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McAfee Security Bulletin: McAfee Web Gateway update fixes multiple vulnerabilities
Security Bulletins ID:   SB10156
Last Modified:  4/6/2017

Summary

First Published: 02/25/2016
 
 Impact of Vulnerability:  Cryptographic Issue (CWE-310)
 Denial of Service (CWE-730, OWASP 2004:A9)
 Directory Traversal (CWE-22)
 Permissions, Privileges, and Access Control (CWE-264)
 CVE Numbers:  CVE-2015-5345
 CVE-2016-0787
 CVE-2016-0705,
 CVE-2016-0797
 CVE-2016-0702
 Severity Rating:  Medium
 Base / Overall CVSS v3 Scores:  CVE-2015-5345, 5.3 / 4.9
 CVE-2016-0787, 4.8 / 4.0
 CVE-2016-0705, 3.7 / 3.4
 CVE-2016-0797, 3.7 / 3.4
 CVE-2016-0702, 4.0 / 3.7 not exploitable because no local users exist on appliance
 Recommendations:  Install or update to 7.5.2.7 or 7.6.1.2
 Security Bulletin Replacement:  None
 Affected Software:  McAfee Web Gateway (MWG) 7.5.2.6 and earlier, 7.6.1.1 and earlier
 Location of Updated Software:  http://www.mcafee.com/us/downloads/downloads.aspx

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Article contents:

Description

CVE-2015-5345 - Information disclosure.
 Attackers that have access to the GUI Admin Console could list file system entities of the MWG appliance.
 
CVE-2016-0787 - Weak/By-pass of encryption.
Session parameters of SSH handshake are less secure than should be. Attackers could theoretically guess those parameters, which could render the encryption useless.
CVE-2016-0705 - DOS via double free/memory corruption.
Attackers could theoretically crash MWGs scanning component and hence disrupt its service temporarily but repeatable.
CVE-2016-0797 - DOS and potentially other impacts via memory corruption and integer overflow.
Attackers could theoretically crash MWGs scanning component and hence disrupt its service temporarily but repeatable. Potentially there are other unspecified side effects.
CVE-2016-0702 - Information disclosure via by reading other processes processor cache lines.
Not exploitable because there are no local users on an MWG appliance.
 

Remediation

Go to the Product Downloads site and download the applicable product patch/hotfix files:
 
Product Type Version File Name Release Date
MWG 7.5.2.7 Maintenance
Release
7.5.2.7 n/a April 6, 2016
MWG 7.6.1.2 Maintenance
Release
7.6.1.2 n/a April 6, 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.

Workaround

None. Install the latest Maintenance Release.

Mitigations

No vulnerability detection signatures are available.

Acknowledgements

Frequently Asked Questions (FAQs)

How do I know whether my McAfee product is vulnerable or not?

For Endpoint products:
Use the following instructions for endpoint or client based products:
  1. Right-click on the McAfee tray shield icon on the Windows task bar.
  2. Select Open Console.
  3. In the console, select Action Menu.
  4. In the Action Menu, select Product Details. The product version is displayed.
For ePO:
Check the version and build of ePO that is installed. For information on how to check the version, see KB52634.

For Appliances:
Use the following instructions for Appliance based products:
  1. Open the Administrator's User Interface (UI).
  2. Click the About link. The product version is displayed.
For DLPe ePO Extension:
Use the following instructions:
  1. Log on to ePO server.
  2. Click Menu, Data Protection, DLP Policy.
  3. Inside the DLP console click the Help menu item, About. The product version is displayed.
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 v2 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.

CVSS v3 scoring is in final review as of December 2015. CVSS v2 will be replaced with CVSS v3 when v3 is fully approved. Security bulletins will have scores for both versions for at least 6 months after v3 is fully approved.
https://www.first.org/cvss/v3/development
https://www.first.org/cvss/calculator/3.0
 
What are the CVSS scoring metrics that have been used?
 
CVE-2015-5345
 

CVSS v3 Scoring:
 
 Base Score 5.3
 Attack Vector (AV) Network (N)
 Attack Complexity (AC) Low (L)
 Privileges Required (PR) None (N)
 User Interaction (UI) None (N)
 Scope (S) Unchanged (U)
Confidentiality (C) Low (L)
Integrity (I) None (N)
Availability (A) None (N)
 Temporal Score (Overall) 4.9
 Exploitability (E) Not Defined (X)
 Remediation Level (RL) Official Fix (O)
 Report Confidence (RC) Reasonable (R)

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:N/UI:N/S:U/C:L/I:N/A:N/E:X/RL:O/RC:R
 


CVE-2016-0787
 

CVSS v3 Scoring:
 
 Base Score 4.8
 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) Low (L)
Integrity (I) Low (L)
Availability (A) None (N)
 Temporal Score (Overall) 4.0
 Exploitability (E) Unproven(U)
 Remediation Level (RL) Official Fix (O)
 Report Confidence (RC) Reasonable (R)

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:L/I:L/A:N/E:U/RL:O/RC:R
 


CVE-2016-0705
 

CVSS v3 Scoring:
 
 Base Score 3.7
 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) None (N)
Integrity (I) Low (L)
Availability (A) Low (L)
 Temporal Score (Overall) 3.4
 Exploitability (E) Not Defined (X)
 Remediation Level (RL) Official Fix (O)
 Report Confidence (RC) Reasonable (R)

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:N/I:N/A:L/E:X/RL:O/RC:R
 


CVE-2016-0797
 

CVSS v3 Scoring:
 
 Base Score 3.7
 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) Low (L)
Integrity (I) Low (L)
Availability (A) None (N)
 Temporal Score (Overall) 3.4
 Exploitability (E) Not Defined (X)
 Remediation Level (RL) Official Fix (O)
 Report Confidence (RC) Reasonable (R)

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:N/I:N/A:L/E:X/RL:O/RC:R
 


CVE-2016-0702
 

CVSS v3 Scoring:
 
 Base Score 4.0
 Attack Vector (AV) Local (L)
 Attack Complexity (AC) High (H)
 Privileges Required (PR) None (N)
 User Interaction (UI) None (N)
 Scope (S) Unchanged (U)
Confidentiality (C) Low (L)
Integrity (I) Low (L)
Availability (A) None (N)
 Temporal Score (Overall) 3.7
 Exploitability (E) Not Defined (X)
 Remediation Level (RL) Official Fix (O)
 Report Confidence (RC) Reasonable (R)

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


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.

Resources

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Disclaimer

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.
 
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 cancelled at any time.

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