Security Bulletin - Endpoint Security for Windows update fixes multiple vulnerabilities (CVE-2020-7250, CVE-2020-7255, CVE-2020-7257, CVE-2020-7259, CVE-2020-7261, CVE-2020-7273, CVE-2020-7274, CVE-2020-7275, CVE-2020-7276, CVE-2020-7277, CVE-2020-7278)
Security Bulletins ID:
SB10309
Last Modified: 5/4/2022
Last Modified: 5/4/2022
Summary
First Published: April 14, 2020
Article contents:
This Security Bulletin covers 11 vulnerabilities in ENS. The fixes for these vulnerabilities can be found in the following releases.
To remediate these issues, perform the following:
Download and Installation Instructions
For instructions to download product updates and hotfixes, see KB56057 - How to download Enterprise product updates and documentation. Review the Release Notes and Installation Guide for instructions on how to install these updates. All documentation is available at our Product Documentation site.
Acknowledgments
CVE-2020-7250 - We credit Jakub Palaczynski (ING Tech Poland) andEran Shimony (CyberArk) for independently reporting this flaw.
CVE-2020-7255 - We credit Lockheed Martin Red Team for reporting this flaw.
CVE-2020-7257 - We credit Jakub Palaczynski (ING Tech Poland) for reporting this flaw.
CVE-2020-7273 - We credit Dávid Müller for reporting this flaw.
CVE-2020-7274 - We credit Lockheed Martin Red Team for reporting this flaw.
CVE-2020-7278 - We credit EZ for reporting this flaw.
Frequently Asked Questions (FAQs)
How do I know if my product is vulnerable or not?
For Endpoint products:
Follow the instructions below for endpoint or client-based products:
Common Vulnerability Scoring System (CVSS) 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 determine how critical a vulnerability is and plan accordingly. For more information, visit the CVSS website.
When calculating CVSS scores, we adopt 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 don't 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?
All Security Bulletins are published on our Knowledge Center. 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 you?
If you have information about a security issue or vulnerability with a product, follow the instructions provided in KB95563 - Report a vulnerability.
How do you 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.
To view our PSIRT policy, see KB95564 - About PSIRT.
Resources
Disclaimer
The information provided in this Security Bulletin is provided as is without warranty of any kind. We disclaim all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall we or our suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits, or special damages, even if we or our suppliers have been advised of the possibility of such damages. Some states don't 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 shouldn't 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 aren't 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 remain at our sole discretion and may be changed or canceled at any time.
| CVE IDs | Impact of Vulnerabilities | Severity Ratings | CVSS v3.1 Base / Temporal Scores |
| CVE-2020-7250 | Improper Link Resolution Before File Access (CWE-59) | High | 8.2 / 7.4 |
| CVE-2020-7255 | Permissions, Privileges, and Access Control (CWE-264) | Low | 3.9 / 3.5 |
| CVE-2020-7257 | Permissions, Privileges, and Access Control (CWE-264) | High | 8.4 / 7.6 |
| CVE-2020-7259 | Permissions, Privileges, and Access Control (CWE-264) | Medium | 6.6 / 5.9 |
| CVE-2020-7261 | Failure to Constrain Operations within the Bounds of a Memory Buffer (CWE-119) | Medium | 6.1 / 5.5 |
| CVE-2020-7273 | Access Control (Authorization) Issues (CWE - 284) | Medium | 6.7 / 6.0 |
| CVE-2020-7274 | Improper Privilege Management (CWE-269) | Medium | 6.6 / 5.9 |
|
CVE-2020-7275
|
Unquoted Search Path or Element (CWE-428) | Medium | 4.8 / 4.3 |
| CVE-2020-7276 | Improper Authentication (CWE-287) | Medium | 6.4 / 5.8 |
| CVE-2020-7277 | Protection Mechanism Failure (CWE-693) | Medium | 6.8 / 6.1 |
| CVE-2020-7278 | Access Control (Authorization) Issues (CWE – 284) | High | 7.4 / 6.7 |
| Highest Severity Rating | High | ||
| Recommendations | Install or update to one of the following Endpoint Security (ENS) versions:
|
||
| Security Bulletin Replacement | None | ||
| Affected Software | ENS for Windows:
|
||
| Location of updated software | Product Downloads site | ||
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Article contents:
- Vulnerability Description
- Remediation
- Acknowledgments
- Frequently Asked Questions (FAQs)
- Resources
- Disclaimer
This Security Bulletin covers 11 vulnerabilities in ENS. The fixes for these vulnerabilities can be found in the following releases.
| 10.7.0 February 2020 Update |
10.6.1 February 2020 Update |
10.7.0 April 2020 Update |
10.6.1 April 2020 Update |
|
| CVE-2020-7250 | Fixed | Fixed | Fixed | Fixed |
| CVE-2020-7255 | Fixed | Fixed | Fixed | Fixed |
| CVE-2020-7257 | Fixed | Fixed | Fixed | Fixed |
| CVE-2020-7259 | Fixed | Fixed | Fixed | Fixed |
| CVE-2020-7261 | Fixed | Not vulnerable | Fixed | Not vulnerable |
| CVE-2020-7273 | Vulnerable, not fixed | Vulnerable, not fixed | Fixed | Fixed |
| CVE-2020-7274 | Vulnerable, not fixed | Vulnerable, not fixed | Fixed | Fixed |
| CVE-2020-7275 | Vulnerable, not fixed | Vulnerable, not fixed | Fixed | Fixed |
| CVE-2020-7276 | Vulnerable, not fixed | Not vulnerable | Fixed | Not vulnerable |
| CVE-2020-7277 | Vulnerable, not fixed | Vulnerable, not fixed | Fixed | Fixed |
| CVE-2020-7278 See KB92611 |
Vulnerable, not fixed | Vulnerable, not fixed | Fixed | Fixed |
- CVE-2020-7250 - ENS symbolic link log file manipulation vulnerability
Symbolic link manipulation vulnerability in ENS for Windows prior to 10.7.0 February 2020 Update allows an authenticated local user to potentially gain an escalation of privileges by pointing the link to files that the user wouldn't normally have permission to alter via carefully creating symbolic links from the ENS log file directory.
NVD CVE-2020-7250
MITRE CVE-2020-7250
- CVE-2020-7255 - Privilege Escalation vulnerability in ENS
Privilege escalation vulnerability in the administrative user interface in ENS for Windows prior to 10.7.0 February 2020 Update allows local users to gain elevated privileges via a configuration error.
NVD CVE-2020-7255
MITRE CVE-2020-7255
- CVE-2020-7257 - Privilege Escalation vulnerability through Symbolic links in ENS
Privilege escalation vulnerability in ENS for Windows prior to 10.7.0 February 2020 Update allows local users to cause deletion and creation of files that they wouldn't normally have permission to, through altering the target of symbolic links while an antivirus scan is in progress. This is timing-dependent.
NVD CVE-2020-7257
MITRE CVE-2020-7257
- CVE-2020-7259 - Unsigned executable vulnerability in ENS can be used to bypass intended self-protection rules
Exploitation of Privilege or Trust vulnerability in file in ENS prior to 10.7.0 February 2020 Update allows local users to bypass local security protection via a carefully crafted input file.
NVD CVE-2020-7259
MITRE CVE-2020-7259
- CVE-2020-7261 - Buffer overwrite in ENS allows to bypass AMSI protection
Buffer Overflow via Environment Variables vulnerability in AMSI component in ENS prior to 10.7.0 February 2020 Update allows local users to disable ENS via a carefully crafted user input.
NVD CVE-2020-7261
MITRE CVE-2020-7261
- CVE-2020-7273 - Autorun registry bypass
Accessing functionality not properly constrained by ACL vulnerability in the autorun start-up protection in ENS for Windows prior to 10.7.0 April 2020 Update allows local users to delete or rename programs in the autorun key via the manipulation of some parameters.
NVD CVE-2020-7273
MITRE CVE-2020-7273
- CVE-2020-7274 - ENS elevated permissions vulnerability
Privilege escalation vulnerability inMcTray.exe in ENS for Windows prior to 10.7.0 April 2020 Update allows local users to spawn unrelated processes with elevated privileges via the system administrator grantingMcTray.exe elevated privileges (by default, it runs with the current user's privileges).
NVD CVE-2020-7274
MITRE CVE-2020-7274
- CVE-2020-7275 - Unquoted service paths for some ENS files
The accessing, modifying, or executing executable files vulnerability in the uninstaller in ENS for Windows prior to 10.7.0 April 2020 Update allows local users to execute arbitrary code via a carefully crafted input file.
NVD CVE-2020-7275
MITRE CVE-2020-7275
- CVE-2020-7276 - Unrestricted Policy Management using MfeUpgradeTool.exe
Authentication bypass vulnerability in MfeUpgradeTool in Endpoint Security (ENS) for Windows prior to 10.7.0 April 2020 Update allows administrator users to access policy settings via running this tool.
NVD CVE-2020-7276
MITRE CVE-2020-7276
- CVE-2020-7277 - Processes not protected
Protection mechanism failure in all processes in ENS for Windows prior to 10.7.0 April 2020 Update allows local users to stop certain ENS processes, reducing the protection offered.
NVD CVE-2020-7277
MITRE CVE-2020-7277
- CVE-2020-7278 - Firewall rules not enforced correctly
Exploiting incorrectly configured access control security levels vulnerability in ENS Firewall in ENS for Windows prior to 10.7.0 April 2020 and 10.6.1 April 2020 updates allows remote attackers and local users to allow or block unauthorized traffic via pre-existing rules not being handled correctly when updating to the February 2020 updates.
NVD CVE-2020-7278
MITRE CVE-2020-7278
To remediate these issues, perform the following:
- ENS 10.7.x - Update to ENS 10.7.0 April 2020 Update.
- ENS 10.6.x - Upgrade to ENS 10.7.0 April 2020 Update, or update to ENS 10.6.1 April 2020 Update.
| Product | Version | Type | Release Date | Restart Needed |
| ENS for Windows | 10.7.0 April 2020 Update | Update | April 14, 2020 | Recommended |
| ENS for Windows | 10.6.1 April 2020 Update | Update | April 14, 2020 | Recommended |
Download and Installation Instructions
For instructions to download product updates and hotfixes, see KB56057 - How to download Enterprise product updates and documentation. Review the Release Notes and Installation Guide for instructions on how to install these updates. All documentation is available at our Product Documentation site.
Acknowledgments
CVE-2020-7250 - We credit Jakub Palaczynski (ING Tech Poland) and
CVE-2020-7255 - We credit Lockheed Martin Red Team for reporting this flaw.
CVE-2020-7257 - We credit Jakub Palaczynski (ING Tech Poland) for reporting this flaw.
CVE-2020-7273 - We credit Dávid Müller for reporting this flaw.
CVE-2020-7274 - We credit Lockheed Martin Red Team for reporting this flaw.
CVE-2020-7278 - We credit EZ for reporting this flaw.
Frequently Asked Questions (FAQs)
How do I know if my product is vulnerable or not?
For Endpoint products:
Follow the instructions below for endpoint or client-based products:
- Right-click on the 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.
Common Vulnerability Scoring System (CVSS) 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 determine how critical a vulnerability is and plan accordingly. For more information, visit the CVSS website.
When calculating CVSS scores, we adopt 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 don't 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-2020-7250 - ENS symbolic link log file manipulation vulnerability
Base Score 8.2 Attack Vector (AV) Local (L) Attack Complexity (AC) Low (L) Privileges Required (PR) Low (L) User Interaction (UI) Required (R) Scope (S) Changed (C) Confidentiality (C) High (H) Integrity (I) High (H) Availability (A) High (H) Temporal Score (Overall) 7.4 Exploitability (E) Proof-of-Concept (P) Remediation Level (RL) Official Fix (O) Report Confidence (RC) Confirmed (C)
NOTE: This CVSS version 3.1 vector is used to generate this score.
- CVE-2020-7255 - Privilege Escalation vulnerability in ENS allows folder creation in restricted locations
Base Score 3.9 Attack Vector (AV) Local (L) Attack Complexity (AC) High (H) Privileges Required (PR) Low (L) User Interaction (UI) Required (R) Scope (S) Changed (C) Confidentiality (C) None (N) Integrity (I) Low (L) Availability (A) Low (L) Temporal Score (Overall) 3.5 Exploitability (E) Proof-of-Concept (P) Remediation Level (RL) Official Fix (O) Report Confidence (RC) Confirmed (C)
NOTE: This CVSS version 3.1 vector is used to generate this score.
- CVE-2020-7257 - Privilege Escalation vulnerability through Symbolic links in ENS
Base Score 8.4 Attack Vector (AV) Local (L) Attack Complexity (AC) Low (L) Privileges Required (PR) Low (L) User Interaction (UI) None (N) Scope (S) Changed (C) Confidentiality (C) None (N) Integrity (I) High (H) Availability (A) High (H) Temporal Score (Overall) 7.6 Exploitability (E) Proof-of-Concept (P) Remediation Level (RL) Official Fix (O) Report Confidence (RC) Confirmed (C)
NOTE: This CVSS version 3.1 vector is used to generate this score.
- CVE-2020-7259 - Unsigned executable vulnerability in ENS can be used to bypass intended self-protection rules
Base Score 6.6 Attack Vector (AV) Local (L) Attack Complexity (AC) High (H) Privileges Required (PR) Low (L) User Interaction (UI) Required (R) Scope (S) Changed (C) Confidentiality (C) Low (L) Integrity (I) High (H) Availability (A) Low (L) Temporal Score (Overall) 5.9 Exploitability (E) Proof-of-Concept (P) Remediation Level (RL) Official Fix (O) Report Confidence (RC) Confirmed (C)
NOTE: This CVSS version 3.1 vector is used to generate this score.
- CVE-2020-7261 - Buffer overwrite in ENS allowed to bypass AMSI protection
Base Score 6.1 Attack Vector (AV) Local (L) Attack Complexity (AC) High (H) Privileges Required (PR) Low (L) User Interaction (UI) Required (R) Scope (S) Changed (C) Confidentiality (C) High (H) Integrity (I) Low (L) Availability (A) None (N) Temporal Score (Overall) 5.5 Exploitability (E) Proof-of-Concept (P) Remediation Level (RL) Official Fix (O) Report Confidence (RC) Confirmed (C)
NOTE: This CVSS version 3.1 vector is used to generate this score.
- CVE-2020-7273 - Autorun registry bypass
Base Score 6.7 Attack Vector (AV) Local (L) Attack Complexity (AC) Low (L) Privileges Required (PR) Low (L) User Interaction (UI) Required (R) Scope (S) Changed (C) Confidentiality (C) None (N) Integrity (I) Low (L) Availability (A) High (H) Temporal Score (Overall) 6.0 Exploitability (E) Proof-of-Concept (P) Remediation Level (RL) Official Fix (O) Report Confidence (RC) Confirmed (C)
NOTE: This CVSS version 3.1 vector is used to generate this score.
- CVE-2020-7274 - ENS elevated permissions vulnerability
Base Score 6.6 Attack Vector (AV) Local (L) Attack Complexity (AC) High (H) Privileges Required (PR) Low (L) User Interaction (UI) Required (R) Scope (S) Changed (C) Confidentiality (C) High (H) Integrity (I) Low (L) Availability (A) Low (L) Temporal Score (Overall) 5.9 Exploitability (E) Proof-of-Concept (P) Remediation Level (RL) Official Fix (O) Report Confidence (RC) Confirmed (C)
NOTE: This CVSS version 3.1 vector is used to generate this score.
- CVE-2020-7275 - Unquoted service paths for some ENS files
Base Score 4.8 Attack Vector (AV) Local (L) Attack Complexity (AC) Low (L) Privileges Required (PR) Low (L) User Interaction (UI) Required (R) Scope (S) Unchanged (U) Confidentiality (C) Low (L) Integrity (I) Low (L) Availability (A) Low (L) Temporal Score (Overall) 4.3 Exploitability (E) Proof-of-Concept (P) Remediation Level (RL) Official Fix (O) Report Confidence (RC) Confirmed (C)
NOTE: This CVSS version 3.1 vector is used to generate this score.
- CVE-2020-7276 - Unrestricted Policy Management using
MfeUpgradeTool.exe
Base Score 6.4 Attack Vector (AV) Local (L) Attack Complexity (AC) High (H) Privileges Required (PR) High (H) User Interaction (UI) Required (R) Scope (S) Changed (C) Confidentiality (C) Low (L) Integrity (I) High (H) Availability (A) Low (L) Temporal Score (Overall) 5.8 Exploitability (E) Proof-of-Concept (P) Remediation Level (RL) Official Fix (O) Report Confidence (RC) Confirmed (C)
NOTE: This CVSS version 3.1 vector is used to generate this score.
- CVE-2020-7277 - Processes not protected
Base Score 6.8 Attack Vector (AV) Local (L) Attack Complexity (AC) Low (L) Privileges Required (PR) None (N) User Interaction (UI) None (N) Scope (S) Changed (C) Confidentiality (C) Low (L) Integrity (I) Low (L) Availability (A) Low (L) Temporal Score (Overall) 6.1 Exploitability (E) Proof-of-Concept (P) Remediation Level (RL) Official Fix (O) Report Confidence (RC) Confirmed (C)
NOTE: This CVSS version 3.1 vector is used to generate this score.
- CVE-2020-7278 - Firewall rules not enforced correctly
Base Score 7.4 Attack Vector (AV) Network (N) Attack Complexity (AC) Low (L) Privileges Required (PR) Low (L) User Interaction (UI) None (N) Scope (S) Changed (C) Confidentiality (C) Low (L) Integrity (I) Low (L) Availability (A) Low (L) Temporal Score (Overall) 6.7 Exploitability (E) Proof-of-Concept (P) Remediation Level (RL) Official Fix (O) Report Confidence (RC) Confirmed (C)
NOTE: This CVSS version 3.1 vector is used to generate this score.
All Security Bulletins are published on our Knowledge Center. 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 you?
If you have information about a security issue or vulnerability with a product, follow the instructions provided in KB95563 - Report a vulnerability.
How do you 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.
To view our PSIRT policy, see KB95564 - About PSIRT.
Resources
To contact Technical Support, go to the Create a Service Request page and log on to the ServicePortal.
- If you are a registered user, type your User ID and Password, and then click Log In.
- If you are not a registered user, click Register and complete the fields to have your password and instructions emailed to you.
Disclaimer
The information provided in this Security Bulletin is provided as is without warranty of any kind. We disclaim all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall we or our suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits, or special damages, even if we or our suppliers have been advised of the possibility of such damages. Some states don't 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 shouldn't 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 aren't 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 remain at our sole discretion and may be changed or canceled at any time.
