Ubuntu: Security Advisory (USN-4994-2)

# SPDX-FileCopyrightText: 2022 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("1.3.6.1.4.1.25623.1.1.12.2021.4994.2");
  script_cve_id("CVE-2020-35452", "CVE-2021-26690", "CVE-2021-26691", "CVE-2021-30641");
  script_tag(name:"creation_date", value:"2022-08-26 07:43:23 +0000 (Fri, 26 Aug 2022)");
  script_version("2024-02-02T05:06:10+0000");
  script_tag(name:"last_modification", value:"2024-02-02 05:06:10 +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:"2021-06-22 12:43:55 +0000 (Tue, 22 Jun 2021)");

  script_name("Ubuntu: Security Advisory (USN-4994-2)");
  script_category(ACT_GATHER_INFO);
  script_copyright("Copyright (C) 2022 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(14\.04\ LTS|16\.04\ LTS)");

  script_xref(name:"Advisory-ID", value:"USN-4994-2");
  script_xref(name:"URL", value:"https://ubuntu.com/security/notices/USN-4994-2");

  script_tag(name:"summary", value:"The remote host is missing an update for the 'apache2' package(s) announced via the USN-4994-2 advisory.");

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

  script_tag(name:"insight", value:"USN-4994-1 fixed several vulnerabilities in Apache. This update provides
the corresponding update for Ubuntu 14.04 ESM and Ubuntu 16.04 ESM.

Original advisory details:

 Antonio Morales discovered that the Apache mod_auth_digest module
 incorrectly handled certain Digest nonces. A remote attacker could possibly
 use this issue to cause Apache to crash, resulting in a denial of service.
 (CVE-2020-35452)

 Antonio Morales discovered that the Apache mod_session module incorrectly
 handled certain Cookie headers. A remote attacker could possibly use this
 issue to cause Apache to crash, resulting in a denial of service.
 (CVE-2021-26690)

 Christophe Jaillet discovered that the Apache mod_session module
 incorrectly handled certain SessionHeader values. A remote attacker could
 use this issue to cause Apache to crash, resulting in a denial of service,
 or possibly execute arbitrary code. (CVE-2021-26691)

 Christoph Anton Mitterer discovered that the new MergeSlashes configuration
 option resulted in unexpected behaviour in certain situations.
 (CVE-2021-30641)");

  script_tag(name:"affected", value:"'apache2' package(s) on Ubuntu 14.04, 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 == "UBUNTU14.04 LTS") {

  if(!isnull(res = isdpkgvuln(pkg:"apache2", ver:"2.4.7-1ubuntu4.22+esm1", rls:"UBUNTU14.04 LTS"))) {
    report += res;
  }

  if(!isnull(res = isdpkgvuln(pkg:"apache2-bin", ver:"2.4.7-1ubuntu4.22+esm1", rls:"UBUNTU14.04 LTS"))) {
    report += res;
  }

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

if(release == "UBUNTU16.04 LTS") {

  if(!isnull(res = isdpkgvuln(pkg:"apache2", ver:"2.4.18-2ubuntu3.17+esm1", rls:"UBUNTU16.04 LTS"))) {
    report += res;
  }

  if(!isnull(res = isdpkgvuln(pkg:"apache2-bin", ver:"2.4.18-2ubuntu3.17+esm1", rls:"UBUNTU16.04 LTS"))) {
    report += res;
  }

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

exit(0);