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AUSCERT External Security Bulletin Redistribution
ESB-2017.1743
2017-07 Security Bulletin: OpenSSL Security Advisory
13 July 2017
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AusCERT Security Bulletin Summary
---------------------------------
Product: Juniper Junos OS
Juniper CTPOS
Juniper CTPView
Publisher: Juniper Networks
Operating System: Juniper
Impact/Access: Access Privileged Data -- Remote/Unauthenticated
Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2017-3732 CVE-2017-3731 CVE-2016-7055
Reference: ESB-2017.1663
Original Bulletin:
https://kb.juniper.net/InfoCenter/index?page=content&id=JSA10775
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2017-07 Security Bulletin: OpenSSL Security Advisory [26 Jan 2017]
PRODUCT AFFECTED:
This issue affects Junos OS 14.1, 14.1X53, 14.2, 15.1, 15.1X49, 15.1X53,
15.1X56, 16.1, 16.2, 17.1. This issue affects CTPOS 7.0, 7.1, 7.2, 7.3. This
issue affects CTPView 7.1, 7.2, 7.3.
PROBLEM:
The OpenSSL project has published a security advisory for vulnerabilities
resolved in the OpenSSL library on January 26, 2017. The following is a
summary of these vulnerabilities and their status with respect to Juniper
products:
CVE CVSSv3 Base Score Summary
CVE-2017-3731 5.3 (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L)
If an SSL/TLS server or client is running on a 32-bit host, and a specific
cipher is being used, then a truncated packet can cause that server or client
to perform an out-of-bounds read, usually resulting in a crash.
CVE-2017-3732 3.7 (CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N)
There is a carry propagating bug in the x86_64 Montgomery squaring procedure.
No EC algorithms are affected. Analysis suggests that attacks against RSA and
DSA as a result of this defect would be very difficult to perform and are not
believed likely.
CVE-2016-7055 3.7 (CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L)
There is a carry propagating bug in the Broadwell-specific Montgomery
multiplication procedure that handles input lengths divisible by, but longer
than 256 bits. Analysis suggests that attacks against RSA, DSA and DH private
keys are impossible. This is because the subroutine in question is not used in
operations with the private key itself and an input of the attacker's direct
choice. Otherwise the bug can manifest itself as transient authentication and
key negotiation failures or reproducible erroneous outcome of public-key
operations with specially crafted input. Among EC algorithms only Brainpool
P-512 curves are affected and one presumably can attack ECDH key negotiation.
Affected Products
Junos OS, CTPView, and CTPOS are potentially affected by one or more of these
issues.
Juniper Secure Analytics (JSA, STRM) and ScreenOS are confirmed to not be
vulnerable to any of these issues.
This advisory will be updated as additional products are analyzed and fixes
become available.
SOLUTION:
Junos OS:
The following software releases have been updated to OpenSSL 1.0.2k to resolve
these specific issues: 14.1R8-S3, 14.1R9, 14.1X53-D43, 14.1X53-D50, 14.2R4-S7,
14.2R7-S6, 14.2R8, 15.1F5-S7, 15.1F6-S6, 15.1R5-S2, 15.1R6, 15.1X49-D100,
15.1X53-D230, 15.1X53-D47, 15.1X53-D57, 15.1X53-D63, 15.1X53-D70, 15.1X56-D62,
16.1R3-S3, 16.1R4-S1, 16.1R5, 16.2R1-S3, 16.2R2, 17.1R2, 17.2R1, and all
subsequent releases.
CTPOS:
The following software releases have been updated to OpenSSL 1.0.2k to resolve
these specific issues: 7.0R7, 7.1R3, 7.2R2, 7.3R2, 7.4R1, and all subsequent
releases.
CTPView:
The following software releases have been updated to OpenSSL 1.0.2k to resolve
these specific issues: 7.1R4, 7.2R2, 7.3R3, 7.4R1, and all subsequent
releases.
These issues are being tracked as PRs 1249517 (Junos OS), 1249823 (CTP), and
1249814 (CTPView), and are visible on the Customer Support website.
KB16765 - "In which releases are vulnerabilities fixed?" describes which
release vulnerabilities are fixed as per our End of Engineering and End of
Life support policies.
WORKAROUND:
Standard security best current practices (control plane firewall filters, edge
filtering, access lists, etc.) may protect against any remote malicious
attacks.
Junos OS:
Since SSL is used for remote network configuration and management applications
such as J-Web and SSL Service for JUNOScript (XNM-SSL), viable workarounds for
this issue in Junos may include:
Disabling J-Web
Disable SSL service for JUNOScript and only use Netconf, which makes use of
SSH, to make configuration changes
Limit access to J-Web and XNM-SSL from only trusted networks
General Mitigation (CTP, CTPView)
It is good security practice to limit the exploitable attack surface of
critical infrastructure networking equipment. Use access lists or firewall
filters to limit access to the HTTPS or SSL/TLS services only from trusted,
administrative networks or hosts.
IMPLEMENTATION:
How to obtain fixed software:
Security vulnerabilities in Junos are fixed in the next available Maintenance
Release of each supported Junos version. In some cases, a Maintenance Release
is not planned to be available in an appropriate time-frame. For these cases,
Service Releases are made available in order to be more timely. Security
Advisory and Security Notices will indicate which Maintenance and Service
Releases contain fixes for the issues described. Upon request to JTAC,
customers will be provided download instructions for a Service Release.
Although Juniper does not provide formal Release Note documentation for a
Service Release, a list of "PRs fixed" can be provided on request.
MODIFICATION HISTORY:
2017-07-12: Initial publication
RELATED LINKS:
KB16613: Overview of the Juniper Networks SIRT Quarterly Security Bulletin
Publication Process
KB16765: In which releases are vulnerabilities fixed?
KB16446: Common Vulnerability Scoring System (CVSS) and Juniper's Security
Advisories
Report a Vulnerability - How to Contact the Juniper Networks Security Incident
Response Team
OpenSSL Security Advisory [26 Jan 2017]
CVSS SCORE:
5.3 (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L)
RISK LEVEL:
Medium
RISK ASSESSMENT:
Information for how Juniper Networks uses CVSS can be found at KB 16446
"Common Vulnerability Scoring System (CVSS) and Juniper's Security
Advisories."
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