CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:M/Au:N/C:P/I:P/A:P
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
AI Score
Confidence
High
EPSS
Percentile
61.4%
The remote host is missing an update for the
# SPDX-FileCopyrightText: 2020 Greenbone AG
# Some text descriptions might be excerpted from (a) referenced
# source(s), and are Copyright (C) by the respective right holder(s).
#
# SPDX-License-Identifier: GPL-2.0-only
if(description)
{
script_oid("1.3.6.1.4.1.25623.1.0.844451");
script_cve_id("CVE-2019-19377", "CVE-2020-11565", "CVE-2020-12657");
script_tag(name:"creation_date", value:"2020-05-29 03:00:39 +0000 (Fri, 29 May 2020)");
script_version("2024-02-02T05:06:07+0000");
script_tag(name:"last_modification", value:"2024-02-02 05:06:07 +0000 (Fri, 02 Feb 2024)");
script_tag(name:"cvss_base", value:"6.8");
script_tag(name:"cvss_base_vector", value:"AV:N/AC:M/Au:N/C:P/I:P/A:P");
script_tag(name:"severity_vector", value:"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H");
script_tag(name:"severity_origin", value:"NVD");
script_tag(name:"severity_date", value:"2020-05-07 20:57:04 +0000 (Thu, 07 May 2020)");
script_name("Ubuntu: Security Advisory (USN-4367-2)");
script_category(ACT_GATHER_INFO);
script_copyright("Copyright (C) 2020 Greenbone AG");
script_family("Ubuntu Local Security Checks");
script_dependencies("gather-package-list.nasl");
script_mandatory_keys("ssh/login/ubuntu_linux", "ssh/login/packages", re:"ssh/login/release=UBUNTU20\.04\ LTS");
script_xref(name:"Advisory-ID", value:"USN-4367-2");
script_xref(name:"URL", value:"https://ubuntu.com/security/notices/USN-4367-2");
script_xref(name:"URL", value:"https://launchpad.net/bugs/1879690");
script_tag(name:"summary", value:"The remote host is missing an update for the 'linux' package(s) announced via the USN-4367-2 advisory.");
script_tag(name:"vuldetect", value:"Checks if a vulnerable package version is present on the target host.");
script_tag(name:"insight", value:"USN-4367-1 fixed vulnerabilities in the 5.4 Linux kernel. Unfortunately,
that update introduced a regression in overlayfs. This update corrects
the problem.
We apologize for the inconvenience.
Original advisory details:
It was discovered that the btrfs implementation in the Linux kernel did not
properly detect that a block was marked dirty in some situations. An
attacker could use this to specially craft a file system image that, when
unmounted, could cause a denial of service (system crash). (CVE-2019-19377)
It was discovered that the linux kernel did not properly validate certain
mount options to the tmpfs virtual memory file system. A local attacker
with the ability to specify mount options could use this to cause a denial
of service (system crash). (CVE-2020-11565)
It was discovered that the block layer in the Linux kernel contained a race
condition leading to a use-after-free vulnerability. A local attacker could
possibly use this to cause a denial of service (system crash) or execute
arbitrary code. (CVE-2020-12657)");
script_tag(name:"affected", value:"'linux' package(s) on Ubuntu 20.04.");
script_tag(name:"solution", value:"Please install the updated package(s).");
script_tag(name:"solution_type", value:"VendorFix");
script_tag(name:"qod_type", value:"package");
exit(0);
}
include("revisions-lib.inc");
include("pkg-lib-deb.inc");
release = dpkg_get_ssh_release();
if(!release)
exit(0);
res = "";
report = "";
if(release == "UBUNTU20.04 LTS") {
if(!isnull(res = isdpkgvuln(pkg:"linux-image-5.4.0-33-generic", ver:"5.4.0-33.37", rls:"UBUNTU20.04 LTS"))) {
report += res;
}
if(!isnull(res = isdpkgvuln(pkg:"linux-image-5.4.0-33-generic-lpae", ver:"5.4.0-33.37", rls:"UBUNTU20.04 LTS"))) {
report += res;
}
if(!isnull(res = isdpkgvuln(pkg:"linux-image-5.4.0-33-lowlatency", ver:"5.4.0-33.37", rls:"UBUNTU20.04 LTS"))) {
report += res;
}
if(!isnull(res = isdpkgvuln(pkg:"linux-image-generic", ver:"5.4.0.33.38", rls:"UBUNTU20.04 LTS"))) {
report += res;
}
if(!isnull(res = isdpkgvuln(pkg:"linux-image-generic-lpae", ver:"5.4.0.33.38", rls:"UBUNTU20.04 LTS"))) {
report += res;
}
if(!isnull(res = isdpkgvuln(pkg:"linux-image-lowlatency", ver:"5.4.0.33.38", rls:"UBUNTU20.04 LTS"))) {
report += res;
}
if(!isnull(res = isdpkgvuln(pkg:"linux-image-oem", ver:"5.4.0.33.38", rls:"UBUNTU20.04 LTS"))) {
report += res;
}
if(!isnull(res = isdpkgvuln(pkg:"linux-image-oem-osp1", ver:"5.4.0.33.38", rls:"UBUNTU20.04 LTS"))) {
report += res;
}
if(!isnull(res = isdpkgvuln(pkg:"linux-image-virtual", ver:"5.4.0.33.38", rls:"UBUNTU20.04 LTS"))) {
report += res;
}
if(report != "") {
security_message(data:report);
} else if(__pkg_match) {
exit(99);
}
exit(0);
}
exit(0);
CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:M/Au:N/C:P/I:P/A:P
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
AI Score
Confidence
High
EPSS
Percentile
61.4%