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:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS
Percentile
80.1%
update to upstream release 0.3.1.9. Fixes :
CVE-2017-8819: Replay-cache ineffective for v2 onion services
CVE-2017-8820: Remote DoS attack against directory authorities
CVE-2017-8821: An attacker can make Tor ask for a password
CVE-2017-8822: Relays can pick themselves in a circuit path
CVE-2017-8823: Use-after-free in onion service v2
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-2017-bce9e03721.
#
include('deprecated_nasl_level.inc');
include('compat.inc');
if (description)
{
script_id(105334);
script_version("3.6");
script_set_attribute(attribute:"plugin_modification_date", value:"2021/01/06");
script_cve_id("CVE-2017-8819", "CVE-2017-8820", "CVE-2017-8821", "CVE-2017-8822", "CVE-2017-8823");
script_xref(name:"FEDORA", value:"2017-bce9e03721");
script_name(english:"Fedora 26 : tor (2017-bce9e03721)");
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:
"update to upstream release 0.3.1.9. Fixes :
- CVE-2017-8819: Replay-cache ineffective for v2 onion
services
- CVE-2017-8820: Remote DoS attack against directory
authorities
- CVE-2017-8821: An attacker can make Tor ask for a
password
- CVE-2017-8822: Relays can pick themselves in a circuit
path
- CVE-2017-8823: Use-after-free in onion service v2
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-2017-bce9e03721"
);
script_set_attribute(attribute:"solution", value:"Update the affected tor package.");
script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:P");
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_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:fedoraproject:fedora:tor");
script_set_attribute(attribute:"cpe", value:"cpe:/o:fedoraproject:fedora:26");
script_set_attribute(attribute:"vuln_publication_date", value:"2017/12/03");
script_set_attribute(attribute:"patch_publication_date", value:"2017/12/17");
script_set_attribute(attribute:"plugin_publication_date", value:"2017/12/18");
script_set_attribute(attribute:"generated_plugin", value:"current");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_copyright(english:"This script is Copyright (C) 2017-2021 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:"tor-0.3.1.9-1.fc26")) flag++;
if (flag)
{
security_report_v4(
port : 0,
severity : SECURITY_WARNING,
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, "tor");
}
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-8819
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-8820
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-8821
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-8822
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-8823
bodhi.fedoraproject.org/updates/FEDORA-2017-bce9e03721
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:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS
Percentile
80.1%