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AUSCERT External Security Bulletin Redistribution
ESB-2019.1783
Multiple McAfee product updates fix OpenSSL vulnerability
17 May 2019
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: McAfee TIE Server
McAfee Web Gateway
McAfee DXL
McAfee Agent
Publisher: McAfee
Operating System: Windows
Linux variants
Mac OS
Impact/Access: Access Privileged Data -- Remote/Unauthenticated
Reduced Security -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2019-1559
Reference: ASB-2019.0128
ESB-2019.0895.2
ESB-2019.0649
ESB-2019.0620
Original Bulletin:
https://kc.mcafee.com/corporate/index?page=content&id=SB10282
- --------------------------BEGIN INCLUDED TEXT--------------------
McAfee Security Bulletin - Multiple McAfee product updates fix OpenSSL
vulnerabilities (CVE-2019-1559)
Security Bulletins ID : SB10282
Last Modified : 5/14/2019
Summary
First Published: May 14, 2019
+----------------------------+------------------------------------------------+
|Impact of Vulnerability: |Information Leak/Disclosure (CWE-717, OWASP |
| |2004:A6) |
+----------------------------+------------------------------------------------+
|CVE ID: |CVE-2019-1559 |
+----------------------------+------------------------------------------------+
|Severity Rating: |CVE-2019-1559: Medium |
| |PKCS#1 padding oracle: Medium |
+----------------------------+------------------------------------------------+
|CVSS v3 Base/Temporal |CVE-2019-1559: 5.9 |
|Scores: |PKCS#1 padding oracle: 5.9 |
+----------------------------+------------------------------------------------+
|Recommendations: |Deploy product updates as they are made |
| |available |
+----------------------------+------------------------------------------------+
|Security Bulletin |None |
|Replacement: | |
+----------------------------+------------------------------------------------+
| |Data Exchange Layer (DXL) 4.x, 5.x |
|Affected Software: |McAfee Agent 5.x |
| |Threat Intelligence Exchange (TIE) Server 2.x |
| |Web Gateway 7.x, 8.x |
+----------------------------+------------------------------------------------+
|Location of updated |http://www.mcafee.com/us/downloads/ |
|software: |downloads.aspx |
+----------------------------+------------------------------------------------+
Article contents:
o Vulnerability Description
o Remediation
o Product Specific Notes
o Acknowledgments
o Frequently Asked Questions (FAQs)
o Resources
o Disclaimer
Vulnerability Description
The main issue addressed in the OpenSSL 1.0.2r release relates to calling
SSL_shutdown() twice. None of the McAfee products explicitly make this sequence
of calls. We are updating our versions of OpenSSL for those products that may
be vulnerable.
1. CVE-2019-1559: 0-byte record padding oracle
If an application encounters a fatal protocol error and then calls
SSL_shutdown() twice (once to send a close_notify, and once to receive
one), OpenSSL can respond differently to the calling application if a 0
byte record is received with invalid padding compared to if a 0 byte record
is received with an invalid MAC. If the application then behaves
differently based on that in a way that is detectable to the remote peer,
this amounts to a padding oracle that could be used to decrypt data. For
this to be exploitable "non-stitched" ciphersuites must be in use. Stitched
ciphersuites are optimized implementations of certain commonly used
ciphersuites.
https://nvd.nist.gov/vuln/detail/CVE-2019-1559
2. PKCS#1 padding oracle
A Bleichenbacher type side-channel based padding oracle attack was found in
the way OpenSSL 1.0.2 before 1.0.2r, 1.1.0 before 1.1.0k, and 1.1.1 before
1.1.1b handles verification of RSA decrypted PKCS#1 v1.5 data. An attacker
could use this to extract plaintext or in some cases downgrade any TLS
connections to a vulnerable server.
OpenSSL did not publish a CVE for this issue, which is fixed in the same
release as CVE-2019-1559.
https://eyalro.net/project/cat/
https://github.com/openssl/openssl/issues/7739
Remediation
To remediate this issue, go to the Product Downloads site, and download the
applicable product update/hotfix file:
+-------+--------+----------+--------------------------------------+----------+
|Product|Versions|Type |File Name |Release |
| | | | |Date |
+-------+--------+----------+--------------------------------------+----------+
|TIE |2.x |Patch |openssl-1.0.2r-1.mlos2.x86_64.rpm |February |
|Server | | |openssl-libs-1.0.2r-1.mlos2.x86_64.rpm|28, 2019 |
+-------+--------+----------+--------------------------------------+----------+
|Web |7.7.2.21|Main |mwgappl-7.7.2.21.0-28544-x.86_64.iso |April 9, |
|Gateway| |Release | |2019 |
+-------+--------+----------+--------------------------------------+----------+
|Web |7.8.2.8 |Main |mwgappl-7.8.2.8.0-28536-x.86_64.iso |April 9, |
|Gateway| |Release | |2019 |
+-------+--------+----------+--------------------------------------+----------+
|Web |8.1.1 |Controlled|mwgappl-8.1.1-28538.x.86_64.iso |April 9, |
|Gateway| |Release | |2019 |
+-------+--------+----------+--------------------------------------+----------+
|DXL |5.0 |Hotfix |Data Exchange Layer 5.0.01 HF3 |May 7, |
| | | | |2019 |
+-------+--------+----------+--------------------------------------+----------+
|DXL |4.0 |Hotfix |Data Exchange Layer 4.0.0 HF9 |May 7, |
| | | | |2019 |
+-------+--------+----------+--------------------------------------+----------+
| | | |MA561WIN.zip | |
|McAfee |5..6.1 |Update |MA561LNX.zip |May 14, |
|Agent | | |MA561MAC.zip |2019 |
| | | |MA561WIN_EMBEDDED.zip | |
+-------+--------+----------+--------------------------------------+----------+
Download and Installation Instructions
See KB56057 for instructions on how to download McAfee products, documentation,
updates, 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
TIE Server: See KB90843 for instructions on how to update OpenSSL.
Acknowledgments
This vulnerability was first disclosed by The MITRE Corporation as a CVE.
Frequently Asked Questions (FAQs)
How do I know if 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 taskbar.
2. Select Open Console.
3. In the console, select Action Menu .
4. In the Action Menu, select Product Details . The product version displays.
For ePO:
Use the following instructions for ePO:
Check the version and build of ePO that is installed. For information about 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 displays.
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, 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 the
successful exploitation of the issue being scored.
What are the CVSS scoring metrics
1. CVE-2019-1559: 0-byte record padding oracle
+------------------------+-------------+
|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) |
+------------------------+-------------+
NOTE: The below CVSS version 3.0 vector was used to generate this score.
https://nvd.nist.gov/vuln-metrics/cvss/v3-calculatorname=CVE-2019-1559&
vector=AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
2. PKCS#1 padding oracle
+------------------------+-------------+
|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) |
+------------------------+-------------+
NOTE: The below CVSS version 3.0 vector was used to generate this score.
https://nvd.nist.gov/vuln-metrics/cvss/v3-calculatorvector=AV:N/AC:H/PR:N/
UI:N/S:U/C:H/I:N/A:N
- --------------------------END INCLUDED TEXT--------------------
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