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AUSCERT Security Bulletin
ASB-2018.0013
Multiple vulnerabilities have been identified in Tenable SecurityCenter
17 January 2018
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AusCERT Security Bulletin Summary
---------------------------------
Product: Tenable SecurityCenter
Operating System: Linux variants
Network Appliance
Virtualisation
Impact/Access: Access Privileged Data -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2017-3738 CVE-2017-3737
Member content until: Friday, February 16 2018
Reference: ESB-2017.3217
ESB-2017.3209
ESB-2017.3169
ESB-2017.3144.2
OVERVIEW
Multiple vulnerabilities have been identified in Tenable
SecurityCenter prior to version 5.6.1. [1]
IMPACT
The vendor has provided the following details regarding the
vulnerabilities:
"OpenSSL security-bypass vulnerability (CVE-2017-3737)": [1]
"OpenSSL 1.0.2 (starting from version 1.0.2b) introduced an "error
state" mechanism. The intent was that if a fatal error occurred
during a handshake then OpenSSL would move into the error state and
would immediately fail if you attempted to continue the handshake.
This works as designed for the explicit handshake functions
(SSL_do_handshake(), SSL_accept() and SSL_connect()), however due to
a bug it does not work correctly if SSL_read() or SSL_write() is
called directly. In that scenario, if the handshake fails then a
fatal error will be returned in the initial function call. If
SSL_read()/SSL_write() is subsequently called by the application for
the same SSL object then it will succeed and the data is passed
without being decrypted/encrypted directly from the SSL/TLS record
layer. In order to exploit this issue an application bug would have
to be present that resulted in a call to SSL_read()/SSL_write()
being issued after having already received a fatal error. OpenSSL
version 1.0.2b-1.0.2m are affected. Fixed in OpenSSL 1.0.2n. OpenSSL
1.1.0 is not affected." [2]
"OpenSSL information-disclosure vulnerability (CVE-2017-3738)": [1]
"There is an overflow bug in the AVX2 Montgomery multiplication
procedure used in exponentiation with 1024-bit moduli. 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. Attacks against DH1024 are
considered just feasible, because most of the work necessary to
deduce information about a private key may be performed offline. The
amount of resources required for such an attack would be
significant. However, for an attack on TLS to be meaningful, the
server would have to share the DH1024 private key among multiple
clients, which is no longer an option since CVE-2016-0701. This only
affects processors that support the AVX2 but not ADX extensions like
Intel Haswell (4th generation). Note: The impact from this issue is
similar to CVE-2017-3736, CVE-2017-3732 and CVE-2015-3193. OpenSSL
version 1.0.2-1.0.2m and 1.1.0-1.1.0g are affected. Fixed in OpenSSL
1.0.2n. Due to the low severity of this issue we are not issuing a
new release of OpenSSL 1.1.0 at this time. The fix will be included
in OpenSSL 1.1.0h when it becomes available. The fix is also
available in commit e502cc86d in the OpenSSL git repository." [3]
MITIGATION
Tenable advises users to upgrade to the latest version.
Tenable also advises a patch to only upgrade OpenSSL has been made
available for SecurityCenter versions 5.4.x, 5.5.x, and 5.6.0.x. [1]
REFERENCES
[1] [R2] SecurityCenter 5.6.1 Fixes Multiple Third-party
Vulnerabilities
https://www.tenable.com/security/tns-2017-16
[2] CVE-2017-3737 Detail
https://nvd.nist.gov/vuln/detail/CVE-2017-3737
[3] CVE-2017-3738 Detail
https://nvd.nist.gov/vuln/detail/CVE-2017-3738
AusCERT has made every effort to ensure that the information contained
in this document is accurate. However, the decision to use the information
described is the responsibility of each user or organisation. The decision to
follow or act on information or advice contained in this security bulletin is
the responsibility of each user or organisation, and should be considered in
accordance with your organisation's site policies and procedures. AusCERT
takes no responsibility for consequences which may arise from following or
acting on information or advice contained in this security bulletin.
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Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072
Internet Email: auscert@auscert.org.au
Facsimile: (07) 3365 7031
Telephone: (07) 3365 4417 (International: +61 7 3365 4417)
AusCERT personnel answer during Queensland business hours
which are GMT+10:00 (AEST).
On call after hours for member emergencies only.
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