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[R3] Log Correlation Engine (LCE) 4.8.0 Fixes Third-party Library

Medium
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Synopsis

The Log Correlation Engine (LCE) uses the third-party Libxml2 library for some XML parsing routines. A vulnerability was found and patched in Libxml2 recently. Tenable has not evaluated this vulnerability beyond acknowledging that user-supplied XML input can be parsed by LCE. As such, the developer team upgraded the library as a precaution without further testing (that is "possibly affected" for mature vulnerability databases!). <doge>Very speed, less risk</doge>!

CVE-2015-8035 - Libxml2 contains an infinite loop condition in the xz_decomp() function in xzlib.c that is triggered when handling xz compressed XML content. This may allow a context-dependent attacker to exhaust available system resources.

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

Solution

Log Correlation Engine (LCE)

Tenable has released the Log Correlation Engine (LCE) 4.8.0 that address this potential issue. The updated version can be found at:

https://support.tenable.com/support-center/index.php?x=&mod_id=180

Additional References

http://seclists.org/oss-sec/2015/q4/206

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

CVE ID: CVE-2015-8035
Tenable Advisory ID: TNS-2016-06
Risk Factor: Medium
CVSSv2 Base / Temporal Score
4.3 / 3.2
CVSSv2 Vector:
(AV:N/AC:M/Au:N/C:N/I:N/A:P/E:U/RL:OF/RC:C)

Affected Products

Log Correlation Engine (LCE) 4.6.0, 4.6.1

Disclosure Timeline

2015-11-02 - Libxml2 DoS weakness disclosed
2015-11-20 - Libxml2 releases fixed version

Advisory Timeline

2016-03-24 - [R1] Initial Release
2016-11-12 - [R2] Adjust CVSSv2 score
2017-02-28 - [R3] Adjust CVSS for worst-case scenario (AV:A -> AV:N)
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