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
0.002 Low
EPSS
Percentile
56.4%
It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2023-282 advisory.
When gRPC HTTP2 stack raised a header size exceeded error, it skipped parsing the rest of the HPACK frame.
This caused any HPACK table mutations to also be skipped, resulting in a desynchronization of HPACK tables between sender and receiver. If leveraged, say, between a proxy and a backend, this could lead to requests from the proxy being interpreted as containing headers from different proxy clients - leading to an information leak that can be used for privilege escalation or data exfiltration. We recommend upgrading beyond the commit contained in https://github.com/grpc/grpc/pull/33005 https://github.com/grpc/grpc/pull/33005 (CVE-2023-32731)
gRPC contains a vulnerability whereby a client can cause a termination of connection between a HTTP2 proxy and a gRPC server: a base64 encoding error for -bin
suffixed headers will result in a disconnection by the gRPC server, but is typically allowed by HTTP2 proxies. We recommend upgrading beyond the commit in https://github.com/grpc/grpc/pull/32309 https://www.google.com/url (CVE-2023-32732)
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 descriptive text and package checks in this plugin were
# extracted from Amazon Linux 2023 Security Advisory ALAS2023-2023-282.
##
include('compat.inc');
if (description)
{
script_id(179767);
script_version("1.1");
script_set_attribute(attribute:"plugin_modification_date", value:"2023/10/17");
script_cve_id("CVE-2023-32731", "CVE-2023-32732", "CVE-2023-4785");
script_name(english:"Amazon Linux 2023 : grpc, grpc-cpp, grpc-data (ALAS2023-2023-282)");
script_set_attribute(attribute:"synopsis", value:
"The remote Amazon Linux 2023 host is missing a security update.");
script_set_attribute(attribute:"description", value:
"It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2023-282 advisory.
- When gRPC HTTP2 stack raised a header size exceeded error, it skipped parsing the rest of the HPACK frame.
This caused any HPACK table mutations to also be skipped, resulting in a desynchronization of HPACK tables
between sender and receiver. If leveraged, say, between a proxy and a backend, this could lead to requests
from the proxy being interpreted as containing headers from different proxy clients - leading to an
information leak that can be used for privilege escalation or data exfiltration. We recommend upgrading
beyond the commit contained in https://github.com/grpc/grpc/pull/33005
https://github.com/grpc/grpc/pull/33005 (CVE-2023-32731)
- gRPC contains a vulnerability whereby a client can cause a termination of connection between a HTTP2 proxy
and a gRPC server: a base64 encoding error for `-bin` suffixed headers will result in a disconnection by
the gRPC server, but is typically allowed by HTTP2 proxies. We recommend upgrading beyond the commit in
https://github.com/grpc/grpc/pull/32309 https://www.google.com/url (CVE-2023-32732)
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://alas.aws.amazon.com/AL2023/ALAS-2023-282.html");
script_set_attribute(attribute:"see_also", value:"https://alas.aws.amazon.com/faqs.html");
script_set_attribute(attribute:"see_also", value:"https://alas.aws.amazon.com/cve/html/CVE-2023-32731.html");
script_set_attribute(attribute:"see_also", value:"https://alas.aws.amazon.com/cve/html/CVE-2023-32732.html");
script_set_attribute(attribute:"see_also", value:"https://alas.aws.amazon.com/cve/html/CVE-2023-4785.html");
script_set_attribute(attribute:"solution", value:
"Run 'dnf update grpc --releasever 2023.1.20230809' to update your system.");
script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:C/I:N/A:N");
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:H/I:N/A:N");
script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
script_set_attribute(attribute:"cvss_score_source", value:"CVE-2023-32731");
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:"2023/06/09");
script_set_attribute(attribute:"patch_publication_date", value:"2023/08/03");
script_set_attribute(attribute:"plugin_publication_date", value:"2023/08/14");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:grpc");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:grpc-cpp");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:grpc-cpp-debuginfo");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:grpc-data");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:grpc-debuginfo");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:grpc-debugsource");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:grpc-devel");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:grpc-doc");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:grpc-plugins");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:grpc-plugins-debuginfo");
script_set_attribute(attribute:"cpe", value:"cpe:/o:amazon:linux:2023");
script_set_attribute(attribute:"generated_plugin", value:"current");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_family(english:"Amazon Linux 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/AmazonLinux/release", "Host/AmazonLinux/rpm-list");
exit(0);
}
include("rpm.inc");
if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
var alas_release = get_kb_item("Host/AmazonLinux/release");
if (isnull(alas_release) || !strlen(alas_release)) audit(AUDIT_OS_NOT, "Amazon Linux");
var os_ver = pregmatch(pattern: "^AL(A|\d+|-\d+)", string:alas_release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "Amazon Linux");
os_ver = os_ver[1];
if (os_ver != "-2023")
{
if (os_ver == 'A') os_ver = 'AMI';
audit(AUDIT_OS_NOT, "Amazon Linux 2023", "Amazon Linux " + os_ver);
}
if (!get_kb_item("Host/AmazonLinux/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);
var pkgs = [
{'reference':'grpc-1.56.2-10.amzn2023', 'cpu':'aarch64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
{'reference':'grpc-1.56.2-10.amzn2023', 'cpu':'x86_64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
{'reference':'grpc-cpp-1.56.2-10.amzn2023', 'cpu':'aarch64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
{'reference':'grpc-cpp-1.56.2-10.amzn2023', 'cpu':'x86_64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
{'reference':'grpc-cpp-debuginfo-1.56.2-10.amzn2023', 'cpu':'aarch64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
{'reference':'grpc-cpp-debuginfo-1.56.2-10.amzn2023', 'cpu':'x86_64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
{'reference':'grpc-data-1.56.2-10.amzn2023', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
{'reference':'grpc-debuginfo-1.56.2-10.amzn2023', 'cpu':'aarch64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
{'reference':'grpc-debuginfo-1.56.2-10.amzn2023', 'cpu':'x86_64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
{'reference':'grpc-debugsource-1.56.2-10.amzn2023', 'cpu':'aarch64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
{'reference':'grpc-debugsource-1.56.2-10.amzn2023', 'cpu':'x86_64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
{'reference':'grpc-devel-1.56.2-10.amzn2023', 'cpu':'aarch64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
{'reference':'grpc-devel-1.56.2-10.amzn2023', 'cpu':'x86_64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
{'reference':'grpc-doc-1.56.2-10.amzn2023', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
{'reference':'grpc-plugins-1.56.2-10.amzn2023', 'cpu':'aarch64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
{'reference':'grpc-plugins-1.56.2-10.amzn2023', 'cpu':'x86_64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
{'reference':'grpc-plugins-debuginfo-1.56.2-10.amzn2023', 'cpu':'aarch64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
{'reference':'grpc-plugins-debuginfo-1.56.2-10.amzn2023', 'cpu':'x86_64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE}
];
var flag = 0;
foreach var package_array ( pkgs ) {
var reference = NULL;
var _release = NULL;
var sp = NULL;
var _cpu = NULL;
var el_string = NULL;
var rpm_spec_vers_cmp = NULL;
var epoch = NULL;
var allowmaj = NULL;
var exists_check = 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['el_string'])) el_string = package_array['el_string'];
if (!empty_or_null(package_array['rpm_spec_vers_cmp'])) rpm_spec_vers_cmp = package_array['rpm_spec_vers_cmp'];
if (!empty_or_null(package_array['epoch'])) epoch = package_array['epoch'];
if (!empty_or_null(package_array['allowmaj'])) allowmaj = package_array['allowmaj'];
if (!empty_or_null(package_array['exists_check'])) exists_check = package_array['exists_check'];
if (reference && _release && (!exists_check || rpm_exists(release:_release, rpm:exists_check))) {
if (rpm_check(release:_release, sp:sp, cpu:_cpu, reference:reference, epoch:epoch, el_string:el_string, rpm_spec_vers_cmp:rpm_spec_vers_cmp, allowmaj:allowmaj)) 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, "grpc / grpc-cpp / grpc-cpp-debuginfo / etc");
}
Vendor | Product | Version | CPE |
---|---|---|---|
amazon | linux | grpc | p-cpe:/a:amazon:linux:grpc |
amazon | linux | grpc-cpp | p-cpe:/a:amazon:linux:grpc-cpp |
amazon | linux | grpc-cpp-debuginfo | p-cpe:/a:amazon:linux:grpc-cpp-debuginfo |
amazon | linux | grpc-data | p-cpe:/a:amazon:linux:grpc-data |
amazon | linux | grpc-debuginfo | p-cpe:/a:amazon:linux:grpc-debuginfo |
amazon | linux | grpc-debugsource | p-cpe:/a:amazon:linux:grpc-debugsource |
amazon | linux | grpc-devel | p-cpe:/a:amazon:linux:grpc-devel |
amazon | linux | grpc-doc | p-cpe:/a:amazon:linux:grpc-doc |
amazon | linux | grpc-plugins | p-cpe:/a:amazon:linux:grpc-plugins |
amazon | linux | grpc-plugins-debuginfo | p-cpe:/a:amazon:linux:grpc-plugins-debuginfo |
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-32731
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-32732
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-4785
alas.aws.amazon.com/AL2023/ALAS-2023-282.html
alas.aws.amazon.com/cve/html/CVE-2023-32731.html
alas.aws.amazon.com/cve/html/CVE-2023-32732.html
alas.aws.amazon.com/cve/html/CVE-2023-4785.html
alas.aws.amazon.com/faqs.html