Atlassian Confluence 9.1.x < 9.2.26 / 9.3.x < 10.2.19 / 11.0.0 (CONFSERVER-104515)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
##

include('compat.inc');

if (description)
{
  script_id(368968);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/10/21");

  script_cve_id("CVE-2026-68495");

  script_name(english:"Atlassian Confluence 9.1.x < 9.2.26 / 9.3.x < 10.2.19 / 11.0.0 (CONFSERVER-104515)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Atlassian Confluence host is missing a security update.");
  script_set_attribute(attribute:"description", value:
"The version of Atlassian Confluence Server running on the remote host is affected by a vulnerability as referenced in
the CONFSERVER-104515 advisory.

  - The CBOR parser in FasterXML jackson-dataformats-binary never invokes
    StreamReadConstraints.validateNameLength() when decoding JSON object property names, so the maxNameLength
    limit is not enforced for this format. CBORParser._decodeLongerName() decodes a definite-length property
    name with no length check, and CBORParser._decodeChunkedName() delegates to the value-oriented
    _finishChunkedText() routine, which validates maxStringLength rather than maxNameLength. An attacker who
    can have a CBOR document parsed may therefore embed a single property name of unbounded length; the parser
    buffers the whole name in memory before returning it, whatever maxNameLength is configured to. Because
    StreamReadConstraints.maxDocumentLength is also disabled by default, nothing else bounds the name under
    default settings, so the only limits are the attacker's upload capacity and available heap, leading to
    memory exhaustion and denial of service. No privileges beyond the ability to submit data to a parsing
    endpoint are required, and exploitation needs only that the bytes reach CBORFactory parsing, directly or
    through an ObjectMapper configured with the CBOR module. jackson-core's own JSON parsers enforce
    maxNameLength incrementally during name decoding; this gap is specific to the binary formats.
    maxNameLength and validateNameLength were introduced in jackson-core 2.16.0, so releases before 2.16.0 do
    not contain the constraint that is left unenforced. This issue is tracked together with the Smile parser
    defect in the same vendor advisory, GHSA-3v8f-v6vx-fmrm, which covers both binary formats. The CBOR parser
    defect (jackson-dataformats-binary issue #725) is CVE-2026-68495; the Smile parser defect (issue #726) is
    assigned CVE-2026-68496. (CVE-2026-68495)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version
number.");
  script_set_attribute(attribute:"see_also", value:"https://jira.atlassian.com/browse/CONFSERVER-104515");
  script_set_attribute(attribute:"solution", value:
"Upgrade to Atlassian Confluence version 9.2.26, 10.2.19, 11.0.0 or later.");
  script_set_attribute(attribute:"agent", value:"all");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:N/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:N/UI:N/S:U/C:N/I:N/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-2026-68495");

  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:"2026/10/01");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/10/16");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/10/21");

  script_set_attribute(attribute:"plugin_type", value:"combined");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:atlassian:confluence");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_set_attribute(attribute:"thorough_tests", value:"true");
  script_set_attribute(attribute:"enable_cgi_scanning", value:"true");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"CGI abuses");

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

  script_dependencies("confluence_detect.nasl", "confluence_nix_installed.nbin", "confluence_win_installed.nbin");
  script_require_keys("installed_sw/Atlassian Confluence");

  exit(0);
}

include('vdf.inc');

# @tvdl-content-verify-only
var vuln_data = {
  "metadata": {
    "spec_version": "1.0"
  },
  "checks": [
    {
      "product": {
        "name": "Atlassian Confluence",
        "type": "app"
      },
      "check_algorithm": "default",
      "constraints": [
        {
          "min_version": "9.1.0",
          "fixed_version": "9.2.26",
          "fixed_display": "9.2.26 / 10.2.19 / 11.0.0"
        },
        {
          "min_version": "9.3.1",
          "fixed_version": "10.2.19",
          "fixed_display": "10.2.19 / 11.0.0"
        }
      ]
    }
  ]
};

var vdf_result = vdf::check_and_report(vuln_data:vuln_data, severity:SECURITY_HOLE);
vdf::handle_check_and_report_errors(vdf_result:vdf_result);