9.3 High
CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:N/AC:M/Au:N/C:C/I:C/A:C
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
0.005 Low
EPSS
Percentile
77.0%
This update addresses two security vulnerabilities :
CVE-2017-15670, CVE-2017-15671, CVE-2017-15804: Various vulnerabilities could lead to memory corruption in the glob
and glob64
function. (RHBZ#1505298, RHBZ##1504807)
CVE-2017-16997: Check for empty tokens before dynamic string token expansion in the dynamic linker, so that pre-existing privileged programs with $ORIGIN
rpaths/runpaths do not cause the dynamic linker to search the current directory, potentially leading to privilege escalation. (RHBZ#1526866).
CVE-2018-1000001: getcwd
would sometimes return a non-absolute path, confusing the realpath
function, leading to privilege escalation in conjunction with user namespaces. (RHBZ#1533837)
In addition, this update replaces the dynamic linker trampoline on x86-64 with a version which uses the XSAVE
instruction if it is available. This improves compatibility with future hardware and compilers which do not follow the x86-64 ABI. This update also adjusts the thread stack size accounting to provide additional stack space compared to previous glibc versions (to avoid introducing RHBZ#1527887).
Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website.
Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.
#%NASL_MIN_LEVEL 70300
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Fedora Security Advisory FEDORA-2018-8e27ad96ed.
#
include('deprecated_nasl_level.inc');
include('compat.inc');
if (description)
{
script_id(106281);
script_version("3.7");
script_set_attribute(attribute:"plugin_modification_date", value:"2021/01/06");
script_cve_id("CVE-2017-15670", "CVE-2017-15671", "CVE-2017-15804", "CVE-2017-16997", "CVE-2018-1000001");
script_xref(name:"FEDORA", value:"2018-8e27ad96ed");
script_name(english:"Fedora 26 : glibc (2018-8e27ad96ed)");
script_summary(english:"Checks rpm output for the updated package.");
script_set_attribute(
attribute:"synopsis",
value:"The remote Fedora host is missing a security update."
);
script_set_attribute(
attribute:"description",
value:
"This update addresses two security vulnerabilities :
- CVE-2017-15670, CVE-2017-15671, CVE-2017-15804: Various
vulnerabilities could lead to memory corruption in the
`glob` and `glob64` function. (RHBZ#1505298,
RHBZ##1504807)
- CVE-2017-16997: Check for empty tokens before dynamic
string token expansion in the dynamic linker, so that
pre-existing privileged programs with `$ORIGIN`
rpaths/runpaths do not cause the dynamic linker to
search the current directory, potentially leading to
privilege escalation. (RHBZ#1526866).
- CVE-2018-1000001: `getcwd` would sometimes return a
non-absolute path, confusing the `realpath` function,
leading to privilege escalation in conjunction with user
namespaces. (RHBZ#1533837)
In addition, this update replaces the dynamic linker trampoline on
x86-64 with a version which uses the `XSAVE` instruction if it is
available. This improves compatibility with future hardware and
compilers which do not follow the x86-64 ABI. This update also adjusts
the thread stack size accounting to provide additional stack space
compared to previous glibc versions (to avoid introducing
RHBZ#1527887).
Note that Tenable Network Security has extracted the preceding
description block directly from the Fedora update system website.
Tenable has attempted to automatically clean and format it as much as
possible without introducing additional issues."
);
script_set_attribute(
attribute:"see_also",
value:"https://bodhi.fedoraproject.org/updates/FEDORA-2018-8e27ad96ed"
);
script_set_attribute(attribute:"solution", value:"Update the affected glibc package.");
script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:C/I:C/A:C");
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:"metasploit_name", value:'glibc "realpath()" Privilege Escalation');
script_set_attribute(attribute:"exploit_framework_metasploit", value:"true");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:fedoraproject:fedora:glibc");
script_set_attribute(attribute:"cpe", value:"cpe:/o:fedoraproject:fedora:26");
script_set_attribute(attribute:"vuln_publication_date", value:"2017/10/20");
script_set_attribute(attribute:"patch_publication_date", value:"2018/01/23");
script_set_attribute(attribute:"plugin_publication_date", value:"2018/01/24");
script_set_attribute(attribute:"generated_plugin", value:"current");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_copyright(english:"This script is Copyright (C) 2018-2021 and is owned by Tenable, Inc. or an Affiliate thereof.");
script_family(english:"Fedora Local Security Checks");
script_dependencies("ssh_get_info.nasl");
script_require_keys("Host/local_checks_enabled", "Host/RedHat/release", "Host/RedHat/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/RedHat/release");
if (isnull(release) || "Fedora" >!< release) audit(AUDIT_OS_NOT, "Fedora");
os_ver = pregmatch(pattern: "Fedora.*release ([0-9]+)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "Fedora");
os_ver = os_ver[1];
if (! preg(pattern:"^26([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, "Fedora 26", "Fedora " + os_ver);
if (!get_kb_item("Host/RedHat/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);
cpu = get_kb_item("Host/cpu");
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ("x86_64" >!< cpu && cpu !~ "^i[3-6]86$") audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "Fedora", cpu);
flag = 0;
if (rpm_check(release:"FC26", reference:"glibc-2.25-13.fc26")) flag++;
if (flag)
{
security_report_v4(
port : 0,
severity : SECURITY_HOLE,
extra : rpm_report_get()
);
exit(0);
}
else
{
tested = pkg_tests_get();
if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
else audit(AUDIT_PACKAGE_NOT_INSTALLED, "glibc");
}
Vendor | Product | Version | CPE |
---|---|---|---|
fedoraproject | fedora | glibc | p-cpe:/a:fedoraproject:fedora:glibc |
fedoraproject | fedora | 26 | cpe:/o:fedoraproject:fedora:26 |
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-15670
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-15671
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-15804
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-16997
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-1000001
bodhi.fedoraproject.org/updates/FEDORA-2018-8e27ad96ed
9.3 High
CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:N/AC:M/Au:N/C:C/I:C/A:C
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
0.005 Low
EPSS
Percentile
77.0%