Debian dla-4515 : asterisk - security update

#%NASL_MIN_LEVEL 80900
#
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Debian Security Advisory dla-4515. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#

include('compat.inc');

if (description)
{
  script_id(304310);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/03/30");

  script_cve_id(
    "CVE-2026-23738",
    "CVE-2026-23739",
    "CVE-2026-23740",
    "CVE-2026-23741"
  );

  script_name(english:"Debian dla-4515 : asterisk - security update");

  script_set_attribute(attribute:"synopsis", value:
"The remote Debian host is missing one or more security-related updates.");
  script_set_attribute(attribute:"description", value:
"The remote Debian 11 host has packages installed that are affected by multiple vulnerabilities as referenced in the
dla-4515 advisory.

    -------------------------------------------------------------------------
    Debian LTS Advisory DLA-4515-1                [email protected]
    https://www.debian.org/lts/security/                       Lukas Mrdian
    March 29, 2026                                https://wiki.debian.org/LTS
    -------------------------------------------------------------------------

    Package        : asterisk
    Version        : 1:16.28.0~dfsg-0+deb11u9
    CVE ID         : CVE-2026-23738 CVE-2026-23739 CVE-2026-23740 CVE-2026-23741
    Debian Bug     : 1127438

    Multiple vulnerabilities were discovered in asterisk, an Open Source Private
    Branch Exchange (PBX) and telephony toolkit.

    CVE-2026-23738

        XSS vulnerability in the /httpstatus page. Cookie names/values and GET
        parameter names/values are rendered without HTML-escaping, allowing
        reflected cross-site scripting attacks. The status page is now also
        disabled by default.

    CVE-2026-23739

        XXE injection vulnerability in xml.c. The XML parsing functions allow
        external entity processing which can be exploited for XML External Entity
        injection attacks via network-based entity resolution.

    CVE-2026-23740

        Privilege escalation via ast_coredumper gdbinit file permissions. The
        script creates temporary files with default umask permissions, potentially
        allowing local users to read or tamper with sensitive debugging data.

    CVE-2026-23741

        Privilege escalation via ast_coredumper sourcing configuration files
        without ownership or permission checks. When running as root, a non-root
        user could place a malicious config file that gets sourced with root
        privileges.

    For Debian 11 bullseye, these problems have been fixed in version
    1:16.28.0~dfsg-0+deb11u9.

    We recommend that you upgrade your asterisk packages.

    For the detailed security status of asterisk please refer to
    its security tracker page at:
    https://security-tracker.debian.org/tracker/asterisk

    Further information about Debian LTS security advisories, how to apply
    these updates to your system and frequently asked questions can be
    found at: https://wiki.debian.org/LTS
    Attachment:
    signature.asc
    Description: PGP signature

Tenable has extracted the preceding description block directly from the Debian security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version
number.");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/source-package/asterisk");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-23738");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-23739");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-23740");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-23741");
  script_set_attribute(attribute:"see_also", value:"https://packages.debian.org/source/bullseye/asterisk");
  script_set_attribute(attribute:"solution", value:
"Upgrade the asterisk packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:S/C:C/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-23741");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/02/06");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/03/29");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/03/30");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:asterisk");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:asterisk-config");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:asterisk-dahdi");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:asterisk-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:asterisk-doc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:asterisk-mobile");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:asterisk-modules");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:asterisk-mp3");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:asterisk-mysql");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:asterisk-ooh323");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:asterisk-tests");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:asterisk-voicemail");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:asterisk-voicemail-imapstorage");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:asterisk-voicemail-odbcstorage");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:asterisk-vpb");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:11.0");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Debian Local Security Checks");

  script_copyright(english:"This script is Copyright (C) 2026 and is owned by Tenable, Inc. or an Affiliate thereof.");

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

  exit(0);
}

include('debian_package.inc');

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

var debian_release = get_kb_item('Host/Debian/release');
if ( isnull(debian_release) ) audit(AUDIT_OS_NOT, 'Debian');
debian_release = chomp(debian_release);
if (! preg(pattern:"^(11)\.[0-9]+", string:debian_release)) audit(AUDIT_OS_NOT, 'Debian 11.0', 'Debian ' + debian_release);
var cpu = get_kb_item('Host/cpu');
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ('x86_64' >!< cpu && cpu !~ "^i[3-6]86$" && 'aarch64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'Debian', cpu);

var pkgs = [
    {'release': '11.0', 'prefix': 'asterisk', 'reference': '1:16.28.0~dfsg-0+deb11u9'},
    {'release': '11.0', 'prefix': 'asterisk-config', 'reference': '1:16.28.0~dfsg-0+deb11u9'},
    {'release': '11.0', 'prefix': 'asterisk-dahdi', 'reference': '1:16.28.0~dfsg-0+deb11u9'},
    {'release': '11.0', 'prefix': 'asterisk-dev', 'reference': '1:16.28.0~dfsg-0+deb11u9'},
    {'release': '11.0', 'prefix': 'asterisk-doc', 'reference': '1:16.28.0~dfsg-0+deb11u9'},
    {'release': '11.0', 'prefix': 'asterisk-mobile', 'reference': '1:16.28.0~dfsg-0+deb11u9'},
    {'release': '11.0', 'prefix': 'asterisk-modules', 'reference': '1:16.28.0~dfsg-0+deb11u9'},
    {'release': '11.0', 'prefix': 'asterisk-mp3', 'reference': '1:16.28.0~dfsg-0+deb11u9'},
    {'release': '11.0', 'prefix': 'asterisk-mysql', 'reference': '1:16.28.0~dfsg-0+deb11u9'},
    {'release': '11.0', 'prefix': 'asterisk-ooh323', 'reference': '1:16.28.0~dfsg-0+deb11u9'},
    {'release': '11.0', 'prefix': 'asterisk-tests', 'reference': '1:16.28.0~dfsg-0+deb11u9'},
    {'release': '11.0', 'prefix': 'asterisk-voicemail', 'reference': '1:16.28.0~dfsg-0+deb11u9'},
    {'release': '11.0', 'prefix': 'asterisk-voicemail-imapstorage', 'reference': '1:16.28.0~dfsg-0+deb11u9'},
    {'release': '11.0', 'prefix': 'asterisk-voicemail-odbcstorage', 'reference': '1:16.28.0~dfsg-0+deb11u9'},
    {'release': '11.0', 'prefix': 'asterisk-vpb', 'reference': '1:16.28.0~dfsg-0+deb11u9'}
];

var flag = 0;
foreach package_array ( pkgs ) {
  var _release = NULL;
  var prefix = NULL;
  var reference = NULL;
  if (!empty_or_null(package_array['release'])) _release = package_array['release'];
  if (!empty_or_null(package_array['prefix'])) prefix = package_array['prefix'];
  if (!empty_or_null(package_array['reference'])) reference = package_array['reference'];
  if (_release && prefix && reference) {
    if (deb_check(release:_release, prefix:prefix, reference:reference)) flag++;
  }
}

if (flag)
{
  security_report_v4(
    port       : 0,
    severity   : SECURITY_HOLE,
    extra      : deb_report_get()
  );
  exit(0);
}
else
{
  var tested = deb_pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'asterisk / asterisk-config / asterisk-dahdi / asterisk-dev / etc');
}