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[R7] Nessus 6.9 Fixes Multiple Vulnerabilities



Nessus is potentially impacted by several vulnerabilities in OpenSSL (20160926) 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. These vulnerabilities may impact Nessus and include:

  • CVE-2016-6308 - OpenSSL ssl/statem/statem_dtls.c dtls1_preprocess_fragment() Function DTLS Message Handling Memory Exhaustion Remote DoS
  • CVE-2016-6305 - OpenSSL ssl/record/rec_layer_s3.c SSL_peek() Function Empty Record Handling Remote DoS
  • CVE-2016-6304 - OpenSSL ssl/t1_lib.c ssl_parse_clienthello_tlsext() Function OCSP Status Request Extension Handling Memory Exhaustion Remote DoS
  • CVE-2016-6306 - OpenSSL Certificate Message Handling Limited Out-of-bounds Read DoS Weakness
  • CVE-2016-6307 - OpenSSL ssl/statem/statem_lib.c tls_get_message_header() Function Memory Exhaustion Remote DoS
  • CVE-2016-6303 - OpenSSL crypto/mdc2/mdc2dgst.c MDC2_Update() Function Buffer Overflow Weakness
  • CVE-2016-6329 - Triple Data Encryption Algorithm (3DES) 64-bit Block Size Birthday Attack HTTPS Cookie MitM Disclosure (SWEET32)
  • CVE-2016-6302 - OpenSSL ssl/t1_lib.c tls_decrypt_ticket() Function Ticket HMAC Digest Handling Remote DoS
  • CVE-2016-2179 - OpenSSL DTLS Buffered Message Saturation Queue Exhaustion Remote DoS
  • CVE-2016-2181 - OpenSSL DTLS Implementation Record Epoch Sequence Number Handling Remote DoS
  • CVE-2016-2182 - OpenSSL crypto/bn/bn_print.c BN_bn2dec() Function BIGNUM Handling Buffer Overflow DoS
  • CVE-2016-2180 - OpenSSL crypto/ts/ts_lib.c TS_OBJ_print_bio() Function Out-of-bounds Read Issue
  • CVE-2016-2178 - OpenSSL crypto/dsa/dsa_ossl.c DSA Signing Algorithm Constant Time Failure Side-channel Attack Information Disclosure
  • CVE-2016-2177 - OpenSSL Integer Overflow Unspecified Weakness
  • CVE-2016-6309 - OpenSSL ssl/statem/statem.c read_state_machine() Function Message Handling Use-after-free Remote Code Execution
  • CVE-2016-7052 - OpenSSL CRL Handling Unspecified NULL Pointer Dereference DoS

Additionally, Nessus and Tenable's managed Nessus Cloud offering were found to be impacted by an authenticated stored cross-site scripting (XSS) issue reported to us by Noriaki Iwasaki (CVE-2016-9260). Tenable thanks him for privately reporting the issue to us and giving us time to resolve the issue. Tenable would also like to thank JPCERT/CC for the coordination of their advisory on this issue.

Notes and caveats:

  1. Nessus Agents are not affected by these issues, as they do not act as an SSL server.
  2. The CVSSv2 score reflects CVE-2016-6302 and other remote DoS issues.
  3. Please note that Tenable strongly recommends that Nessus be installed on a subnet that is not Internet addressable.


Tenable has released Nessus version 6.9 that corresponds to the supported operating systems and architectures. This version bundles the updated OpenSSL library (1.0.2j), which is not affected, and addresses the XSS issue.

To update your Nessus installation, follow these steps:

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]

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