Security Bulletin – Skyhigh Client Proxy Update for Windows Fixes Three vulnerabilities (CVE-2024-0311, CVE-2024-0312, CVE-2024-0313)
Security Bulletins ID:
SB10418
Last Modified: 3/14/2024
Last Modified: 3/14/2024
Summary
First Published: March 14, 2024
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Article contents:
This update resolves all of the following vulnerabilities.
NOTE: The following links were not yet populated with CVE details at the time of publication of this Security Bulletin.
Remediation
To remediate this issue:
Download and Installation Instructions
Go to the Download Software site and download the applicable product update or hotfix files: Download Skyhigh Client Proxy.
Review the Release Notes and the Installation Guide for instructions on how to install these updates. All documentation is available in the Documentation tab.
Product Specific Notes
Supported Windows Installer
In the 4.9.0 release version of Skyhigh Client Proxy, there is support available only for 64-bit Windows installers. For details, see the Client Proxy 4.9.0 Release Notes.
Mitigations
SCP must be updated to version 4.9.0.
Acknowledgments
Trellix/Skyhigh Security credits smkb (smkb@smokingbit.com) for responsibly reporting CVE-2024-0311 and CVE-2024-0312 and Winston Ho (@violenttestpen) for responsibly reporting CVE-2024-0313.
Frequently Asked Questions (FAQs)
How do I know if my product is vulnerable or not?
For Endpoint Security on Windows:
Use the following instructions for endpoint or client-based products:
Use the following instructions for endpoint or client-based products:
Use the following instructions for server-based products:
Use the following instructions for Appliance-based products:
Use the following instructions:
CVSS, or Common Vulnerability Scoring System, is the result of the National Infrastructure Advisory Council's effort to standardize a system of assessing the criticality of a vulnerability. This system offers an unbiased criticality score between 0 and 10 that customers can use to judge how critical a vulnerability is and plan accordingly. For more information, visit the CVSS website.
When calculating CVSS scores, we have adopted a philosophy that fosters consistency and repeatability. Our guiding principle for CVSS scoring is to score the exploit under consideration by itself. We consider only the immediate and direct impact of the exploit under consideration. We do not factor into a score any potential follow-on exploits that might be made possible by the successful exploitation of the issue being scored.
What are the CVSS scoring metrics?
Where can I find a list of all Security Bulletins?
All Security Bulletins are published in our security centre. Security Bulletins are retired (removed) once a product is both End of Sale and End of Support (End of Life).
How do I report a product vulnerability to Trellix or Skyhigh Security?
If you have information about a security issue or vulnerability with a Trellix or Skyhigh Security product, visit the PSIRT website for instructions at KB95563 - Report a vulnerability.
How does Trellix or Skyhigh Security respond to this and any other reported security flaws?
Our key priority is the security of our customers. If a vulnerability is found within any of our software or services, we work closely with the relevant security software development team to ensure the rapid and effective development of a fix and communication plan.
We only publish Security Bulletins if they include something actionable such as a workaround, mitigation, version update, or hotfix. Otherwise, we would simply be informing the hacker community that our products are a target, putting our customers at greater risk. For products that are updated automatically, a non-actionable Security Bulletin might be published to acknowledge the discoverer.
View our PSIRT policy on the Support website at KB95564 - About the Product Security Incident Response Team (PSIRT).
Resources
To contact Technical Support, log on to the ServicePortal and go to the Open New Case page.
Disclaimer
The information provided in this Security Bulletin is provided as is without warranty of any kind. Trellix/Skyhigh Security disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Trellix/Skyhigh Security or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Trellix/Skyhigh Security or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the preceding limitation may not apply.
Any future product release dates mentioned in this Security Bulletin are intended to outline our general product direction, and they should not be relied on in making a purchasing decision. The product release dates are for information purposes only, and may not be incorporated into any contract. The product release dates are not a commitment, promise, or legal obligation to deliver any material, code, or functionality. The development, release, and timing of any features or functionality described for our products remains at our sole discretion and may be changed or canceled at any time.
| Product | Impacted Versions | CVE ID | Impact of Vulnerabilities | Severity Ratings | CVSS v3.1 Base/Temporal Scores |
| Skyhigh Client Proxy (SCP) | 4.8.1 and earlier | CVE-2024-0311 | CWE-622: Improper Validation of Function Hook Arguments | Medium | 5.5/5.0 |
| 4.8.1 and earlier | CVE-2024-0312 | CWE-622: Improper Validation of Function Hook Arguments | Medium | 5.5/5.0 | |
| 4.8.1 and earlier | CVE-2024-0313 | CWE-670: Always-Incorrect Control Flow Implementation | Medium | 5.5/5.0 | |
| Recommendations | Install or update to the latest versions listed below | ||||
| Security Bulletin Replacement | None | ||||
| Location of updated software | |||||
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Article contents:
- Vulnerability Description
- Remediation
- Product Specific Notes
- Mitigations
- Acknowledgments
- Frequently Asked Questions (FAQs)
- Resources
- Disclaimer
This update resolves all of the following vulnerabilities.
NOTE: The following links were not yet populated with CVE details at the time of publication of this Security Bulletin.
- CVE-2024-0311
A malicious insider can bypass the existing policy of Skyhigh Client Proxy without a valid release code.
- CVE-2024-0312
A malicious insider can uninstall Skyhigh Client Proxy without a valid uninstall password.
- CVE-2024-0313
A malicious insider exploiting this vulnerability can circumvent existing security controls put in place by the organization. On the contrary, if the victim is legitimately using the temporary bypass to reach out to the Internet for retrieving application and system updates, a remote device could target it and undo the bypass, thereby denying the victim access to the update service, causing it to fail.
https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2024-0313
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-0313
To remediate this issue:
- Customers on SCP versions earlier than 4.8.1 should update to version 4.9.0.
| Product | Version | Type | File Name | Release Date |
| SCP | 4.9.0 | Minor | v.4.9.0 | March 12, 2024 |
Download and Installation Instructions
Go to the Download Software site and download the applicable product update or hotfix files: Download Skyhigh Client Proxy.
Review the Release Notes and the Installation Guide for instructions on how to install these updates. All documentation is available in the Documentation tab.
Product Specific Notes
Supported Windows Installer
In the 4.9.0 release version of Skyhigh Client Proxy, there is support available only for 64-bit Windows installers. For details, see the Client Proxy 4.9.0 Release Notes.
Mitigations
SCP must be updated to version 4.9.0.
Acknowledgments
Trellix/Skyhigh Security credits smkb (smkb@smokingbit.com) for responsibly reporting CVE-2024-0311 and CVE-2024-0312 and Winston Ho (@violenttestpen) for responsibly reporting CVE-2024-0313.
Frequently Asked Questions (FAQs)
How do I know if my product is vulnerable or not?
For Endpoint Security on Windows:
Use the following instructions for endpoint or client-based products:
- Right-click the Trellix tray shield icon on the Windows taskbar.
- Select Endpoint Security.
- In the console, select Action Menu.
- In the Action Menu, select About. The product version displays.
Use the following instructions for endpoint or client-based products:
- Right-click the Trellix tray shield icon on the Windows taskbar.
- Select Open Console.
- In the console, select Action Menu.
- In the Action Menu, select Product Details. The product version displays.
Use the following instructions for server-based products:
- Check the version and build of ePO that is installed. For instructions, see KB52634 - How to determine what hotfix is installed for ePO 5.9.x.
- Create a query in ePO for the product version of the product installed within your organization.
Use the following instructions for Appliance-based products:
- Open the Administrator's User Interface (UI).
- Click the About link. The product version displays.
Use the following instructions:
- Log on to the ePO server.
- Click Menu, Data Protection, DLP Policy.
- Inside the DLP console click Help, About. The product version displays.
CVSS, or Common Vulnerability Scoring System, is the result of the National Infrastructure Advisory Council's effort to standardize a system of assessing the criticality of a vulnerability. This system offers an unbiased criticality score between 0 and 10 that customers can use to judge how critical a vulnerability is and plan accordingly. For more information, visit the CVSS website.
When calculating CVSS scores, we have adopted a philosophy that fosters consistency and repeatability. Our guiding principle for CVSS scoring is to score the exploit under consideration by itself. We consider only the immediate and direct impact of the exploit under consideration. We do not factor into a score any potential follow-on exploits that might be made possible by the successful exploitation of the issue being scored.
What are the CVSS scoring metrics?
- CVE-2024-0311: API Hooking in leading to Challenge/Response Bypass for Unlimited Time
Base Score 5.5 Attack Vector (AV) Local (L) Attack Complexity (AC) Low (L) Privileges Required (PR) Low (L) User Interaction (UI) None (N) Scope (S) Unchanged (U) Confidentiality (C) None (N) Integrity (I) High (H) Availability (A) None (N) Temporal Score (Overall) 5.0 Exploitability (E) Proof-of-Concept (P) Remediation Level (RL) Official Fix (O) Report Confidence (RC) Confirmed (C)
NOTE: The below CVSS version 3.1 vector was used to generate this score.
https://nvd.nist.gov/vuln-metrics/cvss/v3-calculator?vector=AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N/E:P/RL:O/RC:C&version=3.1
- CVE-2024-0312: API Hooking in leading to Uninstaller Challenge/Response Bypass
Base Score 5.5 Attack Vector (AV) Local (L) Attack Complexity (AC) Low (L) Privileges Required (PR) Low (L) User Interaction (UI) None (N) Scope (S) Unchanged (U) Confidentiality (C) None (N) Integrity (I) High (H) Availability (A) None (N) Temporal Score (Overall) 5.0 Exploitability (E) Proof-of-Concept (P) Remediation Level (RL) Official Fix (O) Report Confidence (RC) Confirmed (C)
NOTE: The below CVSS version 3.1 vector was used to generate this score.
https://nvd.nist.gov/vuln-metrics/cvss/v3-calculator?vector=AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N/E:P/RL:O/RC:C&version=3.1
- CVE-2024-0313: Unrestricted Client Proxy Policy Bypass via Release Code Enforcement Bypass
Base Score 5.5 Attack Vector (AV) Local (L) Attack Complexity (AC) Low (L) Privileges Required (PR) Low (L) User Interaction (UI) None (N) Scope (S) Unchanged (U) Confidentiality (C) None (N) Integrity (I) High (H) Availability (A) None (N) Temporal Score (Overall) 5.0 Exploitability (E) Proof-of-Concept (P) Remediation Level (RL) Official Fix (O) Report Confidence (RC) Confirmed (C)
NOTE: The below CVSS version 3.1 vector was used to generate this score.
https://nvd.nist.gov/vuln-metrics/cvss/v3-calculator?vector=AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N/E:P/RL:O/RC:C&version=3.1
Where can I find a list of all Security Bulletins?
All Security Bulletins are published in our security centre. Security Bulletins are retired (removed) once a product is both End of Sale and End of Support (End of Life).
How do I report a product vulnerability to Trellix or Skyhigh Security?
If you have information about a security issue or vulnerability with a Trellix or Skyhigh Security product, visit the PSIRT website for instructions at KB95563 - Report a vulnerability.
How does Trellix or Skyhigh Security respond to this and any other reported security flaws?
Our key priority is the security of our customers. If a vulnerability is found within any of our software or services, we work closely with the relevant security software development team to ensure the rapid and effective development of a fix and communication plan.
We only publish Security Bulletins if they include something actionable such as a workaround, mitigation, version update, or hotfix. Otherwise, we would simply be informing the hacker community that our products are a target, putting our customers at greater risk. For products that are updated automatically, a non-actionable Security Bulletin might be published to acknowledge the discoverer.
View our PSIRT policy on the Support website at KB95564 - About the Product Security Incident Response Team (PSIRT).
Resources
To contact Technical Support, log on to the ServicePortal and go to the Open New Case page.
Disclaimer
The information provided in this Security Bulletin is provided as is without warranty of any kind. Trellix/Skyhigh Security disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Trellix/Skyhigh Security or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Trellix/Skyhigh Security or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the preceding limitation may not apply.
Any future product release dates mentioned in this Security Bulletin are intended to outline our general product direction, and they should not be relied on in making a purchasing decision. The product release dates are for information purposes only, and may not be incorporated into any contract. The product release dates are not a commitment, promise, or legal obligation to deliver any material, code, or functionality. The development, release, and timing of any features or functionality described for our products remains at our sole discretion and may be changed or canceled at any time.
