The remote Samba server is potentially affected by a security bypass vulnerability because of a flaw that causes all smbd processes, when libcap support is enabled, to inherit ‘CAP_DAC_OVERRIDE’ capabilities, which in turn causes all file system access to be allowed even when permissions should have been denied.
A remote, authenticated attacker may be able to exploit this flaw to gain access to sensitive information on Samba shares that are accessible to their user id.
#
# (C) Tenable Network Security, Inc.
#
include("compat.inc");
if (description)
{
script_id(45046);
script_version("1.15");
script_set_attribute(attribute:"plugin_modification_date", value:"2020/06/01");
script_cve_id("CVE-2010-0728");
script_bugtraq_id(38606);
script_name(english:"Samba 'CAP_DAC_OVERRIDE' File Permission Security Bypass (version check)");
script_summary(english:"Checks the version of Samba.");
script_set_attribute(attribute:"synopsis", value:"The remote file server is vulnerable to a security bypass attack.");
script_set_attribute(attribute:"description", value:
"The remote Samba server is potentially affected by a security bypass
vulnerability because of a flaw that causes all smbd processes, when
libcap support is enabled, to inherit 'CAP_DAC_OVERRIDE' capabilities,
which in turn causes all file system access to be allowed even when
permissions should have been denied.
A remote, authenticated attacker may be able to exploit this flaw to
gain access to sensitive information on Samba shares that are
accessible to their user id.");
script_set_attribute(attribute:"see_also", value:"https://www.samba.org/samba/security/CVE-2010-0728.html");
script_set_attribute(attribute:"see_also", value:"https://bugzilla.samba.org/show_bug.cgi?id=7222");
script_set_attribute(attribute:"see_also", value:"https://www.samba.org/samba/security/");
script_set_attribute(attribute:"solution", value:"Upgrade to Samba 3.3.12, 3.4.7, 3.5.1, or later.");
script_set_cvss_base_vector("CVSS2#AV:N/AC:M/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-2010-0728");
script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
script_set_attribute(attribute:"exploit_available", value:"false");
script_cwe_id(264);
script_set_attribute(attribute:"vuln_publication_date", value:"2010/03/09");
script_set_attribute(attribute:"patch_publication_date", value:"2010/03/09");
script_set_attribute(attribute:"plugin_publication_date", value:"2010/03/12");
script_set_attribute(attribute:"potential_vulnerability", value:"true");
script_set_attribute(attribute:"plugin_type", value:"remote");
script_set_attribute(attribute:"cpe", value:"cpe:/a:samba:samba");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_family(english:"Misc.");
script_copyright(english:"This script is Copyright (C) 2010-2020 and is owned by Tenable, Inc. or an Affiliate thereof.");
script_dependencies("smb_nativelanman.nasl");
script_require_keys("SMB/samba", "SMB/NativeLanManager", "Settings/ParanoidReport");
exit(0);
}
include("audit.inc");
include("global_settings.inc");
if (report_paranoia < 2) audit(AUDIT_PARANOID);
lanman = get_kb_item("SMB/NativeLanManager");
if (isnull(lanman)) exit(1, "The 'SMB/NativeLanManager' KB item is missing.");
if ("samba " >!< tolower(lanman)) exit(0, "The host is not using Samba.");
# nb: the vulnerability was introduced in 3.5.0 / 3.4.6 / 3.3.11 - only
# those versions are affected.
if (
ereg(pattern:"Samba 3\.(3\.11|4\.6|)($|[^[0-9])", string:lanman, icase:TRUE) ||
ereg(pattern:"Samba 3\.5([^\.0-9]|\.0|$)", string:lanman, icase:TRUE)
)
{
if (report_verbosity > 0)
{
report =
'\n' +
'The remote Samba server appears to be :\n' +
'\n' +
' ' + lanman + '\n';
security_hole(port:get_kb_item("SMB/transport"),extra:report);
}
else security_hole(port:get_kb_item("SMB/transport"));
exit(0);
}
exit(0, "The host is not affected because " + lanman + " is installed.");