Cisco devices in a network are available in the Cisco Applied Intelligence companion document for this advisory: http://tools.cisco.com/security/center/content/CiscoAppliedMitigationBulletin/cisco-amb-20120314-asaclient Obtaining Fixed Software ======================== Cisco has released free software updates that address the vulnerability described in this advisory. Prior to deploying software, customers are advised to consult their maintenance providers or check the software for feature set compatibility and known issues that are specific to their environments. Customers may only install and expect support for feature sets they have purchased. By installing, downloading, accessing, or otherwise using such software upgrades, customers agree to follow the terms of the Cisco software license at http://www.cisco.com/en/US/docs/general/warranty/English/EU1KEN_.html, or as set forth at http://www.cisco.com/public/sw-center/sw-usingswc.shtml. Do not contact psirt@cisco.com or security-alert@cisco.com for software upgrades. Customers with Service Contracts +------------------------------- Customers with contracts should obtain upgraded software through their regular update channels. For most customers, upgrades should be obtained through the Software Center on Cisco.com at http://www.cisco.com. Customers Using Third-Party Support Organizations +------------------------------------------------ Customers with Cisco products that are provided or maintained through prior or existing agreements with third-party support organizations, such as Cisco Partners, authorized resellers, or service providers, should contact that organization for assistance with the appropriate course of action. The effectiveness of any workaround or fix depends on specific customer situations, such as product mix, network topology, traffic behavior, and organizational mission. Because of the variety of affected products and releases, customers should consult their service providers or support organizations to ensure that any applied workaround or fix is the most appropriate in the intended network before it is deployed. Customers Without Service Contracts +---------------------------------- Customers who purchase directly from Cisco but do not hold a Cisco service contract and customers who make purchases through third-party vendors but are unsuccessful in obtaining fixed software through their point of sale should obtain upgrades by contacting the Cisco Technical Assistance Center (TAC): * +1 800 553 2447 (toll free from within North America) * +1 408 526 7209 (toll call from anywhere in the world) * e-mail: tac@cisco.com Customers should have the product serial number available and be prepared to provide the URL of this advisory as evidence of entitlement to a free upgrade. Customers without service contracts should request free upgrades through the TAC. Refer to Cisco Worldwide Contacts at http://www.cisco.com/en/US/support/tsd_cisco_worldwide_contacts.html for additional TAC contact information, including localized telephone numbers, instructions, and e-mail addresses for support in various languages. Exploitation and Public Announcements ===================================== The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory. This vulnerability was reported to Cisco by Will Dormann of the CERT/CC. Status of This Notice: Final ============================ THIS DOCUMENT IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE INFORMATION ON THE DOCUMENT OR MATERIALS LINKED FROM THE DOCUMENT IS AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS DOCUMENT AT ANY TIME. A stand-alone copy or Paraphrase of the text of this document that omits the distribution URL in the following section is an uncontrolled copy, and may lack important information or contain factual errors. Distribution ============ This advisory is posted on Cisco Security Intelligence Operations at the following link: http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20120314-asaclient Additionally, a text version of this advisory is clear signed with the Cisco PSIRT PGP key and circulated among the following e-mail addresses: * cust-security-announce@cisco.com * first-bulletins@lists.first.org * bugtraq@securityfocus.com * vulnwatch@vulnwatch.org * cisco@spot.colorado.edu * cisco-nsp@puck.nether.net * full-disclosure@lists.grok.org.uk Future updates of this advisory, if any, will reside on Cisco.com but may not be announced on mailing lists. Users can monitor this advisory's URL for any updates. Revision History ================ +------------------------------------------------------------+ | Revision 1.0 | 2012-Mar-14 | Initial public release. | +------------------------------------------------------------+ Cisco Security Procedures ========================= Complete information about reporting security vulnerabilities in Cisco products, obtaining assistance with security incidents, and registering to receive security information from Cisco is available on Cisco.com at http://www.cisco.com/en/US/products/products_security_vulnerability_policy.html. This web page includes instructions for press inquiries regarding Cisco Security Advisories. All Cisco Security Advisories are available at http://www.cisco.com/go/psirt. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.11 (GNU/Linux) iF4EAREIAAYFAk9gw+sACgkQQXnnBKKRMNDtRwD9HEZMimIKp+jI/+wmveYZMmT4 /ezfjyf2ql/dxjmJNfUA/3D4zwpDyNUJeT/2H9blwnFah5/JiNZCcxhaIUGiRkwY =EnGt -----END PGP SIGNATURE-----

AFFECTED PRODUCTS

CVSS

PROBLEMTYPE DATA

THREAT TYPE

remote

TYPE

buffer overflow

CONFIGURATIONS

EXPLOIT AVAILABILITY

PATCH

EXTERNAL IDS

REFERENCES

CREDITS

Dormann

SOURCES

LAST UPDATE DATE

2024-11-23T22:08:51.703000+00:00

SOURCES UPDATE DATE

SOURCES RELEASE DATE