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[R5] OpenSSL '20160503' Advisory Affects Tenable Products

Critical
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Synopsis

Nessus and SecurityCenter are potentially impacted by several vulnerabilities in OpenSSL that were recently disclosed and fixed. Note that due to the time involved in doing a full analysis of each issue, Tenable has opted to upgrade the included version of OpenSSL as a precaution, and to save time. The issues include:

  • CVE-2016-2107 - OpenSSL AES-NI CBC MAC Check Padding Oracle MitM Information Disclosure
  • CVE-2016-2105 - OpenSSL crypto/evp/encode.c EVP_EncodeUpdate() Function Heap Buffer Overflow Weakness
  • CVE-2016-2106 - OpenSSL crypto/evp/evp_enc.c EVP_EncryptUpdate() Function Heap Buffer Overflow Weakness
  • CVE-2016-2176 - OpenSSL crypto/x509/x509_obj.c X509_NAME_oneline() Function ASN1 Strings Handling Out-of-bounds Read Memory Disclosure
  • CVE-2016-2109 - OpenSSL crypto/asn1/a_d2i_fp.c ASN.1 BIO Length Field Handling Memory Exhaustion Remote DoS

Notes and caveats:

  • Nessus Agents are not affected by these issues, as they do not act as an SSL server.
  • The CVSS score reflects CVE-2016-2108.
  • Please note that Tenable strongly recommends products be installed on a subnet that is not Internet addressable.

Solution

Nessus:

Tenable has released version 6.7 that corresponds to the supported operating systems and architectures. This version bundles the updated OpenSSL library (1.0.2h), which is not affected. Version 6.7 of Nessus bundles OpenSSL 1.0.2h.

To update your Nessus installation, follow these steps:

SecurityCenter:

Tenable has released version 5.3.2 of SecurityCenter that addresses these vulnerabilities. This version includes OpenSSL 1.0.1t, which is not affected. Upgrade information can be obtained from:

http://static.tenable.com/prod_docs/upgrade_security_center.html

A patch for SecurityCenter versions 5.3.1, 5.2.0, 5.1.0, and 5.0.2 has been made available that upgrades OpenSSL to 1.0.1t and can be obtained from

https://support.tenable.com/support-center/index.php?x=&mod_id=160

File	   		      md5sum
SC-201605.1-5.x-rh5-64.tgz 73873bdb97bf6ef60ca782edbed69955
SC-201605.1-5.x-rh6-64.tgz 40e87a74064bf7468c97d5ddbb62a1a1
SC-201605.1-5.x-rh7-64.tgz a23c0c6aa27cba0615d67d3a716a852f

A patch that upgrades OpenSSL to 1.0.1t for SecurityCenter 4.8.x is also available:

File	   		      md5sum
SC-201605.1-4.8.2-rh5-32.tgz be260588964630a80b0e74af9941e2f8
SC-201605.1-4.8.2-rh5-64.tgz 77fb7426a7f5fff4a16c090f32458f06
SC-201605.1-4.8.2-rh6-32.tgz c9376ecdfd4b3f7b6baf90f696323a48
SC-201605.1-4.8.2-rh6-64.tgz 5c14a21e50ef6393ebc2009a49b5479f

Additional References

https://www.openssl.org/news/secadv/20160503.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-2016-10
Risk Factor: Critical
CVSSv2 Base / Temporal Score
10.0 / 7.4
CVSSv2 Vector:
(AV:N/AC:L/Au:N/C:C/I:C/A:C/E:U/RL:OF/RC:C)

Affected Products

Nessus 6.6.2
SecurityCenter 4.8.0, 4.8.1, 4.8.2, 5.0.2, 5.1.0, 5.2.0, 5.3.1

Disclosure Timeline

2016-05-03 - OpenSSL 1.0.2h / 1.0.1t released
2016-05-06 - SecurityCenter 5.3.2 and patches released

Advisory Timeline

2016-05-19 - [R1] Initial Release
2016-06-09 - [R2] SecurityCenter details added
2016-06-10 - [R3] Updated affected versions, fixed typo. Oops!
2016-06-11 - [R4] Adjusted CVSSv2 score
2017-02-28 - [R5] Adjust CVSS for worst-case scenario (AV:A -> AV:N)
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