7.5 High
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:P/I:P/A:P
9.8 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
0.968 High
EPSS
Percentile
99.7%
Buffer overflow in b64decode() function, possibly leading to remote code execution :
An issue was discovered in the base64d function in the SMTP listener in Exim before 4.90.1. By sending a handcrafted message, a buffer overflow may happen. This can be used to execute code remotely.
(CVE-2018-6789)
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Amazon Linux AMI Security Advisory ALAS-2018-970.
#
include("compat.inc");
if (description)
{
script_id(107241);
script_version("1.11");
script_set_attribute(attribute:"plugin_modification_date", value:"2022/12/06");
script_cve_id("CVE-2018-6789");
script_xref(name:"ALAS", value:"2018-970");
script_xref(name:"CISA-KNOWN-EXPLOITED", value:"2022/05/03");
script_xref(name:"CEA-ID", value:"CEA-2020-0129");
script_name(english:"Amazon Linux AMI : exim (ALAS-2018-970)");
script_summary(english:"Checks rpm output for the updated packages");
script_set_attribute(
attribute:"synopsis",
value:"The remote Amazon Linux AMI host is missing a security update."
);
script_set_attribute(
attribute:"description",
value:
"Buffer overflow in b64decode() function, possibly leading to remote
code execution :
An issue was discovered in the base64d function in the SMTP listener
in Exim before 4.90.1. By sending a handcrafted message, a buffer
overflow may happen. This can be used to execute code remotely.
(CVE-2018-6789)"
);
script_set_attribute(
attribute:"see_also",
value:"https://alas.aws.amazon.com/ALAS-2018-970.html"
);
script_set_attribute(
attribute:"solution",
value:"Run 'yum update exim' to update your system."
);
script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P");
script_set_cvss_temporal_vector("CVSS2#E:F/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:H/A:H");
script_set_cvss3_temporal_vector("CVSS:3.0/E:F/RL:O/RC:C");
script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
script_set_attribute(attribute:"exploit_available", value:"true");
script_set_attribute(attribute:"exploit_framework_canvas", value:"true");
script_set_attribute(attribute:"canvas_package", value:'CANVAS');
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:exim");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:exim-debuginfo");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:exim-greylist");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:exim-mon");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:exim-mysql");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:exim-pgsql");
script_set_attribute(attribute:"cpe", value:"cpe:/o:amazon:linux");
script_set_attribute(attribute:"vuln_publication_date", value:"2018/02/08");
script_set_attribute(attribute:"patch_publication_date", value:"2018/03/07");
script_set_attribute(attribute:"plugin_publication_date", value:"2018/03/09");
script_set_attribute(attribute:"in_the_news", value:"true");
script_set_attribute(attribute:"generated_plugin", value:"current");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_copyright(english:"This script is Copyright (C) 2018-2022 and is owned by Tenable, Inc. or an Affiliate thereof.");
script_family(english:"Amazon Linux Local Security Checks");
script_dependencies("ssh_get_info.nasl");
script_require_keys("Host/local_checks_enabled", "Host/AmazonLinux/release", "Host/AmazonLinux/rpm-list");
exit(0);
}
include("audit.inc");
include("global_settings.inc");
include("rpm.inc");
if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
release = get_kb_item("Host/AmazonLinux/release");
if (isnull(release) || !strlen(release)) audit(AUDIT_OS_NOT, "Amazon Linux");
os_ver = pregmatch(pattern: "^AL(A|\d)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "Amazon Linux");
os_ver = os_ver[1];
if (os_ver != "A")
{
if (os_ver == 'A') os_ver = 'AMI';
audit(AUDIT_OS_NOT, "Amazon Linux AMI", "Amazon Linux " + os_ver);
}
if (!get_kb_item("Host/AmazonLinux/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);
flag = 0;
if (rpm_check(release:"ALA", reference:"exim-4.90.1-2.14.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"exim-debuginfo-4.90.1-2.14.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"exim-greylist-4.90.1-2.14.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"exim-mon-4.90.1-2.14.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"exim-mysql-4.90.1-2.14.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"exim-pgsql-4.90.1-2.14.amzn1")) flag++;
if (flag)
{
if (report_verbosity > 0) security_hole(port:0, extra:rpm_report_get());
else security_hole(0);
exit(0);
}
else
{
tested = pkg_tests_get();
if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
else audit(AUDIT_PACKAGE_NOT_INSTALLED, "exim / exim-debuginfo / exim-greylist / exim-mon / exim-mysql / etc");
}
Vendor | Product | Version | CPE |
---|---|---|---|
amazon | linux | exim | p-cpe:/a:amazon:linux:exim |
amazon | linux | exim-debuginfo | p-cpe:/a:amazon:linux:exim-debuginfo |
amazon | linux | exim-greylist | p-cpe:/a:amazon:linux:exim-greylist |
amazon | linux | exim-mon | p-cpe:/a:amazon:linux:exim-mon |
amazon | linux | exim-mysql | p-cpe:/a:amazon:linux:exim-mysql |
amazon | linux | exim-pgsql | p-cpe:/a:amazon:linux:exim-pgsql |
amazon | linux | cpe:/o:amazon:linux |
7.5 High
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:P/I:P/A:P
9.8 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
0.968 High
EPSS
Percentile
99.7%