Ubuntu: Security Advisory (USN-4246-1)

# 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("1.3.6.1.4.1.25623.1.0.844303");
  script_cve_id("CVE-2016-9840", "CVE-2016-9841", "CVE-2016-9842", "CVE-2016-9843");
  script_tag(name:"creation_date", value:"2020-01-23 04:00:20 +0000 (Thu, 23 Jan 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:"7.5");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:P/I:P/A:P");
  script_tag(name:"severity_vector", value:"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H");
  script_tag(name:"severity_origin", value:"NVD");
  script_tag(name:"severity_date", value:"2017-06-01 16:47:18 +0000 (Thu, 01 Jun 2017)");

  script_name("Ubuntu: Security Advisory (USN-4246-1)");
  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=UBUNTU16\.04\ LTS");

  script_xref(name:"Advisory-ID", value:"USN-4246-1");
  script_xref(name:"URL", value:"https://ubuntu.com/security/notices/USN-4246-1");

  script_tag(name:"summary", value:"The remote host is missing an update for the 'zlib' package(s) announced via the USN-4246-1 advisory.");

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

  script_tag(name:"insight", value:"It was discovered that zlib incorrectly handled pointer arithmetic. An attacker
could use this issue to cause zlib to crash, resulting in a denial of
service, or possibly execute arbitrary code. (CVE-2016-9840, CVE-2016-9841)

It was discovered that zlib incorrectly handled vectors involving left shifts of
negative integers. An attacker could use this issue to cause zlib to
crash, resulting in a denial of service, or possibly execute arbitrary code.
(CVE-2016-9842)

It was discovered that zlib incorrectly handled vectors involving big-endian CRC
calculation. An attacker could use this issue to cause zlib to crash,
resulting in a denial of service, or possibly execute arbitrary code.
(CVE-2016-9843)");

  script_tag(name:"affected", value:"'zlib' package(s) on Ubuntu 16.04.");

  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 == "UBUNTU16.04 LTS") {

  if(!isnull(res = isdpkgvuln(pkg:"lib32z1", ver:"1:1.2.8.dfsg-2ubuntu4.3", rls:"UBUNTU16.04 LTS"))) {
    report += res;
  }

  if(!isnull(res = isdpkgvuln(pkg:"lib64z1", ver:"1:1.2.8.dfsg-2ubuntu4.3", rls:"UBUNTU16.04 LTS"))) {
    report += res;
  }

  if(!isnull(res = isdpkgvuln(pkg:"libx32z1", ver:"1:1.2.8.dfsg-2ubuntu4.3", rls:"UBUNTU16.04 LTS"))) {
    report += res;
  }

  if(!isnull(res = isdpkgvuln(pkg:"zlib1g", ver:"1:1.2.8.dfsg-2ubuntu4.3", rls:"UBUNTU16.04 LTS"))) {
    report += res;
  }

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

exit(0);