- don't list nologin in /etc/shells (#1378893)

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website.
Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The remote Oracle Linux 7 host has a package installed that is affected by a vulnerability as referenced in the ELSA-2018-3249 advisory.

    [2.8.71-10]
    - fix crudp name in /etc/protocols (#1566469)
    - do not list /sbin/nologin and /usr/sbin/nologin in /etc/shells       (#1571104)

Tenable has extracted the preceding description block directly from the Oracle Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 6 host has one or more packages installed that are affected by a vulnerability that has been acknowledged by the vendor but will not be patched.

  - setup: nologin listed in /etc/shells violates security expectations (CVE-2018-1113)

Note that Nessus has not tested for this issue but has instead relied on the package manager's report that the package is installed.

The remote NewStart CGSL host, running version CORE 5.04 / MAIN 5.04, has setup packages installed that are affected by a vulnerability:

  - Setup in Fedora and Red Hat Enterprise Linux added     /sbin/nologin and /usr/sbin/nologin to /etc/shells. This     violates security assumptions made by pam_shells and     some daemons which allow access based on a user's shell     being listed in /etc/shells. Under some circumstances,     users which had their shell changed to /sbin/nologin     could still access the system. (CVE-2018-1113)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Security Fix(es) :

  - setup: nologin listed in /etc/shells violates security     expectations (CVE-2018-1113)

The remote Redhat Enterprise Linux 5 host has one or more packages installed that are affected by a vulnerability that has been acknowledged by the vendor but will not be patched.

  - setup: nologin listed in /etc/shells violates security expectations (CVE-2018-1113)

Note that Nessus has not tested for this issue but has instead relied on the package manager's report that the package is installed.

An update for setup is now available for Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having a security impact of Low. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link (s) in the References section.

The setup package contains a set of important default system configuration and setup files. Examples include /etc/passwd, /etc/group, and /etc/profile. Other examples are the default lists of reserved user IDs, reserved ports, reserved protocols, allowed shells, allowed secure terminals.

Security Fix(es) :

* setup: nologin listed in /etc/shells violates security expectations (CVE-2018-1113)

For more details about the security issue(s), including the impact, a CVSS score, and other related information, refer to the CVE page(s) listed in the References section.

Additional Changes :

For detailed information on changes in this release, see the Red Hat Enterprise Linux 7.6 Release Notes linked from the References section.

According to the version of the setup package installed, the EulerOS installation on the remote host is affected by the following vulnerability :

  - setup: nologin listed in /etc/shells violates security     expectations (CVE-2018-1113)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

This plugin has been deprecated as it does not adhere to established standards for this style of check.

According to the version of the setup package installed, the EulerOS Virtualization for ARM 64 installation on the remote host is affected by the following vulnerability :

  - setup before version 2.11.4-1.fc28 in Fedora and Red     Hat Enterprise Linux added /sbin/nologin and     /usr/sbin/nologin to /etc/shells. This violates     security assumptions made by pam_shells and some     daemons which allow access based on a user's shell     being listed in /etc/shells. Under some circumstances,     users which had their shell changed to /sbin/nologin     could still access the system. (CVE-2018-1113)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

Setup in Amazon Linux 2 added /sbin/nologin and /usr/sbin/nologin to /etc/shells. This violates security assumptions made by pam_shells and some daemons which allow access based on a user's shell being listed in /etc/shells. Under some circumstances, users which had their shell changed to /sbin/nologin could still access the system.
(CVE-2018-1113)

Please note: this update removes the `/sbin/nologin` and `/usr/sbin/nologin` login shells from the `/etc/shells` file due to security reasons. Consequently, when the configuration of the Very Secure File Transfer Protocol Daemon, *vsftpd*, is modified to enable the `chroot_local_user`, FTP logins are impossible.

To work around this problem, add `/sbin/nologin` or `/usr/sbin/nologin`, respectively, to the `/etc/shells` file. As a result, a login shell for users that are allowed to use FTP, but not SSH, is available again. However, note that this workaround exposes
*vsftpd* to the security risk described in this advisory.

The remote Redhat Enterprise Linux 7 host has a package installed that is affected by a vulnerability as referenced in the RHSA-2018:3249 advisory.

    The setup package contains a set of important default system configuration and setup files. Examples     include /etc/passwd, /etc/group, and /etc/profile. Other examples are the default lists of reserved user     IDs, reserved ports, reserved protocols, allowed shells, allowed secure terminals.

    Security Fix(es):

    * setup: nologin listed in /etc/shells violates security expectations (CVE-2018-1113)

    For more details about the security issue(s), including the impact, a CVSS score, and other related     information, refer to the CVE page(s) listed in the References section.

    Additional Changes:

    For detailed information on changes in this release, see the Red Hat Enterprise Linux 7.6 Release Notes     linked from the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Published	Updated	Severity
120908	Fedora 28 : setup (2018-f47268acd5)	Nessus	Fedora Local Security Checks	1/3/2019	6/28/2024	medium
118781	Oracle Linux 7 : setup (ELSA-2018-3249)	Nessus	Oracle Linux Local Security Checks	11/7/2018	11/1/2024	medium
199941	RHEL 6 : setup (Unpatched Vulnerability)	Nessus	Red Hat Local Security Checks	6/3/2024	6/3/2024	medium
127282	NewStart CGSL CORE 5.04 / MAIN 5.04 : setup Vulnerability (NS-SA-2019-0075)	Nessus	NewStart CGSL Local Security Checks	8/12/2019	1/14/2021	medium
119199	Scientific Linux Security Update : setup on SL7.x (noarch) (20181030)	Nessus	Scientific Linux Local Security Checks	11/27/2018	7/18/2024	medium
199937	RHEL 5 : setup (Unpatched Vulnerability)	Nessus	Red Hat Local Security Checks	6/3/2024	6/3/2024	medium
119001	CentOS 7 : setup (CESA-2018:3249)	Nessus	CentOS Local Security Checks	11/16/2018	4/8/2021	medium
119522	EulerOS 2.0 SP3 : setup (EulerOS-SA-2018-1394)	Nessus	Huawei Local Security Checks	12/10/2018	7/16/2024	medium
119910	EulerOS 2.0 SP2 : setup (EulerOS-SA-2018-1421)	Nessus	Huawei Local Security Checks	12/28/2018	7/12/2024	medium
196356	RHEL 5 : setup (Unpatched Vulnerability) (deprecated)	Nessus	Red Hat Local Security Checks	5/11/2024	5/31/2024	medium
124912	EulerOS Virtualization for ARM 64 3.0.1.0 : setup (EulerOS-SA-2019-1409)	Nessus	Huawei Local Security Checks	5/14/2019	5/23/2024	medium
196302	RHEL 6 : setup (Unpatched Vulnerability) (deprecated)	Nessus	Red Hat Local Security Checks	5/11/2024	5/31/2024	medium
122159	Amazon Linux 2 : setup (ALAS-2019-1158)	Nessus	Amazon Linux Local Security Checks	2/14/2019	6/20/2024	medium
118538	RHEL 7 : setup (RHSA-2018:3249)	Nessus	Red Hat Local Security Checks	10/31/2018	11/5/2024	medium

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