The remote SUSE Linux SLES12 / SLES_SAP12 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2023:0865-1 advisory.
A vulnerability in input validation exists in curl <8.0 during communication using the TELNET protocol may allow an attacker to pass on maliciously crafted user name and telnet options during server negotiation.
The lack of proper input scrubbing allows an attacker to send content or perform option negotiation without the application’s intent. This vulnerability could be exploited if an application allows user input, thereby enabling attackers to execute arbitrary code on the system. (CVE-2023-27533)
A path traversal vulnerability exists in curl <8.0.0 SFTP implementation causes the tilde (~) character to be wrongly replaced when used as a prefix in the first path element, in addition to its intended use as the first element to indicate a path relative to the user’s home directory. Attackers can exploit this flaw to bypass filtering or execute arbitrary code by crafting a path like /~2/foo while accessing a server with a specific user. (CVE-2023-27534)
An authentication bypass vulnerability exists in libcurl <8.0.0 in the FTP connection reuse feature that can result in wrong credentials being used during subsequent transfers. Previously created connections are kept in a connection pool for reuse if they match the current setup. However, certain FTP settings such as CURLOPT_FTP_ACCOUNT, CURLOPT_FTP_ALTERNATIVE_TO_USER, CURLOPT_FTP_SSL_CCC, and CURLOPT_USE_SSL were not included in the configuration match checks, causing them to match too easily. This could lead to libcurl using the wrong credentials when performing a transfer, potentially allowing unauthorized access to sensitive information. (CVE-2023-27535)
An authentication bypass vulnerability exists libcurl <8.0.0 in the connection reuse feature which can reuse previously established connections with incorrect user permissions due to a failure to check for changes in the CURLOPT_GSSAPI_DELEGATION option. This vulnerability affects krb5/kerberos/negotiate/GSSAPI transfers and could potentially result in unauthorized access to sensitive information. The safest option is to not reuse connections if the CURLOPT_GSSAPI_DELEGATION option has been changed. (CVE-2023-27536)
An authentication bypass vulnerability exists in libcurl prior to v8.0.0 where it reuses a previously established SSH connection despite the fact that an SSH option was modified, which should have prevented reuse. libcurl maintains a pool of previously used connections to reuse them for subsequent transfers if the configurations match. However, two SSH settings were omitted from the configuration check, allowing them to match easily, potentially leading to the reuse of an inappropriate connection. (CVE-2023-27538)
Note that Nessus has not tested for these issues but has instead relied only on the application’s self-reported version number.
#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The package checks in this plugin were extracted from
# SUSE update advisory SUSE-SU-2023:0865-1. The text itself
# is copyright (C) SUSE.
##
include('deprecated_nasl_level.inc');
include('compat.inc');
if (description)
{
script_id(173201);
script_version("1.10");
script_set_attribute(attribute:"plugin_modification_date", value:"2023/07/14");
script_cve_id(
"CVE-2023-27533",
"CVE-2023-27534",
"CVE-2023-27535",
"CVE-2023-27536",
"CVE-2023-27538"
);
script_xref(name:"SuSE", value:"SUSE-SU-2023:0865-1");
script_xref(name:"IAVA", value:"2023-A-0153-S");
script_name(english:"SUSE SLES12 Security Update : curl (SUSE-SU-2023:0865-1)");
script_set_attribute(attribute:"synopsis", value:
"The remote SUSE host is missing one or more security updates.");
script_set_attribute(attribute:"description", value:
"The remote SUSE Linux SLES12 / SLES_SAP12 host has packages installed that are affected by multiple vulnerabilities as
referenced in the SUSE-SU-2023:0865-1 advisory.
- A vulnerability in input validation exists in curl <8.0 during communication using the TELNET protocol may
allow an attacker to pass on maliciously crafted user name and telnet options during server negotiation.
The lack of proper input scrubbing allows an attacker to send content or perform option negotiation
without the application's intent. This vulnerability could be exploited if an application allows user
input, thereby enabling attackers to execute arbitrary code on the system. (CVE-2023-27533)
- A path traversal vulnerability exists in curl <8.0.0 SFTP implementation causes the tilde (~) character to
be wrongly replaced when used as a prefix in the first path element, in addition to its intended use as
the first element to indicate a path relative to the user's home directory. Attackers can exploit this
flaw to bypass filtering or execute arbitrary code by crafting a path like /~2/foo while accessing a
server with a specific user. (CVE-2023-27534)
- An authentication bypass vulnerability exists in libcurl <8.0.0 in the FTP connection reuse feature that
can result in wrong credentials being used during subsequent transfers. Previously created connections are
kept in a connection pool for reuse if they match the current setup. However, certain FTP settings such as
CURLOPT_FTP_ACCOUNT, CURLOPT_FTP_ALTERNATIVE_TO_USER, CURLOPT_FTP_SSL_CCC, and CURLOPT_USE_SSL were not
included in the configuration match checks, causing them to match too easily. This could lead to libcurl
using the wrong credentials when performing a transfer, potentially allowing unauthorized access to
sensitive information. (CVE-2023-27535)
- An authentication bypass vulnerability exists libcurl <8.0.0 in the connection reuse feature which can
reuse previously established connections with incorrect user permissions due to a failure to check for
changes in the CURLOPT_GSSAPI_DELEGATION option. This vulnerability affects krb5/kerberos/negotiate/GSSAPI
transfers and could potentially result in unauthorized access to sensitive information. The safest option
is to not reuse connections if the CURLOPT_GSSAPI_DELEGATION option has been changed. (CVE-2023-27536)
- An authentication bypass vulnerability exists in libcurl prior to v8.0.0 where it reuses a previously
established SSH connection despite the fact that an SSH option was modified, which should have prevented
reuse. libcurl maintains a pool of previously used connections to reuse them for subsequent transfers if
the configurations match. However, two SSH settings were omitted from the configuration check, allowing
them to match easily, potentially leading to the reuse of an inappropriate connection. (CVE-2023-27538)
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://bugzilla.suse.com/1209209");
script_set_attribute(attribute:"see_also", value:"https://bugzilla.suse.com/1209210");
script_set_attribute(attribute:"see_also", value:"https://bugzilla.suse.com/1209211");
script_set_attribute(attribute:"see_also", value:"https://bugzilla.suse.com/1209212");
script_set_attribute(attribute:"see_also", value:"https://bugzilla.suse.com/1209214");
script_set_attribute(attribute:"see_also", value:"https://www.suse.com/security/cve/CVE-2023-27533");
script_set_attribute(attribute:"see_also", value:"https://www.suse.com/security/cve/CVE-2023-27534");
script_set_attribute(attribute:"see_also", value:"https://www.suse.com/security/cve/CVE-2023-27535");
script_set_attribute(attribute:"see_also", value:"https://www.suse.com/security/cve/CVE-2023-27536");
script_set_attribute(attribute:"see_also", value:"https://www.suse.com/security/cve/CVE-2023-27538");
# https://lists.suse.com/pipermail/sle-security-updates/2023-March/014128.html
script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?9eeec7ac");
script_set_attribute(attribute:"solution", value:
"Update the affected curl, libcurl-devel, libcurl4 and / or libcurl4-32bit packages.");
script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C");
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:L/UI:N/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:"cvss_score_source", value:"CVE-2023-27533");
script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2023-27534");
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:"2023/03/20");
script_set_attribute(attribute:"patch_publication_date", value:"2023/03/21");
script_set_attribute(attribute:"plugin_publication_date", value:"2023/03/22");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:curl");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:libcurl-devel");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:libcurl4");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:libcurl4-32bit");
script_set_attribute(attribute:"cpe", value:"cpe:/o:novell:suse_linux:12");
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:"SuSE Local Security Checks");
script_copyright(english:"This script is Copyright (C) 2023 and is owned by Tenable, Inc. or an Affiliate thereof.");
script_dependencies("ssh_get_info.nasl");
script_require_keys("Host/local_checks_enabled", "Host/cpu", "Host/SuSE/release", "Host/SuSE/rpm-list");
exit(0);
}
include('rpm.inc');
if (!get_kb_item('Host/local_checks_enabled')) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
var os_release = get_kb_item("Host/SuSE/release");
if (isnull(os_release) || os_release !~ "^(SLED|SLES)") audit(AUDIT_OS_NOT, "SUSE");
var os_ver = pregmatch(pattern: "^(SLE(S|D)(?:_SAP)?\d+)", string:os_release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, 'SUSE');
os_ver = os_ver[1];
if (! preg(pattern:"^(SLES12|SLES_SAP12)$", string:os_ver)) audit(AUDIT_OS_NOT, 'SUSE SLES12 / SLES_SAP12', 'SUSE (' + os_ver + ')');
if (!get_kb_item("Host/SuSE/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);
var cpu = get_kb_item('Host/cpu');
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ('x86_64' >!< cpu && cpu !~ "^i[3-6]86$" && 's390' >!< cpu && 'aarch64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'SUSE (' + os_ver + ')', cpu);
var service_pack = get_kb_item("Host/SuSE/patchlevel");
if (isnull(service_pack)) service_pack = "0";
if (os_ver == "SLES12" && (! preg(pattern:"^(5)$", string:service_pack))) audit(AUDIT_OS_NOT, "SLES12 SP5", os_ver + " SP" + service_pack);
if (os_ver == "SLES_SAP12" && (! preg(pattern:"^(5)$", string:service_pack))) audit(AUDIT_OS_NOT, "SLES_SAP12 SP5", os_ver + " SP" + service_pack);
var pkgs = [
{'reference':'curl-7.60.0-11.60.1', 'sp':'5', 'release':'SLES_SAP12', 'rpm_spec_vers_cmp':TRUE, 'exists_check':['SLES_SAP-release-12.5']},
{'reference':'libcurl-devel-7.60.0-11.60.1', 'sp':'5', 'release':'SLES_SAP12', 'rpm_spec_vers_cmp':TRUE, 'exists_check':['SLES_SAP-release-12.5']},
{'reference':'libcurl4-32bit-7.60.0-11.60.1', 'sp':'5', 'release':'SLES_SAP12', 'rpm_spec_vers_cmp':TRUE, 'exists_check':['SLES_SAP-release-12.5']},
{'reference':'libcurl4-7.60.0-11.60.1', 'sp':'5', 'release':'SLES_SAP12', 'rpm_spec_vers_cmp':TRUE, 'exists_check':['SLES_SAP-release-12.5']},
{'reference':'libcurl-devel-7.60.0-11.60.1', 'sp':'5', 'release':'SLES12', 'rpm_spec_vers_cmp':TRUE, 'exists_check':['sle-sdk-release-12.5', 'sles-release-12.5']},
{'reference':'curl-7.60.0-11.60.1', 'sp':'5', 'release':'SLES12', 'rpm_spec_vers_cmp':TRUE, 'exists_check':['sles-release-12.5']},
{'reference':'libcurl4-32bit-7.60.0-11.60.1', 'sp':'5', 'release':'SLES12', 'rpm_spec_vers_cmp':TRUE, 'exists_check':['sles-release-12.5']},
{'reference':'libcurl4-7.60.0-11.60.1', 'sp':'5', 'release':'SLES12', 'rpm_spec_vers_cmp':TRUE, 'exists_check':['sles-release-12.5']}
];
var ltss_caveat_required = FALSE;
var flag = 0;
foreach var package_array ( pkgs ) {
var reference = NULL;
var _release = NULL;
var sp = NULL;
var _cpu = NULL;
var exists_check = NULL;
var rpm_spec_vers_cmp = NULL;
if (!empty_or_null(package_array['reference'])) reference = package_array['reference'];
if (!empty_or_null(package_array['release'])) _release = package_array['release'];
if (!empty_or_null(package_array['sp'])) sp = package_array['sp'];
if (!empty_or_null(package_array['cpu'])) _cpu = package_array['cpu'];
if (!empty_or_null(package_array['exists_check'])) exists_check = package_array['exists_check'];
if (!empty_or_null(package_array['rpm_spec_vers_cmp'])) rpm_spec_vers_cmp = package_array['rpm_spec_vers_cmp'];
if (reference && _release) {
if (exists_check) {
var check_flag = 0;
foreach var check (exists_check) {
if (!rpm_exists(release:_release, rpm:check)) continue;
check_flag++;
}
if (!check_flag) continue;
}
if (rpm_check(release:_release, sp:sp, cpu:_cpu, reference:reference, rpm_spec_vers_cmp:rpm_spec_vers_cmp)) flag++;
}
}
if (flag)
{
security_report_v4(
port : 0,
severity : SECURITY_HOLE,
extra : rpm_report_get()
);
exit(0);
}
else
{
var tested = pkg_tests_get();
if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'curl / libcurl-devel / libcurl4 / libcurl4-32bit');
}
Vendor | Product | Version | CPE |
---|---|---|---|
novell | suse_linux | curl | p-cpe:/a:novell:suse_linux:curl |
novell | suse_linux | libcurl4 | p-cpe:/a:novell:suse_linux:libcurl4 |
novell | suse_linux | libcurl-devel | p-cpe:/a:novell:suse_linux:libcurl-devel |
novell | suse_linux | 12 | cpe:/o:novell:suse_linux:12 |
novell | suse_linux | libcurl4-32bit | p-cpe:/a:novell:suse_linux:libcurl4-32bit |
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-27533
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-27534
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-27535
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-27536
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-27538
www.nessus.org/u?9eeec7ac
bugzilla.suse.com/1209209
bugzilla.suse.com/1209210
bugzilla.suse.com/1209211
bugzilla.suse.com/1209212
bugzilla.suse.com/1209214
www.suse.com/security/cve/CVE-2023-27533
www.suse.com/security/cve/CVE-2023-27534
www.suse.com/security/cve/CVE-2023-27535
www.suse.com/security/cve/CVE-2023-27536
www.suse.com/security/cve/CVE-2023-27538