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McAfee Security Bulletin - Web Gateway update fixes vulnerabilities CVE-2012-6706, CVE-2017-1000364, CVE-2017-1000366, and CVE-2017-1000368
Security Bulletins ID:   SB10205
Last Modified:  7/25/2017
Rated:


Summary

First Published: 7/25/2017
 
 Impact of Vulnerability:  CVE-2012-6706: VMSF_DELTA memory corruption
 CVE-2017-1000364: Linux kernel: Privilege escalation
 CVE-2017-1000366: glibc: Privilege escalation
 CVE-2017-1000368: SUDO: Privilege escalation
 CVE Numbers:  CVE-2012-6706
 CVE-2017-1000364
 CVE-2017-1000366
 CVE-2017-1000368
 Severity Rating:  CVE-2012-6706: Critical
 CVE-2017-1000364: High
 CVE-2017-1000366: High
 CVE-2017-1000368: High
 CVSS v3 Base / Temporal Scores:  CVE-2012-6706: 8.1 / 7.7
 CVE-2017-1000364: 7.4 / 7.1
 CVE-2017-1000366: 7.4 / 7.1
 CVE-2017-1000368: 7.8 / 7.5
 Recommendations:  Install or update to McAfee Web Gateway (MWG) 7.6.2.15 or later
 Install or update to MWG 7.7.2.3 or later
 Security Bulletin Replacement:  None
 Affected Software:  MWG 7.6.2.14 and earlier
 MWG 7.7.2.2 and earlier
 Location of Updated Software:  http://www.mcafee.com/us/downloads/downloads.aspx

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Article contents:

Description

MWG is affected by the following issues:
  • CVE-2012-6706:
    A VMSF_DELTA memory corruption was discovered in unrar before 5.5.5, as used in Sophos Anti-Virus Threat Detection Engine before 3.37.2 and other products, that can lead to arbitrary code execution. An integer overflow can be caused in DataSize+CurChannel. The result is a negative value of the "DestPos" variable, which allows the attacker to write out of bounds when setting Mem[DestPos].
    https://nvd.nist.gov/vuln/detail/CVE-2012-6706
     
  • CVE-2017-1000364:
    An issue was discovered in the size of the stack guard page on Linux, specifically a 4k stack guard page is not sufficiently large and can be "jumped" over (the stack guard page is bypassed). This affects Linux Kernel versions 4.11.5 and earlier (the stackguard page was introduced in 2010).
    https://nvd.nist.gov/vuln/detail/CVE-2017-1000364
     
  • CVE-2017-1000366:
    glibc contains a vulnerability that allows specially crafted LD_LIBRARY_PATH values to manipulate the heap/stack, causing them to alias, potentially resulting in arbitrary code execution. Please note that additional hardening changes have been made to glibc to prevent manipulation of stack and heap memory but these issues are not directly exploitable, as such they have not been given a CVE. This affects glibc 2.25 and earlier.
    https://nvd.nist.gov/vuln/detail/CVE-2017-1000366
     
  • CVE-2017-1000368:
    Todd Miller's sudo version 1.8.20p1 and earlier is vulnerable to an input validation (embedded newlines) in the get_process_ttyname() function resulting in information disclosure and command execution.
    https://nvd.nist.gov/vuln/detail/CVE-2017-1000368

Remediation

Go to the Product Downloads site and download the applicable product patch files:
 
Product Type Version Release Date
Web Gateway Maintenance Release 7.6.2.15 July 25, 2017
Web Gateway Feature Release 7.7.2.3 July 17, 2017

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

The following workarounds are available:
  • CVE-2017-1000364 and CVE-2017-1000366: Default installations that do not have a local shell user are not affected.
  • CVE-2017-1000368: Default installations that do not have a local shell user are not affected.
There is no workaround available for CVE-2012-6706. McAfee strongly recommends installing the provided releases specified in the Remediation table.

Acknowledgements

CVE-2012-6706 was disclosed by Google: https://bugs.chromium.org/p/project-zero/issues/detail?id=1286&desc=6.

CVE-2017-1000364 and CVE-2017-1000366 were disclosed by Qualys: https://www.qualys.com/2017/06/19/stack-clash/stack-clash.txt.

CVE-2017-1000368 was reported by Red Hat: https://access.redhat.com/security/cve/cve-2017-1000368.

Frequently Asked Questions (FAQs)

How do I know whether my McAfee product is vulnerable or not?
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.
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-2012-6706:
 
 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) 7.7
 Exploitability (E) Not Defined (X)
 Remediation Level (RL) Official Fix (O)
 Report Confidence (RC) Confirmed (C)

NOTE: The below CVSS version 3.0 vector was used to generate this score.

https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/RL:O/RC:C

CVE-2017-1000364:
 
 Base Score 7.4
 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) High (H)
 Integrity (I) High (H)
 Availability (A) High (H)
 Temporal Score (Overall) 7.1
 Exploitability (E) Not Defined (X)
 Remediation Level (RL) Official Fix (O)
 Report Confidence (RC) Confirmed (C)

NOTE: The below CVSS version 3.0 vector was used to generate this score.
https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/RL:O/RC:C

CVE-2017-1000366:
 
 Base Score 7.4
 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) High (H)
 Integrity (I) High (H)
 Availability (A) High (H)
 Temporal Score (Overall) 7.1
 Exploitability (E) Not Defined (X)
 Remediation Level (RL) Official Fix (O)
 Report Confidence (RC) Confirmed (C)

NOTE: The below CVSS version 3.0 vector was used to generate this score.
https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/RL:O/RC:C

CVE-2017-1000368:
 
 Base Score 7.8
 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) High (H)
 Integrity (I) High (H)
 Availability (A) High (H)
 Temporal Score (Overall) 7.5
 Exploitability (E) Not Defined (X)
 Remediation Level (RL) Official Fix (O)
 Report Confidence (RC) Confirmed (C)

NOTE: The below CVSS version 3.0 vector was used to generate this score.
https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/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.

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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