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[R3] Tenable Appliance Affected by GNU C Library (glibc) Vulnerability

High
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Synopsis

The Tenable Appliance is built on a Linux distribution that utilizes the GNU C Library (glibc). A vulnerability was recently reported impacting glibc, which may impact the Appliance. According to the researchers, glibc contains an overflow condition in the send_dg() and send_vc() functions in libresolv resolv/res_send.c where input is not properly validated when looking up domain names via the getaddrinfo() call. This may allow a remote attacker to cause a stack-based buffer overflow, resulting in a denial of service or potentially allowing the execution of arbitrary code.

Solution

A glibc update is available via the online repositories, which are checked every night by the appliance. When the update is found a notification will appear in the administrative interface. Appliance administrators will need to direct the system to apply the updates so as not to interfere with scanning activities.

Additional References

https://googleonlinesecurity.blogspot.com/2016/02/cve-2015-7547-glibc-getaddrinfo-stack.html

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-2015-7547
Tenable Advisory ID: TNS-2016-05
Risk Factor: High
CVSSv2 Base / Temporal Score
9.3 / 6.9
CVSSv2 Vector:
(AV:N/AC:M/Au:N/C:C/I:C/A:C/E:U/RL:OF/RC:C)

Affected Products

Tenable Appliance: 4.0.0

Disclosure Timeline

2016-02-16 - GNU C Library (glibc) solution available
2016-02-17 - glibc Patch QA Cycle begins
206-03-07 - Appliance glibc package update available

Advisory Timeline

2016-03-14 - [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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