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[R5] SecurityCenter 5.2.0 Affected by Third-party Library Vulnerabilities

Medium

Synopsis

PHP bundles the Perl-Compatible Regular Expressions (PCRE) library for RegExp parsing, which SecurityCenter implements. PHP 5.6.18 was released that fixes a variety of issues in the bundled PCRE library, that includes:

  • CVE-2015-8383 - PCRE RegExp Repeated Conditional Group Handling Buffer Overflow DoS
  • CVE-2015-8386 - PCRE lookbehind Assertion Mutual Recursion Handling Stack Overflow DoS
  • CVE-2015-8387 - PCRE RegExp Subroutine Call Handling Integer Overflow DoS
  • CVE-2015-8389 - PCRE RegExp Pattern Handling Infinite Recursion DoS
  • CVE-2015-8390 - PCRE RegExp Character Class Substring Handling Uninitialized Memory Read DoS
  • CVE-2015-8393 - PCRE pcregrep Binary File -q Option Handling Information Disclosure
  • CVE-2015-8394 - PCRE RegExp digits Conditions Handling Integer Overflow DoS
  • CVE-2015-8391 - PCRE pcre_compile.c pcre_compile() Function RegExp Nesting Handling CPU Consumption DoS

Due to the amount of time required to follow user input tracing to determine if these issues actually affect SecurityCenter, Tenable opted to upgrade PHP instead, as a precautionary measure. Note that the CVSS score in this advisory reflects the highest risk of the issues included, as it may potentially impact SecurityCenter.

Please note that Tenable strongly recommends that SecurityCenter be installed on a subnet that is not Internet addressable.

Solution

Tenable has released a patch for all supported versions of SecurityCenter that addresses this vulnerability. This patch applies PHP 5.6.18, which bundles PCRE 8.38, which is not affected. This patch has been tested on SecurityCenter versions 5.0.2, 5.1.0, and 5.2.0. Further, when released, version 5.3.0 will include PHP 5.6.18.

The patch can be obtained from:

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

File	   		      md5sum
SC-201603.1-5.x-rh5-64.tgz	e4beebfb83b9b7928b6b61687d1129e4
SC-201603.1-5.x-rh6-64.tgz	eb983017056435d43d0ca4dc75b71010

Additional References

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-2016-04
Risk Factor: Medium
CVSSv2 Base / Temporal Score
4.0 / 3.0
CVSSv2 Vector:
(AV:N/AC:L/Au:S/C:N/I:N/A:P/E:U/RL:OF/RC:C)
Additional Keywords:
IAVM 2016-B-0025

Affected Products

SecurityCenter: 5.0.2, 5.1.0, 5.2.0

Disclosure Timeline

2016-02-11 - ACAS notifies Tenable of potential PHP/PCRE issues
2016-03-08 - Tenable releases patches for SC

Advisory Timeline

2016-03-08 - [R1] Initial Release
2016-03-10 - [R2] Added CVE-2015-8383
2016-11-12 - [R3] Adjusted CVSSv2 scoring
2017-02-09 - [R4] Title standardization
2017-02-28 - [R5] Adjust CVSS for worst-case scenario (AV:A -> AV:N)

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