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nessusThis script is Copyright (C) 2024 and is owned by Tenable, Inc. or an Affiliate thereof.GITLAB_CVE-2023-6840.NASL
HistoryFeb 07, 2024 - 12:00 a.m.

GitLab 16.4 < 16.6.7 / 16.7 < 16.7.5 / 16.8 < 16.8.2 (CVE-2023-6840)

2024-02-0700:00:00
This script is Copyright (C) 2024 and is owned by Tenable, Inc. or an Affiliate thereof.
www.tenable.com
9
gitlab
version
vulnerability
cve-2023-6840
remote host
security policy
protected branch
maintainer

6.7 Medium

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

HIGH

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

LOW

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:H/A:H

6.3 Medium

AI Score

Confidence

High

0.0004 Low

EPSS

Percentile

15.6%

The version of GitLab installed on the remote host is affected by a vulnerability, as follows:

  • An issue has been discovered in GitLab EE affecting all versions from 16.4 prior to 16.6.7, 16.7 prior to 16.7.5, and 16.8 prior to 16.8.2 which allows a maintainer to change the name of a protected branch that bypasses the security policy added to block MR. (CVE-2023-6840)

Note that Nessus has not tested for this issue but has instead relied only on the application’s self-reported version number.

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

include('compat.inc');

if (description)
{
  script_id(190107);
  script_version("1.3");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/05/17");

  script_cve_id("CVE-2023-6840");
  script_xref(name:"IAVA", value:"2024-A-0078-S");

  script_name(english:"GitLab 16.4 < 16.6.7 / 16.7 < 16.7.5 / 16.8 < 16.8.2 (CVE-2023-6840)");

  script_set_attribute(attribute:"synopsis", value:
"The version of GitLab installed on the remote host is affected by a vulnerability.");
  script_set_attribute(attribute:"description", value:
"The version of GitLab installed on the remote host is affected by a vulnerability, as follows:

  - An issue has been discovered in GitLab EE affecting all versions from 16.4 prior to 16.6.7, 16.7 prior to
    16.7.5, and 16.8 prior to 16.8.2 which allows a maintainer to change the name of a protected branch that
    bypasses the security policy added to block MR. (CVE-2023-6840)

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://gitlab.com/gitlab-org/gitlab/-/issues/435500");
  script_set_attribute(attribute:"see_also", value:"https://hackerone.com/reports/2280292");
  # https://gitlab.com/gitlab-org/cves/-/blob/master/2023/CVE-2023-6840.json
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?5bf36cdf");
  script_set_attribute(attribute:"solution", value:
"Upgrade to GitLab version 16.6.7, 16.7.5, 16.8.2 or later.");
  script_set_attribute(attribute:"agent", value:"unix");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:M/C:P/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:H/UI:N/S:U/C:L/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-2023-6840");

  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:"2024/02/07");
  script_set_attribute(attribute:"patch_publication_date", value:"2024/02/07");
  script_set_attribute(attribute:"plugin_publication_date", value:"2024/02/07");

  script_set_attribute(attribute:"plugin_type", value:"combined");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:gitlab:gitlab");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_set_attribute(attribute:"stig_severity", value:"I");
  script_set_attribute(attribute:"thorough_tests", value:"true");
  script_end_attributes();

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

  script_copyright(english:"This script is Copyright (C) 2024 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("gitlab_webui_detect.nbin", "gitlab_nix_installed.nbin");
  script_require_keys("installed_sw/GitLab");

  exit(0);
}

include('vcf.inc');

var app = 'GitLab';
var app_info = vcf::combined_get_app_info(app:app);

if (report_paranoia < 2 && max_index(app_info.parsed_version[0]) < 3 && app_info.version =~ "^16\.(6|7|8)$")
  if (!empty_or_null(app_info.port))
    audit(AUDIT_POTENTIAL_VULN, app, app_info.version, app_info.port);
  else
    audit(AUDIT_POTENTIAL_VULN, app, app_info.version);

var constraints = [
  { 'min_version' : '16.4', 'fixed_version' : '16.6.7' },
  { 'min_version' : '16.7', 'fixed_version' : '16.7.5' },
  { 'min_version' : '16.8', 'fixed_version' : '16.8.2' }
];

vcf::check_version_and_report(
    app_info:app_info,
    constraints:constraints,
    severity:SECURITY_HOLE
);
VendorProductVersionCPE
gitlabgitlabcpe:/a:gitlab:gitlab

6.7 Medium

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

HIGH

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

LOW

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:H/A:H

6.3 Medium

AI Score

Confidence

High

0.0004 Low

EPSS

Percentile

15.6%