5.8 Medium
CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
NONE
AV:N/AC:M/Au:N/C:P/I:P/A:N
7.5 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
0.005 Low
EPSS
Percentile
77.1%
The remote SUSE Linux SLES15 host has a package installed that is affected by multiple vulnerabilities as referenced in the SUSE-SU-2021:3020-1 advisory.
mod_auth_openidc is an authentication/authorization module for the Apache 2.x HTTP server that functions as an OpenID Connect Relying Party, authenticating users against an OpenID Connect Provider. When mod_auth_openidc versions prior to 2.4.9 are configured to use an unencrypted Redis cache (OIDCCacheEncrypt off
, OIDCSessionType server-cache
, OIDCCacheType redis
), mod_auth_openidc
wrongly performed argument interpolation before passing Redis requests to hiredis
, which would perform it again and lead to an uncontrolled format string bug. Initial assessment shows that this bug does not appear to allow gaining arbitrary code execution, but can reliably provoke a denial of service by repeatedly crashing the Apache workers. This bug has been corrected in version 2.4.9 by performing argument interpolation only once, using the hiredis
API. As a workaround, this vulnerability can be mitigated by setting OIDCCacheEncrypt
to on
, as cache keys are cryptographically hashed before use when this option is enabled. (CVE-2021-32785)
mod_auth_openidc is an authentication/authorization module for the Apache 2.x HTTP server that functions as an OpenID Connect Relying Party, authenticating users against an OpenID Connect Provider. In versions prior to 2.4.9, oidc_validate_redirect_url()
does not parse URLs the same way as most browsers do. As a result, this function can be bypassed and leads to an Open Redirect vulnerability in the logout functionality. This bug has been fixed in version 2.4.9 by replacing any backslash of the URL to redirect with slashes to address a particular breaking change between the different specifications (RFC2396 / RFC3986 and WHATWG). As a workaround, this vulnerability can be mitigated by configuring mod_auth_openidc
to only allow redirection whose destination matches a given regular expression.
(CVE-2021-32786)
mod_auth_openidc is an authentication/authorization module for the Apache 2.x HTTP server that functions as an OpenID Connect Relying Party, authenticating users against an OpenID Connect Provider. In mod_auth_openidc before version 2.4.9, the AES GCM encryption in mod_auth_openidc uses a static IV and AAD. It is important to fix because this creates a static nonce and since aes-gcm is a stream cipher, this can lead to known cryptographic issues, since the same key is being reused. From 2.4.9 onwards this has been patched to use dynamic values through usage of cjose AES encryption routines. (CVE-2021-32791)
mod_auth_openidc is an authentication/authorization module for the Apache 2.x HTTP server that functions as an OpenID Connect Relying Party, authenticating users against an OpenID Connect Provider. In mod_auth_openidc before version 2.4.9, there is an XSS vulnerability in when using OIDCPreservePost On
.
(CVE-2021-32792)
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 70300
##
# (C) Tenable, Inc.
#
# The package checks in this plugin were extracted from
# SUSE update advisory SUSE-SU-2021:3020-1. The text itself
# is copyright (C) SUSE.
##
include('deprecated_nasl_level.inc');
include('compat.inc');
if (description)
{
script_id(153248);
script_version("1.4");
script_set_attribute(attribute:"plugin_modification_date", value:"2023/07/14");
script_cve_id(
"CVE-2021-32785",
"CVE-2021-32786",
"CVE-2021-32791",
"CVE-2021-32792"
);
script_xref(name:"SuSE", value:"SUSE-SU-2021:3020-1");
script_name(english:"SUSE SLES15 Security Update : apache2-mod_auth_openidc (SUSE-SU-2021:3020-1)");
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 SLES15 host has a package installed that is affected by multiple vulnerabilities as referenced in
the SUSE-SU-2021:3020-1 advisory.
- mod_auth_openidc is an authentication/authorization module for the Apache 2.x HTTP server that functions
as an OpenID Connect Relying Party, authenticating users against an OpenID Connect Provider. When
mod_auth_openidc versions prior to 2.4.9 are configured to use an unencrypted Redis cache
(`OIDCCacheEncrypt off`, `OIDCSessionType server-cache`, `OIDCCacheType redis`), `mod_auth_openidc`
wrongly performed argument interpolation before passing Redis requests to `hiredis`, which would perform
it again and lead to an uncontrolled format string bug. Initial assessment shows that this bug does not
appear to allow gaining arbitrary code execution, but can reliably provoke a denial of service by
repeatedly crashing the Apache workers. This bug has been corrected in version 2.4.9 by performing
argument interpolation only once, using the `hiredis` API. As a workaround, this vulnerability can be
mitigated by setting `OIDCCacheEncrypt` to `on`, as cache keys are cryptographically hashed before use
when this option is enabled. (CVE-2021-32785)
- mod_auth_openidc is an authentication/authorization module for the Apache 2.x HTTP server that functions
as an OpenID Connect Relying Party, authenticating users against an OpenID Connect Provider. In versions
prior to 2.4.9, `oidc_validate_redirect_url()` does not parse URLs the same way as most browsers do. As a
result, this function can be bypassed and leads to an Open Redirect vulnerability in the logout
functionality. This bug has been fixed in version 2.4.9 by replacing any backslash of the URL to redirect
with slashes to address a particular breaking change between the different specifications (RFC2396 /
RFC3986 and WHATWG). As a workaround, this vulnerability can be mitigated by configuring
`mod_auth_openidc` to only allow redirection whose destination matches a given regular expression.
(CVE-2021-32786)
- mod_auth_openidc is an authentication/authorization module for the Apache 2.x HTTP server that functions
as an OpenID Connect Relying Party, authenticating users against an OpenID Connect Provider. In
mod_auth_openidc before version 2.4.9, the AES GCM encryption in mod_auth_openidc uses a static IV and
AAD. It is important to fix because this creates a static nonce and since aes-gcm is a stream cipher, this
can lead to known cryptographic issues, since the same key is being reused. From 2.4.9 onwards this has
been patched to use dynamic values through usage of cjose AES encryption routines. (CVE-2021-32791)
- mod_auth_openidc is an authentication/authorization module for the Apache 2.x HTTP server that functions
as an OpenID Connect Relying Party, authenticating users against an OpenID Connect Provider. In
mod_auth_openidc before version 2.4.9, there is an XSS vulnerability in when using `OIDCPreservePost On`.
(CVE-2021-32792)
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/1188638");
script_set_attribute(attribute:"see_also", value:"https://bugzilla.suse.com/1188639");
script_set_attribute(attribute:"see_also", value:"https://bugzilla.suse.com/1188848");
script_set_attribute(attribute:"see_also", value:"https://bugzilla.suse.com/1188849");
script_set_attribute(attribute:"see_also", value:"https://www.suse.com/security/cve/CVE-2021-32785");
script_set_attribute(attribute:"see_also", value:"https://www.suse.com/security/cve/CVE-2021-32786");
script_set_attribute(attribute:"see_also", value:"https://www.suse.com/security/cve/CVE-2021-32791");
script_set_attribute(attribute:"see_also", value:"https://www.suse.com/security/cve/CVE-2021-32792");
# https://lists.suse.com/pipermail/sle-security-updates/2021-September/009431.html
script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?cd988498");
script_set_attribute(attribute:"solution", value:
"Update the affected apache2-mod_auth_openidc package.");
script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:N");
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:N/UI:R/S:C/C:L/I:L/A:N");
script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
script_set_attribute(attribute:"cvss_score_source", value:"CVE-2021-32786");
script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2021-32792");
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:"2021/07/22");
script_set_attribute(attribute:"patch_publication_date", value:"2021/09/13");
script_set_attribute(attribute:"plugin_publication_date", value:"2021/09/14");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:apache2-mod_auth_openidc");
script_set_attribute(attribute:"cpe", value:"cpe:/o:novell:suse_linux:15");
script_set_attribute(attribute:"generated_plugin", value:"current");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_family(english:"SuSE Local Security Checks");
script_copyright(english:"This script is Copyright (C) 2021-2023 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)\d+)", string:os_release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, 'SUSE');
os_ver = os_ver[1];
if (! preg(pattern:"^(SLES15)$", string:os_ver)) audit(AUDIT_OS_NOT, 'SUSE SLES15', 'SUSE (' + os_ver + ')');
if (!get_kb_item("Host/SuSE/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);
var cpu = get_kb_item('Host/cpu');
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ('x86_64' >!< cpu && cpu !~ "^i[3-6]86$" && '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 == "SLES15" && (! preg(pattern:"^(2|3)$", string:service_pack))) audit(AUDIT_OS_NOT, "SLES15 SP2/3", os_ver + " SP" + service_pack);
var pkgs = [
{'reference':'apache2-mod_auth_openidc-2.3.8-3.15.1', 'sp':'2', 'release':'SLES15', 'rpm_spec_vers_cmp':TRUE, 'exists_check':['sle-module-server-applications-release-15.2']},
{'reference':'apache2-mod_auth_openidc-2.3.8-3.15.1', 'sp':'3', 'release':'SLES15', 'rpm_spec_vers_cmp':TRUE, 'exists_check':['sle-module-server-applications-release-15.3']}
];
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_WARNING,
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, 'apache2-mod_auth_openidc');
}
Vendor | Product | Version | CPE |
---|---|---|---|
novell | suse_linux | apache2-mod_auth_openidc | p-cpe:/a:novell:suse_linux:apache2-mod_auth_openidc |
novell | suse_linux | 15 | cpe:/o:novell:suse_linux:15 |
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-32785
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-32786
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-32791
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-32792
www.nessus.org/u?cd988498
bugzilla.suse.com/1188638
bugzilla.suse.com/1188639
bugzilla.suse.com/1188848
bugzilla.suse.com/1188849
www.suse.com/security/cve/CVE-2021-32785
www.suse.com/security/cve/CVE-2021-32786
www.suse.com/security/cve/CVE-2021-32791
www.suse.com/security/cve/CVE-2021-32792
5.8 Medium
CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
NONE
AV:N/AC:M/Au:N/C:P/I:P/A:N
7.5 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
0.005 Low
EPSS
Percentile
77.1%