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                                            Netskope Security Advisory

                                            NSKPSA-2024-003

                                            Endpoint DLP double-fetch leading to heap-overflow

                                            Netskope was made aware of a security vulnerability in Netskope Endpoint DLP’s Content Control Driver where a double-fetch issue leads to heap overflow. The vulnerability arises from the fact that the NumberOfBytes argument to ExAllocatePoolWithTag, and the Length argument for RtlCopyMemory, both independently dereference their value from the user supplied input buffer inside the EpdlpSetUsbAction function, known as a double-fetch. If this length value grows to a higher value in between these two calls, it will result in the RtlCopyMemory call copying user-supplied memory contents outside the range of the allocated buffer, resulting in a heap overflow. A malicious attacker will need admin privileges to exploit the issue.

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                                            Security Advisory ID: NSKPSA-2024-003
                                            Severity Rating: Medium
                                            First Communicated: Dec 19, 2024
                                            Overall CVSS Score: 5.6
                                            Version: 1.0

                                             

                                            Description
                                            Netskope was made aware of a security vulnerability in Netskope Endpoint DLP’s Content Control Driver where a double-fetch issue leads to heap overflow. The vulnerability arises from the fact that the NumberOfBytes argument to ExAllocatePoolWithTag, and the Length argument for RtlCopyMemory, both independently dereference their value from the user supplied input buffer inside the EpdlpSetUsbAction function, known as a double-fetch. If this length value grows to a higher value in between these two calls, it will result in the RtlCopyMemory call copying user-supplied memory contents outside the range of the allocated buffer, resulting in a heap overflow. A malicious attacker will need admin privileges to exploit the issue.

                                             

                                            Affected Product(s) and Version(s)
                                            Product name: Netskope Endpoint DLP
                                            Affected Platform: Windows
                                            Affected Versions: All version below R119

                                             

                                            CVE-ID(s)
                                            CVE-2024-11616

                                             

                                            Remediation
                                            Netskope has released a security patch for the issue. Please see below 

                                            • Patch versions: R119 and above
                                            • Patch backported versions: R114 and R117 

                                            Netskope download Instructions – Download Netskope Client and Scripts – Netskope Support

                                             

                                            Workaround
                                            Enabling tamperproofing using  “Protect Netskope Client Configuration and Resources” will prevent the execution of the vulnerability.

                                            Here is the guide to enable the configurations – https://docs.netskope.com/en/secure-tenant-configuration-and-hardening/#protection-of-client-resources-post-enrollment-1

                                             

                                            General Security Best Practices
                                            Netskope recommends using security hardening options available in the product and configuring them to harden the security – https://docs.netskope.com/en/secure-tenant-configuration-and-hardening/

                                             

                                            Special Notes and Acknowledgement
                                            Netskope credits Thomas Brice from Oxford Nanopore Technologies for reporting this flaw.

                                             

                                            Exploitation and Public Disclosures
                                            Netskope is not aware of any active exploitation of the security issue.

                                             

                                            Revision History

                                            VersionDateSectionNotes
                                            1.0December 18, 2024Initial Release

                                             

                                            Legal Disclaimer
                                            To the maximum extent permitted by applicable law, information provided in this notice is provided “as is” without warranty of any kind. Your use of the information in this notice or materials linked herein are at your own risk. This notice and all aspects of Netskope’s Product Security Incident Response Policy are subject to change without notice. Response is not guaranteed for any specific issue or class of issues. Your entitlements regarding warranties, support and maintenance, including vulnerabilities in any Netskope software or service, are governed solely by the applicable master agreement between Netskope and you. The statements in this notice do not modify, enlarge or otherwise amend any of your rights under the applicable master agreement, or create any additional warranties or commitments.

                                             

                                            About Netskope
                                            Netskope, the SASE leader, safely and quickly connects users directly to the internet, any application, and their infrastructure from any device, on or off the network. With CASB, SWG, and ZTNA built natively in a single platform, the Netskope Security Cloud provides the most granular context, via patented technology, to enable conditional access and user awareness while enforcing zero trust principles across data protection and threat prevention everywhere. Unlike others who force tradeoffs between security and networking, Netskope’s global security private cloud provides full compute capabilities at the edge.

                                            Netskope is fast everywhere, data-centric, and cloud-smart, all while enabling good digital citizenship and providing a lower total-cost-of-ownership.