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McAfee Security Bulletin: VirusScan Enterprise for Linux/LinuxShield update fixes multiple vulnerabilities (CVE-2016-8016, CVE-2016-8017, CVE-2016-8018, CVE-2016-8019, CVE-2016-8020, CVE-2016-8021, CVE-2016-8022, CVE-2016-8023, CVE-2016-8024, CVE-2016-8025)
Security Bulletins ID:   SB10181
Last Modified:  5/18/2017
Rated:


Summary

First Published: 12/9/2016
 
CVE Information
CVE Numbers Severity Rating CVSS v3 Base Score /
Temporal Scores
Impact of Vulnerability
CVE-2016-8023 High 8.1 / 7.1 Authentication Bypass by Assumed-Immutable Data (CWE-302 - http://cwe.mitre.org/data/definitions/302.html)
CVE-2016-8024 High 8.1 / 7.1 Improper Neutralization of CRLF Sequences in HTTP (CWE-113 - http://cwe.mitre.org/data/definitions/113.html)
CVE-2016-8020 High 8.0 / 7.0 Improper Control of Generation of Code (CWE-94 - http://cwe.mitre.org/data/definitions/94.html)
CVE-2016-8022 High 7.5 / 6.5 Authentication Bypass by Spoofing (CWE-290 - http://cwe.mitre.org/data/definitions/290.html)
CVE-2016-8025 Medium 6.2 / 5.4 Improper Neutralization of Special Elements used in an SQL Command (CWE-89 - http://cwe.mitre.org/data/definitions/89.html)
CVE-2016-8021 Medium 4.4 / 3.9 Improper Verification of Cryptographic Signature (CWE-347 - http://cwe.mitre.org/data/definitions/347.html)
CVE-2016-8018 Medium 4.3 / 3.8 Cross-Site Request Forgery (CWE-352 - http://cwe.mitre.org/data/definitions/352.html)
CVE-2016-8019 Medium 4.3 / 3.8 Cross-Site Scripting (CWE-79 - http://cwe.mitre.org/data/definitions/79.html)
CVE-2016-8016 Low 3.4 / 3.0 Information Exposure (CWE-200 - http://cwe.mitre.org/data/definitions/200.html)
CVE-2016-8017 Low 3.4 / 3.0 Failure to Sanitize Special Elements (CWE-75 - http://cwe.mitre.org/data/definitions/75.html)
 Recommendations:  Upgrade to Endpoint Security for Linux (ENSL) Threat Prevention 10.2 or later
 Security Bulletin Replacement:  None   
 Affected Software:  VirusScan Enterprise for Linux (VSEL) 2.0.3 and earlier
 Location of Updated Software:  http://www.mcafee.com/us/downloads/downloads.aspx

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Article contents:

Description

VSEL 2.0.3 (and earlier) is vulnerable to the following published security vulnerabilities. The ENSL 10.2 release resolves the following vulnerabilities. McAfee highly recommends that all customers upgrade from VSEL to ENSL.

Remediation

Go to the Product Downloads site and download the applicable product patch file:
 
Product Type Version File Name Release Date
Endpoint Security for Linux RTW 10.2.0 ISecTP-10.2.0-534-Release-standalone.tar.gz
ISecTP-10.2.0-534-Release-ePO.zip
September 8, 2016

Download and Installation Instructions
See KB56057 for instructions on how to download McAfee products, documentation, security updates, patches, and hotfixes. Review the Release Notes and the Installation Guide, which you can download from the Documentation tab, for instructions on how to install these updates.

Product Specific Notes

This issue does not apply to Management for Optimized Virtual Environments (MOVE) because the installation does not install the vulnerable Web UI for VSEL.

Workaround

Installing the provided product package specified in the Remediation table is strongly encouraged.

For ePolicy Orchestrator (ePO) managed systems, customers can disable the VSEL Web Interface using the following steps:
  1. Log into the ePO console.
  2. Open the policy catalog for VirusScan Enterprise for Linux 1.9.2/2.0.3.
  3. Open the General Policies policy that is currently assigned.
  4. Click the Advanced tab.
  5. Check the box next to Disable client Web UI.
  6. Click Save.
  7. Perform an Agent wakeup call to enforce the policy.
For unmanaged systems, customers can disable the VSEL Web Interface using the following steps:
  1. From a terminal session open the following file in a text editor:

    <runtimeDir>/etc/nailsd.cfg

    NOTE: The default location is /var/opt/NAI/LinuxShield/etc/nailsd.cfg.
     
  2. Locate the following entry

    nailsd.disableCltWEbUI: false
     
  3. Change the value to true.
  4. Save and close the file.
  5. Run the following command to restart the nails service:

    service nails restart or /etc/init.d/nails restart

Mitigations

McAfee recommends that VSEL administrators minimizes access to the Web UI and make sure to log off and close the browser after performing any configuration changes. Customers may also limit access to VSEL systems to trusted IP addresses only.

Acknowledgements

McAfee credits Andrew Fasano who reported these issues to CERT.

Frequently Asked Questions (FAQs)

What is CVSS?
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, please visit the CVSS website at: http://www.first.org/cvss/.

When calculating CVSS scores, McAfee has 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 successful exploitation of the issue being scored
 
What are the CVSS scoring metrics that have been used?
 
CVE-2016-8016: Information Exposure
 
 Base Score 3.4
 Attack Vector (AV) Network (N)
 Attack Complexity (AC) Low (L)
 Privileges Required (PR) High (H)
 User Interaction (UI) Required (R)
 Scope (S) Changed (C)
Confidentiality (C) Low (L)
Integrity (I) None (N)
Availability (A) None (N)
 Temporal Score (Overall) 3.0
 Exploitability (E) Unproven that Exploit Exists (U)
 Remediation Level (RL) Official Fix (OF)
 Report Confidence (RC) Confirmed (C)

NOTE: The below CVSS version 3.0 vector was used to generate this score.
https://nvd.nist.gov/cvss/v3-calculator?vector=AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:N/A:N/E:U/RL:O/RC:C
 
CVE-2016-8017: Failure to Sanitize Special Elements
 
 Base Score 3.4
 Attack Vector (AV) Network (N)
 Attack Complexity (AC) Low (L)
 Privileges Required (PR) High (H)
 User Interaction (UI) Required (R)
 Scope (S) Changed (C)
Confidentiality (C) Low (L)
Integrity (I) None (N)
Availability (A) None (N)
 Temporal Score (Overall) 3.0
 Exploitability (E) Unproven that Exploit Exists (U)
 Remediation Level (RL) Official Fix (OF)
 Report Confidence (RC) Confirmed (C)

NOTE: The below CVSS version 3.0 vector was used to generate this score.
https://nvd.nist.gov/cvss/v3-calculator?vector=AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:N/A:N/E:U/RL:O/RC:C
 
CVE-2016-8018: Cross-Site Request Forgery (CSRF)
 
 Base Score 4.3
 Attack Vector (AV) Network (N)
 Attack Complexity (AC) Low (L)
 Privileges Required (PR) High (H)
 User Interaction (UI) Required (R)
 Scope (S) Unchanged (U)
Confidentiality (C) Low (L)
Integrity (I) Low (L)
Availability (A) Low (L)
 Temporal Score (Overall) 3.8
 Exploitability (E) Unproven that Exploit Exists (U)
 Remediation Level (RL) Official Fix (OF)
 Report Confidence (RC) Confirmed (C)

NOTE: The below CVSS version 3.0 vector was used to generate this score.
https://nvd.nist.gov/cvss/v3-calculator?vector=AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:L/A:L/E:U/RL:O/RC:C
 
CVE-2016-8019: Cross-Site Scripting
 
 Base Score 4.3
 Attack Vector (AV) Network (N)
 Attack Complexity (AC) Low (L)
 Privileges Required (PR) High (H)
 User Interaction (UI) Required (R)
 Scope (S) Unchanged (U)
Confidentiality (C) Low (L)
Integrity (I) Low (L)
Availability (A) Low (L)
 Temporal Score (Overall) 3.8
 Exploitability (E) Unproven that Exploit Exists (U)
 Remediation Level (RL) Official Fix (OF)
 Report Confidence (RC) Confirmed (C)

NOTE: The below CVSS version 3.0 vector was used to generate this score.
https://nvd.nist.gov/cvss/v3-calculator?vector=AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:L/A:L/E:U/RL:O/RC:C
 
CVE-2016-8020:  Improper Control of Generation of Code
 
 Base Score 8.0
 Attack Vector (AV) Network (N)
 Attack Complexity (AC) High (H)
 Privileges Required (PR) High (H)
 User Interaction (UI) Required (R)
 Scope (S) Changed (C)
Confidentiality (C) High (H)
Integrity (I) High (H)
Availability (A) High (H)
 Temporal Score (Overall) 7.0
 Exploitability (E) Unproven that Exploit Exists (U)
 Remediation Level (RL) Official Fix (OF)
 Report Confidence (RC) Confirmed (C)

NOTE: The below CVSS version 3.0 vector was used to generate this score.
https://nvd.nist.gov/cvss/v3-calculator?vector=AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C
 
CVE-2016-8021: Improper Verification of Cryptographic Signature
 
 Base Score 4.4
 Attack Vector (AV) Network (N)
 Attack Complexity (AC) High (H)
 Privileges Required (PR) High (H)
 User Interaction (UI) Required (R)
 Scope (S) Unchanged (U)
Confidentiality (C) None(N)
Integrity (I) High (H)
Availability (A) None (N)
 Temporal Score (Overall) 3.9
 Exploitability (E) Unproven that Exploit Exists (U)
 Remediation Level (RL) Official Fix (OF)
 Report Confidence (RC) Confirmed (C)

NOTE: The below CVSS version 3.0 vector was used to generate this score.
https://nvd.nist.gov/cvss/v3-calculator?vector=AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C
 
CVE-2016-8022: Authentication Bypass by Spoofing
 
 Base Score 7.5
 Attack Vector (AV) Network (N)
 Attack Complexity (AC) High (H)
 Privileges Required (PR) None (N)
 User Interaction (UI) Required (R)
 Scope (S) Unchanged (C)
Confidentiality (C) High (H)
Integrity (I) High (H)
Availability (A) High (H)
 Temporal Score (Overall) 6.5
 Exploitability (E) Unproven that Exploit Exists (U)
 Remediation Level (RL) Official Fix (OF)
 Report Confidence (RC) Confirmed (C)

NOTE: The below CVSS version 3.0 vector was used to generate this score.
https://nvd.nist.gov/cvss/v3-calculator?vector=AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
 
CVE-2016-8023: Authentication Bypass by Assumed-Immutable Data
 
 Base Score 8.1
 Attack Vector (AV) Network (N)
 Attack Complexity (AC) High (H)
 Privileges Required (PR) None (N)
 User Interaction (UI) None (N)
 Scope (S) Unchanged (U)
Confidentiality (C) High (H)
Integrity (I) High (H)
Availability (A) High (H)
 Temporal Score (Overall) 7.1
 Exploitability (E) Unproven that Exploit Exists (U)
 Remediation Level (RL) Official Fix (OF)
 Report Confidence (RC) Confirmed (C)

NOTE: The below CVSS version 3.0 vector was used to generate this score.
https://nvd.nist.gov/cvss/v3-calculator?vector=AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
 
CVE-2016-8024: Improper Neutralization of CRLF Sequences in HTTP Headers
 
 Base Score 8.1
 Attack Vector (AV) Network (N)
 Attack Complexity (AC) High (H)
 Privileges Required (PR) None (N)
 User Interaction (UI) None (N)
 Scope (S) Unchanged (U)
Confidentiality (C) High (H)
Integrity (I) High (H)
Availability (A) High (H)
 Temporal Score (Overall) 7.1
 Exploitability (E) Unproven that Exploit Exists (U)
 Remediation Level (RL) Official Fix (OF)
 Report Confidence (RC) Confirmed (C)

NOTE: The below CVSS version 3.0 vector was used to generate this score.
https://nvd.nist.gov/cvss/v3-calculator?vector=AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
 
CVE-2016-8025: Improper Neutralization of Special Elements used in an SQL Command
 
 Base Score 6.2
 Attack Vector (AV) Network (N)
 Attack Complexity (AC) High (H)
 Privileges Required (PR) High (H)
 User Interaction (UI) None (N)
 Scope (S) Unchanged (U)
Confidentiality (C) High (H)
Integrity (I) High (H)
Availability (A) Low (L)
 Temporal Score (Overall) 5.4
 Exploitability (E) Unproven that Exploit Exists (U)
 Remediation Level (RL) Official Fix (OF)
 Report Confidence (RC) Confirmed (C)

NOTE: The below CVSS version 3.0 vector was used to generate this score.
https://nvd.nist.gov/cvss/v3-calculator?vector=AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:L/E:U/RL:O/RC:C

Where can I find a list of all security bulletins or how do I report a product vulnerability?
To find a list of all security bulletins, or if you have information about a security issue or vulnerability with a McAfee product, please visit our product security website at: http://www.mcafee.com/us/threat-center/product-security-bulletins.aspx.

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The information provided in this security bulletin is provided as is without warranty of any kind. McAfee disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall McAfee or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits, or special damages, even if McAfee 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 foregoing limitation may not apply.
 
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