Debian LTS: Security Advisory for libexif (DLA-2222-1)

# Copyright (C) 2020 Greenbone Networks GmbH
# 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-or-later
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.892222");
  script_version("2020-05-29T03:00:09+0000");
  script_cve_id("CVE-2018-20030", "CVE-2020-0093", "CVE-2020-13112", "CVE-2020-13113", "CVE-2020-13114");
  script_tag(name:"cvss_base", value:"7.8");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:N/I:N/A:C");
  script_tag(name:"last_modification", value:"2020-05-29 03:00:09 +0000 (Fri, 29 May 2020)");
  script_tag(name:"creation_date", value:"2020-05-29 03:00:09 +0000 (Fri, 29 May 2020)");
  script_name("Debian LTS: Security Advisory for libexif (DLA-2222-1)");
  script_category(ACT_GATHER_INFO);
  script_copyright("Copyright (C) 2020 Greenbone Networks GmbH");
  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=DEB8");

  script_xref(name:"URL", value:"https://lists.debian.org/debian-lts-announce/2020/05/msg00025.html");
  script_xref(name:"URL", value:"https://security-tracker.debian.org/tracker/DLA-2222-1");
  script_xref(name:"URL", value:"https://bugs.debian.org/918730");
  script_xref(name:"URL", value:"https://bugs.debian.org/961407");
  script_xref(name:"URL", value:"https://bugs.debian.org/961409");
  script_xref(name:"URL", value:"https://bugs.debian.org/961410");

  script_tag(name:"summary", value:"The remote host is missing an update for the 'libexif'
  package(s) announced via the DLA-2222-1 advisory.");

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

  script_tag(name:"insight", value:"Various minor vulnerabilities have been addredd in libexif, a library to
parse EXIF metadata files.

CVE-2018-20030

This issue had already been addressed via DLA-2214-1. However, upstream
provided an updated patch, so this has been followed up on.

CVE-2020-13112

Several buffer over-reads in EXIF MakerNote handling could have lead
to information disclosure and crashes. This issue is different from
already resolved CVE-2020-0093.

CVE-2020-13113

Use of uninitialized memory in EXIF Makernote handling could have
lead to crashes and potential use-after-free conditions.

CVE-2020-13114

An unrestricted size in handling Canon EXIF MakerNote data could have
lead to consumption of large amounts of compute time for decoding
EXIF data.");

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

  script_tag(name:"solution", value:"For Debian 8 'Jessie', these problems have been fixed in version
0.6.21-2+deb8u3.

We recommend that you upgrade your libexif packages.");

  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");

res = "";
report = "";
if(!isnull(res = isdpkgvuln(pkg:"libexif-dev", ver:"0.6.21-2+deb8u3", rls:"DEB8"))) {
  report += res;
}
if(!isnull(res = isdpkgvuln(pkg:"libexif12", ver:"0.6.21-2+deb8u3", rls:"DEB8"))) {
  report += res;
}

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

exit(0);