CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:M/Au:N/C:P/I:P/A:P
CVSS3
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS
Percentile
96.3%
According to the versions of the rsyslog packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :
imtcp
, imptcp
, imgssapi
, and imhttp
are used for regular syslog message reception. It is best practice not to directly expose them to the public. When this practice is followed, the risk is considerably lower. Module imdiag
is a diagnostics module primarily intended for testbench runs. We do not expect it to be present on any production installation. Octet-counted framing is not very common. Usually, it needs to be specifically enabled at senders. If users do not need it, they can turn it off for the most important modules. This will mitigate the vulnerability. (CVE-2022-24903)Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.
#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
##
include('compat.inc');
if (description)
{
script_id(166663);
script_version("1.2");
script_set_attribute(attribute:"plugin_modification_date", value:"2022/10/28");
script_cve_id("CVE-2022-24903");
script_name(english:"EulerOS 2.0 SP3 : rsyslog (EulerOS-SA-2022-2633)");
script_set_attribute(attribute:"synopsis", value:
"The remote EulerOS host is missing a security update.");
script_set_attribute(attribute:"description", value:
"According to the versions of the rsyslog packages installed, the EulerOS installation on the remote host is affected by
the following vulnerabilities :
- Rsyslog is a rocket-fast system for log processing. Modules for TCP syslog reception have a potential heap
buffer overflow when octet-counted framing is used. This can result in a segfault or some other
malfunction. As of our understanding, this vulnerability can not be used for remote code execution. But
there may still be a slight chance for experts to do that. The bug occurs when the octet count is read.
While there is a check for the maximum number of octets, digits are written to a heap buffer even when the
octet count is over the maximum, This can be used to overrun the memory buffer. However, once the sequence
of digits stop, no additional characters can be added to the buffer. In our opinion, this makes remote
exploits impossible or at least highly complex. Octet-counted framing is one of two potential framing
modes. It is relatively uncommon, but enabled by default on receivers. Modules `imtcp`, `imptcp`,
`imgssapi`, and `imhttp` are used for regular syslog message reception. It is best practice not to
directly expose them to the public. When this practice is followed, the risk is considerably lower. Module
`imdiag` is a diagnostics module primarily intended for testbench runs. We do not expect it to be present
on any production installation. Octet-counted framing is not very common. Usually, it needs to be
specifically enabled at senders. If users do not need it, they can turn it off for the most important
modules. This will mitigate the vulnerability. (CVE-2022-24903)
Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security
advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional
issues.");
# https://developer.huaweicloud.com/ict/en/site-euleros/euleros/security-advisories/EulerOS-SA-2022-2633
script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?893b2048");
script_set_attribute(attribute:"solution", value:
"Update the affected rsyslog packages.");
script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:P");
script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:H/PR:N/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-2022-24903");
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:"2022/05/06");
script_set_attribute(attribute:"patch_publication_date", value:"2022/10/27");
script_set_attribute(attribute:"plugin_publication_date", value:"2022/10/28");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:rsyslog");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:rsyslog-gnutls");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:rsyslog-gssapi");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:rsyslog-mmjsonparse");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:rsyslog-mysql");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:rsyslog-pgsql");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:rsyslog-relp");
script_set_attribute(attribute:"cpe", value:"cpe:/o:huawei:euleros:2.0");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_family(english:"Huawei Local Security Checks");
script_copyright(english:"This script is Copyright (C) 2022 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/EulerOS/release", "Host/EulerOS/rpm-list", "Host/EulerOS/sp");
script_exclude_keys("Host/EulerOS/uvp_version");
exit(0);
}
include("rpm.inc");
if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
var _release = get_kb_item("Host/EulerOS/release");
if (isnull(_release) || _release !~ "^EulerOS") audit(AUDIT_OS_NOT, "EulerOS");
var uvp = get_kb_item("Host/EulerOS/uvp_version");
if (_release !~ "^EulerOS release 2\.0(\D|$)") audit(AUDIT_OS_NOT, "EulerOS 2.0 SP3");
var sp = get_kb_item("Host/EulerOS/sp");
if (isnull(sp) || sp !~ "^(3)$") audit(AUDIT_OS_NOT, "EulerOS 2.0 SP3");
if (!empty_or_null(uvp)) audit(AUDIT_OS_NOT, "EulerOS 2.0 SP3", "EulerOS UVP " + uvp);
if (!get_kb_item("Host/EulerOS/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$" && "aarch64" >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "EulerOS", cpu);
if ("x86_64" >!< cpu && cpu !~ "^i[3-6]86$") audit(AUDIT_ARCH_NOT, "i686 / x86_64", cpu);
var flag = 0;
var pkgs = [
"rsyslog-7.4.7-7.2.h27",
"rsyslog-gnutls-7.4.7-7.2.h27",
"rsyslog-gssapi-7.4.7-7.2.h27",
"rsyslog-mmjsonparse-7.4.7-7.2.h27",
"rsyslog-mysql-7.4.7-7.2.h27",
"rsyslog-pgsql-7.4.7-7.2.h27",
"rsyslog-relp-7.4.7-7.2.h27"
];
foreach (var pkg in pkgs)
if (rpm_check(release:"EulerOS-2.0", sp:"3", reference:pkg)) 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, "rsyslog");
}
CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:M/Au:N/C:P/I:P/A:P
CVSS3
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS
Percentile
96.3%