CVSS2
Attack Vector
LOCAL
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
NONE
AV:L/AC:M/Au:N/C:P/I:N/A:N
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
AI Score
Confidence
High
EPSS
Percentile
50.6%
The remote host is affected by the vulnerability described in GLSA-202401-08 (util-linux: Multiple Vulnerabilities)
A logic error was found in the libmount library of util-linux in the function that allows an unprivileged user to unmount a FUSE filesystem. This flaw allows an unprivileged local attacker to unmount FUSE filesystems that belong to certain other users who have a UID that is a prefix of the UID of the attacker in its string form. An attacker may use this flaw to cause a denial of service to applications that use the affected filesystems. (CVE-2021-3995)
A logic error was found in the libmount library of util-linux in the function that allows an unprivileged user to unmount a FUSE filesystem. This flaw allows a local user on a vulnerable system to unmount other users’ filesystems that are either world-writable themselves (like /tmp) or mounted in a world-writable directory. An attacker may use this flaw to cause a denial of service to applications that use the affected filesystems. (CVE-2021-3996)
An integer overflow in util-linux through 2.37.1 can potentially cause a buffer overflow if an attacker were able to use system resources in a way that leads to a large number in the /proc/sysvipc/sem file.
NOTE: this is unexploitable in GNU C Library environments, and possibly in all realistic environments (CVE-2021-37600)
A flaw was found in the util-linux chfn and chsh utilities when compiled with Readline support. The Readline library uses an INPUTRC environment variable to get a path to the library config file. When the library cannot parse the specified file, it prints an error message containing data from the file. This flaw allows an unprivileged user to read root-owned files, potentially leading to privilege escalation.
This flaw affects util-linux versions prior to 2.37.4. (CVE-2022-0563)
Note that Nessus has not tested for these issues but has instead relied only on the application’s self-reported version number.
#%NASL_MIN_LEVEL 80900
#
# (C) Tenable, Inc.
#
# @NOAGENT@
#
# The descriptive text and package checks in this plugin were
# extracted from Gentoo Linux Security Advisory GLSA 202401-08.
#
# The advisory text is Copyright (C) 2001-2021 Gentoo Foundation, Inc.
# and licensed under the Creative Commons - Attribution / Share Alike
# license. See http://creativecommons.org/licenses/by-sa/3.0/
#
include('compat.inc');
if (description)
{
script_id(187668);
script_version("1.0");
script_set_attribute(attribute:"plugin_modification_date", value:"2024/01/07");
script_cve_id(
"CVE-2021-3995",
"CVE-2021-3996",
"CVE-2021-37600",
"CVE-2022-0563"
);
script_name(english:"GLSA-202401-08 : util-linux: Multiple Vulnerabilities");
script_set_attribute(attribute:"synopsis", value:
"");
script_set_attribute(attribute:"description", value:
"The remote host is affected by the vulnerability described in GLSA-202401-08 (util-linux: Multiple Vulnerabilities)
- A logic error was found in the libmount library of util-linux in the function that allows an unprivileged
user to unmount a FUSE filesystem. This flaw allows an unprivileged local attacker to unmount FUSE
filesystems that belong to certain other users who have a UID that is a prefix of the UID of the attacker
in its string form. An attacker may use this flaw to cause a denial of service to applications that use
the affected filesystems. (CVE-2021-3995)
- A logic error was found in the libmount library of util-linux in the function that allows an unprivileged
user to unmount a FUSE filesystem. This flaw allows a local user on a vulnerable system to unmount other
users' filesystems that are either world-writable themselves (like /tmp) or mounted in a world-writable
directory. An attacker may use this flaw to cause a denial of service to applications that use the
affected filesystems. (CVE-2021-3996)
- An integer overflow in util-linux through 2.37.1 can potentially cause a buffer overflow if an attacker
were able to use system resources in a way that leads to a large number in the /proc/sysvipc/sem file.
NOTE: this is unexploitable in GNU C Library environments, and possibly in all realistic environments
(CVE-2021-37600)
- A flaw was found in the util-linux chfn and chsh utilities when compiled with Readline support. The
Readline library uses an INPUTRC environment variable to get a path to the library config file. When the
library cannot parse the specified file, it prints an error message containing data from the file. This
flaw allows an unprivileged user to read root-owned files, potentially leading to privilege escalation.
This flaw affects util-linux versions prior to 2.37.4. (CVE-2022-0563)
Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version
number.");
script_set_attribute(attribute:"see_also", value:"https://security.gentoo.org/glsa/202401-08");
script_set_attribute(attribute:"see_also", value:"https://bugs.gentoo.org/show_bug.cgi?id=806070");
script_set_attribute(attribute:"see_also", value:"https://bugs.gentoo.org/show_bug.cgi?id=831978");
script_set_attribute(attribute:"see_also", value:"https://bugs.gentoo.org/show_bug.cgi?id=833365");
script_set_attribute(attribute:"solution", value:
"All util-linux users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose >=sys-apps/util-linux-2.37.4");
script_set_cvss_base_vector("CVSS2#AV:L/AC:M/Au:N/C:P/I:N/A:N");
script_set_cvss_temporal_vector("CVSS2#E:POC/RL:OF/RC:C");
script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N");
script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
script_set_attribute(attribute:"cvss_score_source", value:"CVE-2022-0563");
script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
script_set_attribute(attribute:"exploit_available", value:"true");
script_set_attribute(attribute:"vuln_publication_date", value:"2021/07/30");
script_set_attribute(attribute:"patch_publication_date", value:"2024/01/07");
script_set_attribute(attribute:"plugin_publication_date", value:"2024/01/07");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:gentoo:linux:util-linux");
script_set_attribute(attribute:"cpe", value:"cpe:/o:gentoo:linux");
script_set_attribute(attribute:"generated_plugin", value:"current");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_family(english:"Gentoo Local Security Checks");
script_copyright(english:"This script is Copyright (C) 2024 and is owned by Tenable, Inc. or an Affiliate thereof.");
script_dependencies("ssh_get_info.nasl");
script_require_keys("Host/local_checks_enabled", "Host/Gentoo/release", "Host/Gentoo/qpkg-list");
exit(0);
}
include('qpkg.inc');
if (!get_kb_item('Host/local_checks_enabled')) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
if (!get_kb_item('Host/Gentoo/release')) audit(AUDIT_OS_NOT, 'Gentoo');
if (!get_kb_item('Host/Gentoo/qpkg-list')) audit(AUDIT_PACKAGE_LIST_MISSING);
var flag = 0;
var packages = [
{
'name' : 'sys-apps/util-linux',
'unaffected' : make_list("ge 2.37.4"),
'vulnerable' : make_list("lt 2.37.4")
}
];
foreach var package( packages ) {
if (isnull(package['unaffected'])) package['unaffected'] = make_list();
if (isnull(package['vulnerable'])) package['vulnerable'] = make_list();
if (qpkg_check(package: package['name'] , unaffected: package['unaffected'], vulnerable: package['vulnerable'])) flag++;
}
if (flag)
{
security_report_v4(
port : 0,
severity : SECURITY_NOTE,
extra : qpkg_report_get()
);
exit(0);
}
else
{
qpkg_tests = list_uniq(qpkg_tests);
var tested = qpkg_tests_get();
if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'util-linux');
}
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-37600
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-3995
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-3996
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-0563
bugs.gentoo.org/show_bug.cgi?id=806070
bugs.gentoo.org/show_bug.cgi?id=831978
bugs.gentoo.org/show_bug.cgi?id=833365
security.gentoo.org/glsa/202401-08
CVSS2
Attack Vector
LOCAL
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
NONE
AV:L/AC:M/Au:N/C:P/I:N/A:N
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
AI Score
Confidence
High
EPSS
Percentile
50.6%