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[R7] OpenSSL '20150108' Advisory Affects Tenable Products

High
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Synopsis

Nessus, SecurityCenter, and the Tenable Appliance use OpenSSL, which recently disclosed several vulnerabilities.

  • OpenSSL contains a flaw in the dtls1_buffer_record() function that is triggered when handling a saturation of DTLS records that contain the same sequence number, but for the next epoch. This may allow a remote attacker to cause a memory leak and exhaust memory resources.
  • OpenSSL contains a NULL pointer dereference flaw in dtls1_get_record that is triggered when handling DTLS messages. This may allow a remote attacker to cause a segmentation fault.
  • OpenSSL contains a flaw that is due to it accepting DH certificates for client authentication when they are missing certificate verify messages. This may allow a remote attacker to authenticate without the use of a private key.
  • OpenSSL contains a flaw in bignum squaring (BN_sqr) that can cause incorrect results to be produced on certain platforms, including x86_64. This may allow attackers to have an unspecified impact.

Note that the associated CVSSv2 score represents the highest scored of the four issues. Further, Tenable strongly recommends that Nessus be installed on a subnet that is not Internet addressable.

Solution

Nessus Nessus 6.2 has been released to address the outlined issues in OpenSSL. SecurityCenter Tenable has released a patch for all supported versions of SecurityCenter that addresses this vulnerability. This patch applies OpenSSL 1.0.1l, which is not affected. The patch can be obtained from: https://support.tenable.com/support-center/index.php?x=&mod_id=160 
File                         md5sum        
SC-201502.1-rh5-32.tgz       0f74a1ec428cfc004433b7197f047f80
SC-201502.1-rh5-64.tgz       931db94496fc97f23683c5c1f81b3a32
SC-201502.1-rh6-32.tgz       5aa830cb73707a5a4fde03eea3f735a6
SC-201502.1-rh6-64.tgz       16078238a15789e3bc1006108fe81107
Tenable Appliance Tenable has released a patch to update the Tenable Appliance to remediate the OpenSSL issues listed above. The patch can be obtained from: https://support.tenable.com/support-center/index.php?x=&mod_id=230 
File                                  md5sum        
SC-TNS-2015-03_3.0.0-3.2.0.tar.gz     b6c5b943d1ce3173dd2485478963cf5b
In addition, Tenable has released version 3.3.1 of the Appliance on March 2, 2015, that addresses these issues.

Additional References

http://www.openssl.org/news/secadv_20150108.txt

This page contains information regarding security vulnerabilities that may impact Tenable's products. This may include issues specific to our software, or due to the use of third-party libraries within our software. Tenable strongly encourages users to ensure that they upgrade or apply relevant patches in a timely manner.

Tenable takes product security very seriously. If you believe you have found a vulnerability in one of our products, we ask that you please work with us to quickly resolve it in order to protect customers. Tenable believes in responding quickly to such reports, maintaining communication with researchers, and providing a solution in short order.

For more details on submitting vulnerability information, please see our Vulnerability Reporting Guidelines page.

If you have questions or corrections about this advisory, please email [email protected]

Risk Information

Tenable Advisory ID: TNS-2015-03
Risk Factor: High
CVSSv2 Base / Temporal Score
7.8 / 6.4
CVSSv2 Vector:
(AV:N/AC:L/Au:N/C:N/I:N/A:C/E:F/RL:OF/RC:C)
Additional Keywords:
IAVM 2015-A-0005

Affected Products

SecurityCenter: 4.6.2.2, 4.7.0, 4.7.1, 4.8.0, 4.8.1, 4.8.2
Tenable Appliance: 2.x.x, 3.0.0, 3.1.0, 3.2.0
Nessus: 6.0, 6.1

Disclosure Timeline

2015-01-08 - OpenSSL Solution Available
2015-02-04 - Tenable Solution Available

Advisory Timeline

2015-02-03 - [R1] Initial release
2015-02-04 - [R2] Update affected products
2015-03-02 - [R3] Appliance upgrade available
2015-03-11 - [R4] Add Nessus affected / fixed info
2016-03-03 - [R5] Title standardization
2016-11-17 - [R6] Adjusted CVSSv2 score
2017-02-28 - [R7] Adjust CVSS for worst-case scenario (AV:A -> AV:N)
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