Ubuntu 22.04 LTS / 24.04 LTS / 25.10 / 26.04 LTS : rsync vulnerabilities (USN-8283-1)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-8283-1. 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(316077);
  script_version("1.3");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/05/25");

  script_cve_id(
    "CVE-2025-10158",
    "CVE-2026-29518",
    "CVE-2026-41035",
    "CVE-2026-43617",
    "CVE-2026-43618",
    "CVE-2026-43619",
    "CVE-2026-43620",
    "CVE-2026-45232"
  );
  script_xref(name:"USN", value:"8283-1");
  script_xref(name:"IAVA", value:"2026-A-0502");

  script_name(english:"Ubuntu 22.04 LTS / 24.04 LTS / 25.10 / 26.04 LTS : rsync vulnerabilities (USN-8283-1)");

  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 22.04 LTS / 24.04 LTS / 25.10 / 26.04 LTS host has a package installed that is affected by multiple
vulnerabilities as referenced in the USN-8283-1 advisory.

    Calum Hutton discovered that rsync contained a heap-based out-of-bounds read when handling file transfers.
    A remote attacker with read access to an rsync server could possibly use this issue to cause a denial of
    service. This issue only affected Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, and Ubuntu 25.10. (CVE-2025-10158)

    Batuhan Sancak, Damien Neil, and Michael Stapelberg discovered that rsync daemons configured without
    chroot protection were exposed to a race condition on parent path components. A local attacker with write
    access to a module could possibly use this issue to overwrite files, obtain sensitive information, or
    escalate privileges. (CVE-2026-29518)

    It was discovered that rsync did not properly validate a length value while sorting extended attributes.
    An attacker could possibly use this issue to cause a denial of service. (CVE-2026-41035)

    It was discovered that rsync performed reverse-DNS lookups after chrooting in some daemon configurations.
    A remote attacker could possibly use this issue to bypass hostname-based access controls and access
    network services. (CVE-2026-43617)

    Omar Elsayed discovered that rsync did not properly check for integer overflows while decoding compressed
    tokens. A remote attacker could possibly use this issue to obtain sensitive information. (CVE-2026-43618)

    Andrew Tridgell discovered that rsync did not fully fix a symlink race condition in path-based system
    calls for daemons configured without chroot protection. A local attacker could possibly use this issue to
    overwrite files, obtain sensitive information, or escalate privileges. (CVE-2026-43619)

    Pratham Gupta discovered that rsync did not properly validate an index while processing file lists. A
    remote attacker could possibly use this issue to cause rsync to crash, resulting in a denial of service.
    (CVE-2026-43620)

    Michal Ruprich discovered that rsync contained an off-by-one error while handling HTTP proxy responses. An
    attacker able to intercept network communications or a malicious proxy server could possibly use this
    issue to cause a denial of service. (CVE-2026-45232)

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-8283-1");
  script_set_attribute(attribute:"solution", value:
"Update the affected rsync package.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:S/C:C/I:N/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:POC/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss4_vector", value:"CVSS:4.0/AV:L/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N");
  script_set_attribute(attribute:"cvss4_threat_vector", value:"CVSS:4.0/E:P");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-43618");
  script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2026-41035");
  script_set_attribute(attribute:"cvss4_score_source", value:"CVE-2026-29518");

  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:"2025/11/11");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/05/20");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/05/21");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:22.04:-: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:25.10");
  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:rsync");
  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");
  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 (! ('22.04' >< os_release || '24.04' >< os_release || '25.10' >< os_release || '26.04' >< os_release)) audit(AUDIT_OS_NOT, 'Ubuntu 22.04 / 24.04 / 25.10 / 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 pkgs = [
    {'osver': '22.04', 'pkgname': 'rsync', 'pkgver': '3.2.7-0ubuntu0.22.04.6', 'cves': ['CVE-2025-10158', 'CVE-2026-29518', 'CVE-2026-41035', 'CVE-2026-43617', 'CVE-2026-43618', 'CVE-2026-43619', 'CVE-2026-43620', 'CVE-2026-45232']},
    {'osver': '24.04', 'pkgname': 'rsync', 'pkgver': '3.2.7-1ubuntu1.4', 'cves': ['CVE-2025-10158', 'CVE-2026-29518', 'CVE-2026-41035', 'CVE-2026-43617', 'CVE-2026-43618', 'CVE-2026-43619', 'CVE-2026-43620', 'CVE-2026-45232']},
    {'osver': '25.10', 'pkgname': 'rsync', 'pkgver': '3.4.1+ds1-5ubuntu1.2', 'cves': ['CVE-2025-10158', 'CVE-2026-29518', 'CVE-2026-41035', 'CVE-2026-43617', 'CVE-2026-43618', 'CVE-2026-43619', 'CVE-2026-43620', 'CVE-2026-45232']},
    {'osver': '26.04', 'pkgname': 'rsync', 'pkgver': '3.4.1+ds1-7ubuntu0.2', 'cves': ['CVE-2026-29518', 'CVE-2026-41035', 'CVE-2026-43617', 'CVE-2026-43618', 'CVE-2026-43619', 'CVE-2026-43620', 'CVE-2026-45232']}
];

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'];
  if (osver && pkgname && pkgver) {
    if (deb_check(release:osver, prefix:pkgname, reference:pkgver, cves:cves)) flag++;
  }
}

if (flag)
{
  var extra = '';
  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, 'rsync');
}