Ubuntu 14.04 LTS / 16.04 LTS / 18.04 LTS / 20.04 LTS / 24.04 LTS / 26.04 LTS : curl vulnerabilities (USN-8525-1)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-8525-1. The text
# itself is copyright (C) Canonical, Inc. See
# <https://ubuntu.com/security/notices>. Ubuntu(R) is a registered
# trademark of Canonical, Inc.
##

include('compat.inc');

if (description)
{
  script_id(326253);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/07/10");

  script_cve_id(
    "CVE-2024-8096",
    "CVE-2024-11053",
    "CVE-2026-5545",
    "CVE-2026-5773",
    "CVE-2026-7168",
    "CVE-2026-10536",
    "CVE-2026-11352",
    "CVE-2026-11564",
    "CVE-2026-11586",
    "CVE-2026-12064"
  );
  script_xref(name:"IAVA", value:"2024-A-0571-S");
  script_xref(name:"IAVA", value:"2024-A-0794-S");
  script_xref(name:"IAVA", value:"2026-A-0397-S");
  script_xref(name:"IAVA", value:"2026-A-0627");
  script_xref(name:"USN", value:"8525-1");

  script_name(english:"Ubuntu 14.04 LTS / 16.04 LTS / 18.04 LTS / 20.04 LTS / 24.04 LTS / 26.04 LTS : curl vulnerabilities (USN-8525-1)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Ubuntu host is missing one or more security updates.");
  script_set_attribute(attribute:"description", value:
"The remote Ubuntu 14.04 LTS / 16.04 LTS / 18.04 LTS / 20.04 LTS / 24.04 LTS / 26.04 LTS host has packages installed that
are affected by multiple vulnerabilities as referenced in the USN-8525-1 advisory.

    Harry Sintonen discovered that curl incorrectly handled credentials when following HTTP redirects in
    conjunction with .netrc files. An attacker could possibly use this issue to obtain sensitive information.
    This issue only affected Ubuntu 14.04 LTS, Ubuntu 16.04 LTS, and Ubuntu 18.04 LTS. (CVE-2024-11053)

    Hiroki Kurosawa discovered that curl incorrectly handled OCSP stapling responses. A remote attacker could
    possibly use this issue to obtain sensitive information. This issue only affected Ubuntu 16.04 LTS and
    Ubuntu 18.04 LTS. (CVE-2024-8096)

    Joshua Rogers discovered that curl had a use-after-free vulnerability when resetting and cleaning up
    HTTP/2 stream handles. An attacker could possibly use this issue to cause a denial of service or execute
    arbitrary code. This issue only affected Ubuntu 24.04 LTS, Ubuntu 25.04, and Ubuntu 25.10.
    (CVE-2026-10536)

    Quac Tran and Ngoc Hieu discovered that curl incorrectly reused connections when switching authentication
    methods to the same host. An attacker could possibly use this issue to obtain sensitive information or
    perform unauthorized actions. This issue only affected Ubuntu 20.04 LTS. (CVE-2026-5545)

    Osama Hamad discovered that curl incorrectly reused SMB connections when the target share differed between
    transfers. An attacker could possibly use this issue to obtain sensitive information. This issue only
    affected Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, and Ubuntu 20.04 LTS. (CVE-2026-5773)

    Muhamad Arga Reksapati discovered that curl incorrectly forwarded Digest proxy authentication credentials
    to a different proxy host. An attacker could possibly use this issue to obtain sensitive information. This
    issue only affected Ubuntu 18.04 LTS and Ubuntu 20.04 LTS. (CVE-2026-7168)

    It was discovered that curl incorrectly skipped SSH host verification options when using schemeless URLs
    with --proto-default. An attacker could possibly use this issue to perform machine-in-the-middle attacks.
    This issue only affected Ubuntu 25.04 and Ubuntu 25.10. (CVE-2026-12064)

    It was discovered that curl did not enforce an upper bound on memory allocated for unacknowledged
    WebSocket PING frames. A remote attacker could possibly use this issue to cause a denial of service. This
    issue only affected Ubuntu 25.10. (CVE-2026-11586)

    It was discovered that curl could stall indefinitely when a malicious HTTP/3 server sent a continuous
    stream of empty UDP datagrams. A remote attacker could possibly use this issue to cause a denial of
    service. This issue only affected Ubuntu 25.10. (CVE-2026-11352)

    It was discovered that curl could incorrectly continue trusting a native platform CA store after an
    application switched the handle to use custom CA material. An attacker could possibly use this issue to
    obtain sensitive information. This issue only affected Ubuntu 25.10. (CVE-2026-11564)

Tenable has extracted the preceding description block directly from the Ubuntu 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://ubuntu.com/security/notices/USN-8525-1");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:C/I:N/A:N");
  script_set_cvss_temporal_vector("CVSS2#E:POC/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-5773");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2023/12/12");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/07/09");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/07/10");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:14.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:16.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:18.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:20.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:24.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:26.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:curl");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libcurl3");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libcurl3-gnutls");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libcurl3-nss");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libcurl3t64-gnutls");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libcurl4");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libcurl4-gnutls-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libcurl4-nss-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libcurl4-openssl-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libcurl4t64");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_set_attribute(attribute:"stig_severity", value:"I");
  script_end_attributes();

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

  script_copyright(english:"Ubuntu Security Notice (C) 2026 Canonical, Inc. / NASL script (C) 2026 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info.nasl", "ubuntu_pro_sub_detect.nasl");
  script_require_keys("Host/cpu", "Host/Ubuntu", "Host/Ubuntu/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);
var os_release = get_kb_item('Host/Ubuntu/release');
if ( isnull(os_release) ) audit(AUDIT_OS_NOT, 'Ubuntu');
os_release = chomp(os_release);
if (! ('14.04' >< os_release || '16.04' >< os_release || '18.04' >< os_release || '20.04' >< os_release || '24.04' >< os_release || '26.04' >< os_release)) audit(AUDIT_OS_NOT, 'Ubuntu 14.04 / 16.04 / 18.04 / 20.04 / 24.04 / 26.04', 'Ubuntu ' + os_release);
if ( ! get_kb_item('Host/Debian/dpkg-l') ) audit(AUDIT_PACKAGE_LIST_MISSING);

var cpu = get_kb_item('Host/cpu');
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ('x86_64' >!< cpu && cpu !~ "^i[3-6]86$" && 's390' >!< cpu && 'aarch64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'Ubuntu', cpu);
var ubuntu_pro_detected = get_kb_item('Host/Ubuntu/Pro/Services/esm-apps');
ubuntu_pro_detected = !empty_or_null(ubuntu_pro_detected);

var pro_caveat_needed = FALSE;

var pkgs = [
    {'osver': '14.04', 'pkgname': 'curl', 'pkgver': '7.35.0-1ubuntu2.20+esm21', 'ubuntu_pro': TRUE, 'cves': ['CVE-2024-11053']},
    {'osver': '14.04', 'pkgname': 'libcurl3', 'pkgver': '7.35.0-1ubuntu2.20+esm21', 'ubuntu_pro': TRUE, 'cves': ['CVE-2024-11053']},
    {'osver': '14.04', 'pkgname': 'libcurl3-gnutls', 'pkgver': '7.35.0-1ubuntu2.20+esm21', 'ubuntu_pro': TRUE, 'cves': ['CVE-2024-11053']},
    {'osver': '14.04', 'pkgname': 'libcurl3-nss', 'pkgver': '7.35.0-1ubuntu2.20+esm21', 'ubuntu_pro': TRUE, 'cves': ['CVE-2024-11053']},
    {'osver': '14.04', 'pkgname': 'libcurl4-gnutls-dev', 'pkgver': '7.35.0-1ubuntu2.20+esm21', 'ubuntu_pro': TRUE, 'cves': ['CVE-2024-11053']},
    {'osver': '14.04', 'pkgname': 'libcurl4-nss-dev', 'pkgver': '7.35.0-1ubuntu2.20+esm21', 'ubuntu_pro': TRUE, 'cves': ['CVE-2024-11053']},
    {'osver': '14.04', 'pkgname': 'libcurl4-openssl-dev', 'pkgver': '7.35.0-1ubuntu2.20+esm21', 'ubuntu_pro': TRUE, 'cves': ['CVE-2024-11053']},
    {'osver': '16.04', 'pkgname': 'curl', 'pkgver': '7.47.0-1ubuntu2.19+esm17', 'ubuntu_pro': TRUE, 'cves': ['CVE-2024-8096', 'CVE-2024-11053', 'CVE-2026-5773']},
    {'osver': '16.04', 'pkgname': 'libcurl3', 'pkgver': '7.47.0-1ubuntu2.19+esm17', 'ubuntu_pro': TRUE, 'cves': ['CVE-2024-8096', 'CVE-2024-11053', 'CVE-2026-5773']},
    {'osver': '16.04', 'pkgname': 'libcurl3-gnutls', 'pkgver': '7.47.0-1ubuntu2.19+esm17', 'ubuntu_pro': TRUE, 'cves': ['CVE-2024-8096', 'CVE-2024-11053', 'CVE-2026-5773']},
    {'osver': '16.04', 'pkgname': 'libcurl3-nss', 'pkgver': '7.47.0-1ubuntu2.19+esm17', 'ubuntu_pro': TRUE, 'cves': ['CVE-2024-8096', 'CVE-2024-11053', 'CVE-2026-5773']},
    {'osver': '16.04', 'pkgname': 'libcurl4-gnutls-dev', 'pkgver': '7.47.0-1ubuntu2.19+esm17', 'ubuntu_pro': TRUE, 'cves': ['CVE-2024-8096', 'CVE-2024-11053', 'CVE-2026-5773']},
    {'osver': '16.04', 'pkgname': 'libcurl4-nss-dev', 'pkgver': '7.47.0-1ubuntu2.19+esm17', 'ubuntu_pro': TRUE, 'cves': ['CVE-2024-8096', 'CVE-2024-11053', 'CVE-2026-5773']},
    {'osver': '16.04', 'pkgname': 'libcurl4-openssl-dev', 'pkgver': '7.47.0-1ubuntu2.19+esm17', 'ubuntu_pro': TRUE, 'cves': ['CVE-2024-8096', 'CVE-2024-11053', 'CVE-2026-5773']},
    {'osver': '18.04', 'pkgname': 'curl', 'pkgver': '7.58.0-2ubuntu3.24+esm10', 'ubuntu_pro': TRUE, 'cves': ['CVE-2024-8096', 'CVE-2024-11053', 'CVE-2026-5773', 'CVE-2026-7168']},
    {'osver': '18.04', 'pkgname': 'libcurl3-gnutls', 'pkgver': '7.58.0-2ubuntu3.24+esm10', 'ubuntu_pro': TRUE, 'cves': ['CVE-2024-8096', 'CVE-2024-11053', 'CVE-2026-5773', 'CVE-2026-7168']},
    {'osver': '18.04', 'pkgname': 'libcurl3-nss', 'pkgver': '7.58.0-2ubuntu3.24+esm10', 'ubuntu_pro': TRUE, 'cves': ['CVE-2024-8096', 'CVE-2024-11053', 'CVE-2026-5773', 'CVE-2026-7168']},
    {'osver': '18.04', 'pkgname': 'libcurl4', 'pkgver': '7.58.0-2ubuntu3.24+esm10', 'ubuntu_pro': TRUE, 'cves': ['CVE-2024-8096', 'CVE-2024-11053', 'CVE-2026-5773', 'CVE-2026-7168']},
    {'osver': '18.04', 'pkgname': 'libcurl4-gnutls-dev', 'pkgver': '7.58.0-2ubuntu3.24+esm10', 'ubuntu_pro': TRUE, 'cves': ['CVE-2024-8096', 'CVE-2024-11053', 'CVE-2026-5773', 'CVE-2026-7168']},
    {'osver': '18.04', 'pkgname': 'libcurl4-nss-dev', 'pkgver': '7.58.0-2ubuntu3.24+esm10', 'ubuntu_pro': TRUE, 'cves': ['CVE-2024-8096', 'CVE-2024-11053', 'CVE-2026-5773', 'CVE-2026-7168']},
    {'osver': '18.04', 'pkgname': 'libcurl4-openssl-dev', 'pkgver': '7.58.0-2ubuntu3.24+esm10', 'ubuntu_pro': TRUE, 'cves': ['CVE-2024-8096', 'CVE-2024-11053', 'CVE-2026-5773', 'CVE-2026-7168']},
    {'osver': '20.04', 'pkgname': 'curl', 'pkgver': '7.68.0-1ubuntu2.25+esm5', 'ubuntu_pro': TRUE, 'cves': ['CVE-2026-5545', 'CVE-2026-5773', 'CVE-2026-7168']},
    {'osver': '20.04', 'pkgname': 'libcurl3-gnutls', 'pkgver': '7.68.0-1ubuntu2.25+esm5', 'ubuntu_pro': TRUE, 'cves': ['CVE-2026-5545', 'CVE-2026-5773', 'CVE-2026-7168']},
    {'osver': '20.04', 'pkgname': 'libcurl3-nss', 'pkgver': '7.68.0-1ubuntu2.25+esm5', 'ubuntu_pro': TRUE, 'cves': ['CVE-2026-5545', 'CVE-2026-5773', 'CVE-2026-7168']},
    {'osver': '20.04', 'pkgname': 'libcurl4', 'pkgver': '7.68.0-1ubuntu2.25+esm5', 'ubuntu_pro': TRUE, 'cves': ['CVE-2026-5545', 'CVE-2026-5773', 'CVE-2026-7168']},
    {'osver': '20.04', 'pkgname': 'libcurl4-gnutls-dev', 'pkgver': '7.68.0-1ubuntu2.25+esm5', 'ubuntu_pro': TRUE, 'cves': ['CVE-2026-5545', 'CVE-2026-5773', 'CVE-2026-7168']},
    {'osver': '20.04', 'pkgname': 'libcurl4-nss-dev', 'pkgver': '7.68.0-1ubuntu2.25+esm5', 'ubuntu_pro': TRUE, 'cves': ['CVE-2026-5545', 'CVE-2026-5773', 'CVE-2026-7168']},
    {'osver': '20.04', 'pkgname': 'libcurl4-openssl-dev', 'pkgver': '7.68.0-1ubuntu2.25+esm5', 'ubuntu_pro': TRUE, 'cves': ['CVE-2026-5545', 'CVE-2026-5773', 'CVE-2026-7168']},
    {'osver': '24.04', 'pkgname': 'curl', 'pkgver': '8.5.0-2ubuntu10.11', 'ubuntu_pro': FALSE, 'cves': ['CVE-2026-10536']},
    {'osver': '24.04', 'pkgname': 'libcurl3t64-gnutls', 'pkgver': '8.5.0-2ubuntu10.11', 'ubuntu_pro': FALSE, 'cves': ['CVE-2026-10536']},
    {'osver': '24.04', 'pkgname': 'libcurl4-gnutls-dev', 'pkgver': '8.5.0-2ubuntu10.11', 'ubuntu_pro': FALSE, 'cves': ['CVE-2026-10536']},
    {'osver': '24.04', 'pkgname': 'libcurl4-openssl-dev', 'pkgver': '8.5.0-2ubuntu10.11', 'ubuntu_pro': FALSE, 'cves': ['CVE-2026-10536']},
    {'osver': '24.04', 'pkgname': 'libcurl4t64', 'pkgver': '8.5.0-2ubuntu10.11', 'ubuntu_pro': FALSE, 'cves': ['CVE-2026-10536']},
    {'osver': '26.04', 'pkgname': 'curl', 'pkgver': '8.18.0-1ubuntu2.3', 'ubuntu_pro': FALSE},
    {'osver': '26.04', 'pkgname': 'libcurl3t64-gnutls', 'pkgver': '8.18.0-1ubuntu2.3', 'ubuntu_pro': FALSE},
    {'osver': '26.04', 'pkgname': 'libcurl4-gnutls-dev', 'pkgver': '8.18.0-1ubuntu2.3', 'ubuntu_pro': FALSE},
    {'osver': '26.04', 'pkgname': 'libcurl4-openssl-dev', 'pkgver': '8.18.0-1ubuntu2.3', 'ubuntu_pro': FALSE},
    {'osver': '26.04', 'pkgname': 'libcurl4t64', 'pkgver': '8.18.0-1ubuntu2.3', 'ubuntu_pro': FALSE}
];

var flag = 0;
foreach var package_array ( pkgs ) {
  var osver = NULL;
  var pkgname = NULL;
  var pkgver = NULL;
  if (!empty_or_null(package_array['osver'])) osver = package_array['osver'];
  if (!empty_or_null(package_array['pkgname'])) pkgname = package_array['pkgname'];
  if (!empty_or_null(package_array['pkgver'])) pkgver = package_array['pkgver'];
  if (!empty_or_null(package_array['cves'])) cves = package_array['cves'];
  var pro_required = NULL;
  if (!empty_or_null(package_array['ubuntu_pro'])) pro_required = package_array['ubuntu_pro'];
  if (osver && pkgname && pkgver) {
    if (deb_check(release:osver, prefix:pkgname, reference:pkgver, cves:cves)) {
        flag++;
        if (!ubuntu_pro_detected && !pro_caveat_needed) pro_caveat_needed = pro_required;
    }
  }
}

if (flag)
{
  var extra = '';
  if (pro_caveat_needed) {
    extra += 'NOTE: This vulnerability check contains fixes that apply to packages only \n';
    extra += 'available in Ubuntu ESM repositories. Access to these package security updates \n';
    extra += 'require an Ubuntu Pro subscription.\n\n';
  }
  extra += ubuntu_report_get();
  security_report_v4(
    port       : 0,
    severity   : SECURITY_HOLE,
    extra      : extra
  );
  exit(0);
}
else
{
  var tested = ubuntu_pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'curl / libcurl3 / libcurl3-gnutls / libcurl3-nss / etc');
}