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openvasCopyright (C) 2022 Greenbone AGOPENVAS:13614125623111020210100
HistoryJan 28, 2022 - 12:00 a.m.

Mageia: Security Advisory (MGASA-2021-0100)

2022-01-2800:00:00
Copyright (C) 2022 Greenbone AG
plugins.openvas.org
10
mageia linux
kernel-linus
security advisory
update
cve-2021-20194
cve-2021-21781
cve-2021-26930

CVSS2

4.6

Attack Vector

LOCAL

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

AV:L/AC:L/Au:N/C:P/I:P/A:P

CVSS3

7.8

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

6.7

Confidence

Low

EPSS

0

Percentile

15.7%

The remote host is missing an update for the

# SPDX-FileCopyrightText: 2022 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("1.3.6.1.4.1.25623.1.1.10.2021.0100");
  script_cve_id("CVE-2021-20194", "CVE-2021-21781", "CVE-2021-26930", "CVE-2021-26931", "CVE-2021-26932");
  script_tag(name:"creation_date", value:"2022-01-28 10:58:44 +0000 (Fri, 28 Jan 2022)");
  script_version("2024-02-02T05:06:09+0000");
  script_tag(name:"last_modification", value:"2024-02-02 05:06:09 +0000 (Fri, 02 Feb 2024)");
  script_tag(name:"cvss_base", value:"4.6");
  script_tag(name:"cvss_base_vector", value:"AV:L/AC:L/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:"2021-02-23 18:35:29 +0000 (Tue, 23 Feb 2021)");

  script_name("Mageia: Security Advisory (MGASA-2021-0100)");
  script_category(ACT_GATHER_INFO);
  script_copyright("Copyright (C) 2022 Greenbone AG");
  script_family("Mageia Linux Local Security Checks");
  script_dependencies("gather-package-list.nasl");
  script_mandatory_keys("ssh/login/mageia_linux", "ssh/login/release", re:"ssh/login/release=MAGEIA7");

  script_xref(name:"Advisory-ID", value:"MGASA-2021-0100");
  script_xref(name:"URL", value:"https://advisories.mageia.org/MGASA-2021-0100.html");
  script_xref(name:"URL", value:"https://bugs.mageia.org/show_bug.cgi?id=28468");
  script_xref(name:"URL", value:"https://bugs.mageia.org/show_bug.cgi?id=28415");
  script_xref(name:"URL", value:"https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.15");
  script_xref(name:"URL", value:"https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.16");
  script_xref(name:"URL", value:"https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.17");
  script_xref(name:"URL", value:"https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.18");
  script_xref(name:"URL", value:"https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.19");

  script_tag(name:"summary", value:"The remote host is missing an update for the 'kernel-linus' package(s) announced via the MGASA-2021-0100 advisory.");

  script_tag(name:"vuldetect", value:"Checks if a vulnerable package version is present on the target host.");

  script_tag(name:"insight", value:"This kernel-linus update is based on upstream 5.10.19 and fixes at least
the following security issues:

There is a vulnerability in the linux kernel versions higher than 5.2 (if
kernel compiled with config params CONFIG_BPF_SYSCALL=y, CONFIG_BPF=y,
CONFIG_CGROUPS=y, CONFIG_CGROUP_BPF=y, CONFIG_HARDENED_USERCOPY not set,
and BPF hook to getsockopt is registered). As result of BPF execution,
the local user can trigger bug in __cgroup_bpf_run_filter_getsockopt()
function that can lead to heap overflow (because of non-hardened
usercopy). The impact of attack could be deny of service or possibly
privileges escalation. NOTE! Mageia kernel configs have HARDENED_USERCOPY
enabled by default, making this an non-issue when using prebuilt kernels
(CVE-2021-20194).

An information disclosure vulnerability exists in the ARM SIGPAGE
functionality of Linux Kernel. A userland application can read the
contents of the sigpage, which can leak kernel memory contents. An
attacker can read a process's memory at a specific offset to trigger
this vulnerability (CVE-2021-21781).

An issue was discovered in the Linux kernel 3.11 through 5.10.16, as used
by Xen. To service requests to the PV backend, the driver maps grant
references provided by the frontend. In this process, errors may be
encountered. In one case, an error encountered earlier might be
discarded by later processing, resulting in the caller assuming
successful mapping, and hence subsequent operations trying to access
space that wasn't mapped. In another case, internal state would be
insufficiently updated, preventing safe recovery from the error
(CVE-2021-26930).

An issue was discovered in the Linux kernel 2.6.39 through 5.10.16, as
used in Xen. Block, net, and SCSI backends consider certain errors a
plain bug, deliberately causing a kernel crash. For errors potentially
being at least under the influence of guests (such as out of memory
conditions), it isn't correct to assume a plain bug. Memory allocations
potentially causing such crashes occur only when Linux is running in
PV mode, though (CVE-2021-26931).

An issue was discovered in the Linux kernel 3.2 through 5.10.16, as used
by Xen. Grant mapping operations often occur in batch hypercalls, where
a number of operations are done in a single hypercall, the success or
failure of each one is reported to the backend driver, and the backend
driver then loops over the results, performing follow-up actions based
on the success or failure of each operation. Unfortunately, when running
in PV mode, the Linux backend drivers mishandle this: Some errors are
ignored, effectively implying their success from the success of related
batch elements. In other cases, errors resulting from one batch element
lead to further batch elements not being inspected, and hence successful
ones to not be possible to properly unmap upon error recovery. Only
systems with Linux backends running in PV mode are ... [Please see the references for more information on the vulnerabilities]");

  script_tag(name:"affected", value:"'kernel-linus' package(s) on Mageia 7.");

  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-rpm.inc");

release = rpm_get_ssh_release();
if(!release)
  exit(0);

res = "";
report = "";

if(release == "MAGEIA7") {

  if(!isnull(res = isrpmvuln(pkg:"kernel-linus-5.10.19-1.mga7", rpm:"kernel-linus-5.10.19-1.mga7~1~1.mga7", rls:"MAGEIA7"))) {
    report += res;
  }

  if(!isnull(res = isrpmvuln(pkg:"kernel-linus", rpm:"kernel-linus~5.10.19~1.mga7", rls:"MAGEIA7"))) {
    report += res;
  }

  if(!isnull(res = isrpmvuln(pkg:"kernel-linus-devel-5.10.19-1.mga7", rpm:"kernel-linus-devel-5.10.19-1.mga7~1~1.mga7", rls:"MAGEIA7"))) {
    report += res;
  }

  if(!isnull(res = isrpmvuln(pkg:"kernel-linus-devel-latest", rpm:"kernel-linus-devel-latest~5.10.19~1.mga7", rls:"MAGEIA7"))) {
    report += res;
  }

  if(!isnull(res = isrpmvuln(pkg:"kernel-linus-doc", rpm:"kernel-linus-doc~5.10.19~1.mga7", rls:"MAGEIA7"))) {
    report += res;
  }

  if(!isnull(res = isrpmvuln(pkg:"kernel-linus-latest", rpm:"kernel-linus-latest~5.10.19~1.mga7", rls:"MAGEIA7"))) {
    report += res;
  }

  if(!isnull(res = isrpmvuln(pkg:"kernel-linus-source-5.10.19-1.mga7", rpm:"kernel-linus-source-5.10.19-1.mga7~1~1.mga7", rls:"MAGEIA7"))) {
    report += res;
  }

  if(!isnull(res = isrpmvuln(pkg:"kernel-linus-source-latest", rpm:"kernel-linus-source-latest~5.10.19~1.mga7", rls:"MAGEIA7"))) {
    report += res;
  }

  if(report != "") {
    security_message(data:report);
  } else if(__pkg_match) {
    exit(99);
  }
  exit(0);
}

exit(0);

CVSS2

4.6

Attack Vector

LOCAL

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

AV:L/AC:L/Au:N/C:P/I:P/A:P

CVSS3

7.8

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

6.7

Confidence

Low

EPSS

0

Percentile

15.7%