The McAfee VirusScan Enterprise for Linux 1.9.x/2.0.x On-Access scanner must be configured to decompress archives when scanning.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-63077	DTAVSEL-004	SV-77567r1_rule		Medium

Description
Malware can be hidden within archived files and passed from system to system undetected unless the archive is decompressed and each file scanned. By disabling the archive scanning capability, archives such as .tar and .tgz files will not be decompressed and any infected files in the archives would go undetected. Decompression can slow performance, however; any virus-infected file inside an archive cannot become active until it has been extracted. Recognizing the slow performance potential

Description

Malware can be hidden within archived files and passed from system to system undetected unless the archive is decompressed and each file scanned. By disabling the archive scanning capability, archives such as .tar and .tgz files will not be decompressed and any infected files in the archives would go undetected. Decompression can slow performance, however; any virus-infected file inside an archive cannot become active until it has been extracted. Recognizing the slow performance potential

STIG	Date
McAfee VSEL 1.9/2.0 Local Client Security Technical Implementation Guide	2015-11-30

Details

Check Text ( C-63829r1_chk )
From a desktop browser window, connect to the McAfee VirusScan Enterprise for Linux (VSEL) Monitor (WEB interface) of the Linux system being reviewed and logon with the nails user account. In the VSEL WEB Monitor, under "Configure", select "On-Access Settings". Under "Anti-virus Scanning Options", verify the "Decompress archives" check box is selected. If the check box "Decompress archives" is not selected, this is a finding. If the check box for "Decompress archives" is not selected but the On-Demand scan decompress of archives is configured in the regularly scheduled scan, as specified in STIG ID DTAVSEL-101, this is a finding and severity of this can be dropped to a CAT 3. To validate without the Web interface, access the Linux system being reviewed, either at the console or by a SSH connection. At the command line, navigate to /var/opt/NAI/LinuxShield/etc. Enter the command "grep "decompArchive" nailsd.cfg" If the response given includes "nailsd.profile.OAS.decompArchive: false" or includes "nailsd.profile.OAS.decompArchive: true" with a preceding #, this is a finding.

Check Text ( C-63829r1_chk )

From a desktop browser window, connect to the McAfee VirusScan Enterprise for Linux (VSEL) Monitor (WEB interface) of the Linux system being reviewed and logon with the nails user account.

In the VSEL WEB Monitor, under "Configure", select "On-Access Settings".
Under "Anti-virus Scanning Options", verify the "Decompress archives" check box is selected.

If the check box "Decompress archives" is not selected, this is a finding.

If the check box for "Decompress archives" is not selected but the On-Demand scan decompress of archives is configured in the regularly scheduled scan, as specified in STIG ID DTAVSEL-101, this is a finding and severity of this can be dropped to a CAT 3.

To validate without the Web interface, access the Linux system being reviewed, either at the console or by a SSH connection.
At the command line, navigate to /var/opt/NAI/LinuxShield/etc.
Enter the command "grep "decompArchive" nailsd.cfg"

If the response given includes "nailsd.profile.OAS.decompArchive: false" or includes "nailsd.profile.OAS.decompArchive: true" with a preceding #, this is a finding.

Fix Text (F-68995r1_fix)
From a desktop browser window, connect to the McAfee VirusScan Enterprise for Linux (VSEL) Monitor (WEB interface) of the Linux system being reviewed and logon with the nails user account. In the VSEL WEB Monitor, under "Configure", select "On-Access Settings". Under "Anti-virus Scanning Options", select the "Decompress archives" check box. Click "Apply".