Debian DSA-4422-1 : apache2 - security update

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were  
# extracted from Debian Security Advisory DSA-4422. The text 
# itself is copyright (C) Software in the Public Interest, Inc.
#

include("compat.inc");

if (description)
{
  script_id(123691);
  script_version("1.9");
  script_set_attribute(attribute:"plugin_modification_date", value:"2022/12/06");

  script_cve_id("CVE-2018-17189", "CVE-2018-17199", "CVE-2019-0196", "CVE-2019-0211", "CVE-2019-0217", "CVE-2019-0220");
  script_xref(name:"DSA", value:"4422");
  script_xref(name:"CISA-KNOWN-EXPLOITED", value:"2022/05/03");
  script_xref(name:"CEA-ID", value:"CEA-2019-0203");

  script_name(english:"Debian DSA-4422-1 : apache2 - security update");
  script_summary(english:"Checks dpkg output for the updated package");

  script_set_attribute(
    attribute:"synopsis",
    value:"The remote Debian host is missing a security-related update."
  );
  script_set_attribute(
    attribute:"description",
    value:
"Several vulnerabilities have been found in the Apache HTTP server.

  - CVE-2018-17189
    Gal Goldshtein of F5 Networks discovered a denial of
    service vulnerability in mod_http2. By sending malformed
    requests, the http/2 stream for that request
    unnecessarily occupied a server thread cleaning up
    incoming data, resulting in denial of service.

  - CVE-2018-17199
    Diego Angulo from ImExHS discovered that
    mod_session_cookie does not respect expiry time.

  - CVE-2019-0196
    Craig Young discovered that the http/2 request handling
    in mod_http2 could be made to access freed memory in
    string comparison when determining the method of a
    request and thus process the request incorrectly.

  - CVE-2019-0211
    Charles Fol discovered a privilege escalation from the
    less-privileged child process to the parent process
    running as root.

  - CVE-2019-0217
    A race condition in mod_auth_digest when running in a
    threaded server could allow a user with valid
    credentials to authenticate using another username,
    bypassing configured access control restrictions. The
    issue was discovered by Simon Kappel.

  - CVE-2019-0220
    Bernhard Lorenz of Alpha Strike Labs GmbH reported that
    URL normalizations were inconsistently handled. When the
    path component of a request URL contains multiple
    consecutive slashes ('/'), directives such as
    LocationMatch and RewriteRule must account for
    duplicates in regular expressions while other aspects of
    the servers processing will implicitly collapse them."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=920302"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=920303"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://security-tracker.debian.org/tracker/CVE-2018-17189"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://security-tracker.debian.org/tracker/CVE-2018-17199"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://security-tracker.debian.org/tracker/CVE-2019-0196"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://security-tracker.debian.org/tracker/CVE-2019-0211"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://security-tracker.debian.org/tracker/CVE-2019-0217"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://security-tracker.debian.org/tracker/CVE-2019-0220"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://security-tracker.debian.org/tracker/source-package/apache2"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://packages.debian.org/source/stretch/apache2"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://www.debian.org/security/2019/dsa-4422"
  );
  script_set_attribute(
    attribute:"solution",
    value:
"Upgrade the apache2 packages.

For the stable distribution (stretch), these problems have been fixed
in version 2.4.25-3+deb9u7.

This update also contains bug fixes that were scheduled for inclusion
in the next stable point release. This includes a fix for a regression
caused by a security fix in version 2.4.25-3+deb9u6."
  );
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:H/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:H/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2019-0211");
  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:apache2");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:9.0");

  script_set_attribute(attribute:"vuln_publication_date", value:"2019/01/30");
  script_set_attribute(attribute:"patch_publication_date", value:"2019/04/03");
  script_set_attribute(attribute:"plugin_publication_date", value:"2019/04/04");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2019-2022 and is owned by Tenable, Inc. or an Affiliate thereof.");
  script_family(english:"Debian Local Security Checks");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/Debian/release", "Host/Debian/dpkg-l");

  exit(0);
}


include("audit.inc");
include("debian_package.inc");


if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
if (!get_kb_item("Host/Debian/release")) audit(AUDIT_OS_NOT, "Debian");
if (!get_kb_item("Host/Debian/dpkg-l")) audit(AUDIT_PACKAGE_LIST_MISSING);


flag = 0;
if (deb_check(release:"9.0", prefix:"apache2", reference:"2.4.25-3+deb9u7")) flag++;
if (deb_check(release:"9.0", prefix:"apache2-bin", reference:"2.4.25-3+deb9u7")) flag++;
if (deb_check(release:"9.0", prefix:"apache2-data", reference:"2.4.25-3+deb9u7")) flag++;
if (deb_check(release:"9.0", prefix:"apache2-dbg", reference:"2.4.25-3+deb9u7")) flag++;
if (deb_check(release:"9.0", prefix:"apache2-dev", reference:"2.4.25-3+deb9u7")) flag++;
if (deb_check(release:"9.0", prefix:"apache2-doc", reference:"2.4.25-3+deb9u7")) flag++;
if (deb_check(release:"9.0", prefix:"apache2-ssl-dev", reference:"2.4.25-3+deb9u7")) flag++;
if (deb_check(release:"9.0", prefix:"apache2-suexec-custom", reference:"2.4.25-3+deb9u7")) flag++;
if (deb_check(release:"9.0", prefix:"apache2-suexec-pristine", reference:"2.4.25-3+deb9u7")) flag++;
if (deb_check(release:"9.0", prefix:"apache2-utils", reference:"2.4.25-3+deb9u7")) flag++;

if (flag)
{
  if (report_verbosity > 0) security_hole(port:0, extra:deb_report_get());
  else security_hole(0);
  exit(0);
}
else audit(AUDIT_HOST_NOT, "affected");