Debian: Security Advisory (DLA-3312-1)

# 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("1.3.6.1.4.1.25623.1.0.893312");
  script_tag(name:"creation_date", value:"2023-02-09 02:00:18 +0000 (Thu, 09 Feb 2023)");
  script_version("2024-01-12T16:12:12+0000");
  script_tag(name:"last_modification", value:"2024-01-12 16:12:12 +0000 (Fri, 12 Jan 2024)");
  script_tag(name:"cvss_base", value:"5.0");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:P/I:N/A:N");

  script_name("Debian: Security Advisory (DLA-3312-1)");
  script_category(ACT_GATHER_INFO);
  script_copyright("Copyright (C) 2023 Greenbone AG");
  script_family("Debian Local Security Checks");
  script_dependencies("gather-package-list.nasl");
  script_mandatory_keys("ssh/login/debian_linux", "ssh/login/packages", re:"ssh/login/release=DEB10");

  script_xref(name:"Advisory-ID", value:"DLA-3312-1");
  script_xref(name:"URL", value:"https://www.debian.org/lts/security/2023/DLA-3312-1");
  script_xref(name:"URL", value:"https://security-tracker.debian.org/tracker/shim");
  script_xref(name:"URL", value:"https://wiki.debian.org/LTS");

  script_tag(name:"summary", value:"The remote host is missing an update for the Debian 'shim' package(s) announced via the DLA-3312-1 advisory.");

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

  script_tag(name:"insight", value:"This release fixes various issues in shim bootloader and updates it to a supported version. Older versions of the shim may eventually be blocked by Secure Boot, so it is strongly advised for Secure Boot enabled systems to upgrade to this newer version to keep the system bootable.

Additionally, this update blocks old, insecure versions of GRUB. Thus an update to a signed GRUB 2.06-3~deb10u3 package as released in DLA 3190-2 must be in place prior to updating the shim packages.

For Debian 10 buster, this problem has been fixed in version 15.7-1~deb10u1.

We recommend that you upgrade your shim packages.

For the detailed security status of shim please refer to its security tracker page at: [link moved to references]

Further information about Debian LTS security advisories, how to apply these updates to your system and frequently asked questions can be found at: [link moved to references]");

  script_tag(name:"affected", value:"'shim' package(s) on Debian 10.");

  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 == "DEB10") {

  if(!isnull(res = isdpkgvuln(pkg:"shim-helpers-amd64-signed-template", ver:"15.7-1~deb10u1", rls:"DEB10"))) {
    report += res;
  }

  if(!isnull(res = isdpkgvuln(pkg:"shim-helpers-arm64-signed-template", ver:"15.7-1~deb10u1", rls:"DEB10"))) {
    report += res;
  }

  if(!isnull(res = isdpkgvuln(pkg:"shim-helpers-i386-signed-template", ver:"15.7-1~deb10u1", rls:"DEB10"))) {
    report += res;
  }

  if(!isnull(res = isdpkgvuln(pkg:"shim-unsigned", ver:"15.7-1~deb10u1", rls:"DEB10"))) {
    report += res;
  }

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

exit(0);