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McAfee Security Bulletin - Email Gateway update fixes multiple OpenSSL vulnerabilities (CVE-2015-3193, CVE-2015-3194, CVE-2015-3195, CVE-2015-3196, and CVE-2015-3197)
Security Bulletins ID:   SB10203
Last Modified:  7/12/2017

Summary

First Published: 7/12/2017
 
 Impact of Vulnerability:  Multiple vulnerabilities within OpenSSL allow for a variety of different attacks against TLS
 CVE Numbers:  CVE-2015-3193
 CVE-2015-3194
 CVE-2015-3195
 CVE-2015-3196
 CVE-2015-3197
 Severity Rating:  CVE-2015-3193: High
 CVE-2015-3194: High
 CVE-2015-3195: Medium
 CVE-2015-3196: Medium
 CVE-2015-3197: Medium
 CVSS v3 Base / Temporal Scores:  CVE-2015-3193: 7.5 / 7.0
 CVE-2015-3194: 7.5 / 7.0
 CVE-2015-3195: 5.3 / 4.9
 CVE-2015-3196: 5.3 / 4.9
 CVE-2015-3197: 5.9 / 5.5
 Recommendations:  Install or update to Email Gateway (MEG) 7.6.404
 Security Bulletin Replacement:  None
 Affected Software:  MEG 7.6.4 and earlier
 Location of Updated Software:  http://www.mcafee.com/us/downloads/downloads.aspx

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Article contents:

Description

Multiple vulnerabilities within OpenSSL allow for a variety of different attacks against TLS.
  • CVE-2015-3193: BN_mod_exp may produce incorrect results on x86_64
    Implementation error in OpenSSL makes it easier for remote attackers to obtain sensitive private-key information via an attack against the Diffie-Hellman Diffie-Hellman Ephemeral ciphersuite.
    https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-3193
     
  • CVE-2015-3194: NULL pointer dereference in crypto/rsa/rsa_ameth.c
    Implementation error in OpenSSL allows remote attackers to cause a denial of service via an RSA PSS ASN.1 signature that lacks a mask generation function parameter.
    https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-3194
     
  • CVE-2015-3195: Malformed X509_ATTRIBUTE mishandled by crypto/asn1/tasn_dec.c
    Implementation error in OpenSSL mishandles errors caused by malformed X509_ATTRIBUTE data, which allows remote attackers to obtain sensitive information from process memory by triggering a decoding failure in a PKCS#7 or CMS application.
    https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-3195
     
  • CVE-2015-3196: Race condition and double free via a crafted ServerKeyExchange message
    Implementation error in OpenSSL allows remote servers to cause a denial of service via a crafted ServerKeyExchange message.
    https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-3196
     
  • CVE-2015-3197: ssl/s2_srvr.c does not prevent use of disabled ciphers
    OpenSSL does not prevent use of disabled ciphers, which makes it easier for man-in-the-middle attackers to defeat cryptographic protection mechanisms on SSLv2 traffic.
    https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-3197

Remediation

Update MEG to version 7.6.404.

Go to the Product Downloads site and download the applicable product patch file:
 
Product Type Version File Name Release Date
Email Gateway 7.6 4 -3328.101 Patch 7.6.404 MEG-7.6.404-3328.101.zip March 30, 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 available. McAfee strongly recommends that you install the provided patch.

Acknowledgements

These vulnerabilities were first disclosed by an OpenSSL Security Advisory published on December 3, 2015 and updated on December 4, 2015:
https://www.openssl.org/news/secadv/20151203.txt

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-2015-3193
 
 Base Score 7.5
 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) High (H)
 Integrity (I) None (N)
 Availability (A) None (N)
 Temporal Score (Overall) 7.0
 Exploitability (E) Functional (F)
 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://nvd.nist.gov/vuln-metrics/cvss/v3-calculator?vector=AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:F/RL:O/RC:C


CVE-2015-3194
 
 Base Score 7.5
 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) None (N)
 Integrity (I) None (N)
 Availability (A) High (H)
 Temporal Score (Overall) 7.0
 Exploitability (E) Functional (F)
 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://nvd.nist.gov/vuln-metrics/cvss/v3-calculator?vector=AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:F/RL:O/RC:C

CVE-2015-3195
 
 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) None (N)
 Integrity (I) None (N)
 Availability (A) Low (L)
 Temporal Score (Overall) 4.9
 Exploitability (E) Functional (F)
 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://nvd.nist.gov/vuln-metrics/cvss/v3-calculator?vector=AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:F/RL:O/RC:C

CVE-2015-3196
 
 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) None (N)
 Integrity (I) None (N)
 Availability (A) Low (L)
 Temporal Score (Overall) 4.9
 Exploitability (E) Functional (F)
 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://nvd.nist.gov/vuln-metrics/cvss/v3-calculator?vector=AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:F/RL:O/RC:C

CVE-2015-3197
 
 Base Score 5.9
 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) None (N)
 Availability (A) None (N)
 Temporal Score (Overall) 5.5
 Exploitability (E) Functional (F)
 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://nvd.nist.gov/vuln-metrics/cvss/v3-calculator?vector=AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N/E:F/RL:O/RC:C

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