Huawei EulerOS: Security Advisory for grub2 (EulerOS-SA-2023-1386)

# SPDX-FileCopyrightText: 2023 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("1.3.6.1.4.1.25623.1.1.2.2023.1386");
  script_cve_id("CVE-2020-27779", "CVE-2022-2601", "CVE-2022-3775");
  script_tag(name:"creation_date", value:"2023-02-10 07:19:12 +0000 (Fri, 10 Feb 2023)");
  script_version("2024-02-05T14:36:57+0000");
  script_tag(name:"last_modification", value:"2024-02-05 14:36:57 +0000 (Mon, 05 Feb 2024)");
  script_tag(name:"cvss_base", value:"6.9");
  script_tag(name:"cvss_base_vector", value:"AV:L/AC:M/Au:N/C:C/I:C/A:C");
  script_tag(name:"severity_vector", value:"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H");
  script_tag(name:"severity_origin", value:"NVD");
  script_tag(name:"severity_date", value:"2022-12-16 21:29:14 +0000 (Fri, 16 Dec 2022)");

  script_name("Huawei EulerOS: Security Advisory for grub2 (EulerOS-SA-2023-1386)");
  script_category(ACT_GATHER_INFO);
  script_copyright("Copyright (C) 2023 Greenbone AG");
  script_family("Huawei EulerOS Local Security Checks");
  script_dependencies("gb_huawei_euleros_consolidation.nasl");
  script_mandatory_keys("ssh/login/euleros", "ssh/login/rpms", re:"ssh/login/release=EULEROS\-2\.0SP10\-X86_64");

  script_xref(name:"Advisory-ID", value:"EulerOS-SA-2023-1386");
  script_xref(name:"URL", value:"https://developer.huaweicloud.com/intl/en-us/euleros/securitydetail.html?secId=EulerOS-SA-2023-1386");

  script_tag(name:"summary", value:"The remote host is missing an update for the Huawei EulerOS 'grub2' package(s) announced via the EulerOS-SA-2023-1386 advisory.");

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

  script_tag(name:"insight", value:"A flaw was found where a maliciously crafted pf2 font could lead to an out-of-bounds write in grub2. A successful attack can lead to memory corruption and secure boot circumvention.(CVE-2022-2601)

When rendering certain unicode sequences, grub2's font code doesn't proper validate if the informed glyph's width and height is constrained within bitmap size. As consequence an attacker can craft an input which will lead to a out-of-bounds write into grub2's heap, leading to memory corruption and availability issues. Although complex, arbitrary code execution could not be discarded.(CVE-2022-3775)

A flaw was found in grub2 in versions prior to 2.06. The cutmem command does not honor secure boot locking allowing an privileged attacker to remove address ranges from memory creating an opportunity to circumvent SecureBoot protections after proper triage about grub's memory layout. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.(CVE-2020-27779)");

  script_tag(name:"affected", value:"'grub2' package(s) on Huawei EulerOS V2.0SP10(x86_64).");

  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 == "EULEROS-2.0SP10-x86_64") {

  if(!isnull(res = isrpmvuln(pkg:"grub2-common", rpm:"grub2-common~2.04~16.h43.eulerosv2r10", rls:"EULEROS-2.0SP10-x86_64"))) {
    report += res;
  }

  if(!isnull(res = isrpmvuln(pkg:"grub2-efi-x64", rpm:"grub2-efi-x64~2.04~16.h43.eulerosv2r10", rls:"EULEROS-2.0SP10-x86_64"))) {
    report += res;
  }

  if(!isnull(res = isrpmvuln(pkg:"grub2-efi-x64-modules", rpm:"grub2-efi-x64-modules~2.04~16.h43.eulerosv2r10", rls:"EULEROS-2.0SP10-x86_64"))) {
    report += res;
  }

  if(!isnull(res = isrpmvuln(pkg:"grub2-pc", rpm:"grub2-pc~2.04~16.h43.eulerosv2r10", rls:"EULEROS-2.0SP10-x86_64"))) {
    report += res;
  }

  if(!isnull(res = isrpmvuln(pkg:"grub2-pc-modules", rpm:"grub2-pc-modules~2.04~16.h43.eulerosv2r10", rls:"EULEROS-2.0SP10-x86_64"))) {
    report += res;
  }

  if(!isnull(res = isrpmvuln(pkg:"grub2-tools", rpm:"grub2-tools~2.04~16.h43.eulerosv2r10", rls:"EULEROS-2.0SP10-x86_64"))) {
    report += res;
  }

  if(!isnull(res = isrpmvuln(pkg:"grub2-tools-efi", rpm:"grub2-tools-efi~2.04~16.h43.eulerosv2r10", rls:"EULEROS-2.0SP10-x86_64"))) {
    report += res;
  }

  if(!isnull(res = isrpmvuln(pkg:"grub2-tools-extra", rpm:"grub2-tools-extra~2.04~16.h43.eulerosv2r10", rls:"EULEROS-2.0SP10-x86_64"))) {
    report += res;
  }

  if(!isnull(res = isrpmvuln(pkg:"grub2-tools-minimal", rpm:"grub2-tools-minimal~2.04~16.h43.eulerosv2r10", rls:"EULEROS-2.0SP10-x86_64"))) {
    report += res;
  }

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

exit(0);