Ubuntu: Security Advisory (USN-4247-2)

# 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("1.3.6.1.4.1.25623.1.0.844306");
  script_cve_id("CVE-2019-15795", "CVE-2019-15796");
  script_tag(name:"creation_date", value:"2020-01-23 04:00:32 +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:"2.6");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:H/Au:N/C:N/I:P/A:N");
  script_tag(name:"severity_vector", value:"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N");
  script_tag(name:"severity_origin", value:"NVD");
  script_tag(name:"severity_date", value:"2020-04-08 15:53:46 +0000 (Wed, 08 Apr 2020)");

  script_name("Ubuntu: Security Advisory (USN-4247-2)");
  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=UBUNTU(16\.04\ LTS|18\.04\ LTS|19\.04|19\.10)");

  script_xref(name:"Advisory-ID", value:"USN-4247-2");
  script_xref(name:"URL", value:"https://ubuntu.com/security/notices/USN-4247-2");
  script_xref(name:"URL", value:"https://launchpad.net/bugs/1860606");

  script_tag(name:"summary", value:"The remote host is missing an update for the 'python-apt' package(s) announced via the USN-4247-2 advisory.");

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

  script_tag(name:"insight", value:"USN-4247-1 fixed vulnerabilities in python-apt. The updated packages caused
a regression when attempting to upgrade to a new Ubuntu release. This
update fixes the problem.

We apologize for the inconvenience.

Original advisory details:

 It was discovered that python-apt would still use MD5 hashes to validate
 certain downloaded packages. If a remote attacker were able to perform a
 machine-in-the-middle attack, this flaw could potentially be used to install
 altered packages. (CVE-2019-15795)

 It was discovered that python-apt could install packages from untrusted
 repositories, contrary to expectations. (CVE-2019-15796)");

  script_tag(name:"affected", value:"'python-apt' package(s) on Ubuntu 16.04, Ubuntu 18.04, Ubuntu 19.04, Ubuntu 19.10.");

  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 == "UBUNTU16.04 LTS") {

  if(!isnull(res = isdpkgvuln(pkg:"python-apt", ver:"1.1.0~beta1ubuntu0.16.04.8", rls:"UBUNTU16.04 LTS"))) {
    report += res;
  }

  if(!isnull(res = isdpkgvuln(pkg:"python3-apt", ver:"1.1.0~beta1ubuntu0.16.04.8", rls:"UBUNTU16.04 LTS"))) {
    report += res;
  }

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

if(release == "UBUNTU18.04 LTS") {

  if(!isnull(res = isdpkgvuln(pkg:"python-apt", ver:"1.6.5ubuntu0.2", rls:"UBUNTU18.04 LTS"))) {
    report += res;
  }

  if(!isnull(res = isdpkgvuln(pkg:"python3-apt", ver:"1.6.5ubuntu0.2", rls:"UBUNTU18.04 LTS"))) {
    report += res;
  }

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

if(release == "UBUNTU19.04") {

  if(!isnull(res = isdpkgvuln(pkg:"python-apt", ver:"1.8.5~ubuntu0.3", rls:"UBUNTU19.04"))) {
    report += res;
  }

  if(!isnull(res = isdpkgvuln(pkg:"python3-apt", ver:"1.8.5~ubuntu0.3", rls:"UBUNTU19.04"))) {
    report += res;
  }

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

if(release == "UBUNTU19.10") {

  if(!isnull(res = isdpkgvuln(pkg:"python-apt", ver:"1.9.0ubuntu1.3", rls:"UBUNTU19.10"))) {
    report += res;
  }

  if(!isnull(res = isdpkgvuln(pkg:"python3-apt", ver:"1.9.0ubuntu1.3", rls:"UBUNTU19.10"))) {
    report += res;
  }

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

exit(0);