5 Medium
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:N/I:N/A:P
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:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
0.017 Low
EPSS
Percentile
87.8%
Several issues were discovered in openvpn, a virtual private network application.
CVE-2017-7479 It was discovered that openvpn did not properly handle the rollover of packet identifiers. This would allow an authenticated remote attacker to cause a denial-of-service via application crash.
CVE-2017-7508 Guido Vranken discovered that openvpn did not properly handle specific malformed IPv6 packets. This would allow a remote attacker to cause a denial-of-service via application crash.
CVE-2017-7520 Guido Vranken discovered that openvpn did not properly handle clients connecting to an HTTP proxy with NTLMv2 authentication. This would allow a remote attacker to cause a denial-of-service via application crash, or potentially leak sensitive information like the user’s proxy password.
CVE-2017-7521 Guido Vranken discovered that openvpn did not properly handle some x509 extensions. This would allow a remote attacker to cause a denial-of-service via application crash.
#%NASL_MIN_LEVEL 70300
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Debian Security Advisory DSA-3900. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#
include('deprecated_nasl_level.inc');
include('compat.inc');
if (description)
{
script_id(101067);
script_version("3.12");
script_set_attribute(attribute:"plugin_modification_date", value:"2021/01/04");
script_cve_id("CVE-2017-7479", "CVE-2017-7508", "CVE-2017-7520", "CVE-2017-7521");
script_xref(name:"DSA", value:"3900");
script_name(english:"Debian DSA-3900-1 : openvpn - security update");
script_summary(english:"Checks dpkg output for the updated package");
script_set_attribute(
attribute:"synopsis",
value:"The remote Debian host is missing a security-related update."
);
script_set_attribute(
attribute:"description",
value:
"Several issues were discovered in openvpn, a virtual private network
application.
- CVE-2017-7479
It was discovered that openvpn did not properly handle
the rollover of packet identifiers. This would allow an
authenticated remote attacker to cause a
denial-of-service via application crash.
- CVE-2017-7508
Guido Vranken discovered that openvpn did not properly
handle specific malformed IPv6 packets. This would allow
a remote attacker to cause a denial-of-service via
application crash.
- CVE-2017-7520
Guido Vranken discovered that openvpn did not properly
handle clients connecting to an HTTP proxy with NTLMv2
authentication. This would allow a remote attacker to
cause a denial-of-service via application crash, or
potentially leak sensitive information like the user's
proxy password.
- CVE-2017-7521
Guido Vranken discovered that openvpn did not properly
handle some x509 extensions. This would allow a remote
attacker to cause a denial-of-service via application
crash."
);
script_set_attribute(
attribute:"see_also",
value:"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=865480"
);
script_set_attribute(
attribute:"see_also",
value:"https://security-tracker.debian.org/tracker/CVE-2017-7479"
);
script_set_attribute(
attribute:"see_also",
value:"https://security-tracker.debian.org/tracker/CVE-2017-7508"
);
script_set_attribute(
attribute:"see_also",
value:"https://security-tracker.debian.org/tracker/CVE-2017-7520"
);
script_set_attribute(
attribute:"see_also",
value:"https://security-tracker.debian.org/tracker/CVE-2017-7521"
);
script_set_attribute(
attribute:"see_also",
value:"https://packages.debian.org/source/jessie/openvpn"
);
script_set_attribute(
attribute:"see_also",
value:"https://packages.debian.org/source/stretch/openvpn"
);
script_set_attribute(
attribute:"see_also",
value:"https://www.debian.org/security/2017/dsa-3900"
);
script_set_attribute(
attribute:"solution",
value:
"Upgrade the openvpn packages.
For the oldstable distribution (jessie), these problems have been
fixed in version 2.3.4-5+deb8u2.
For the stable distribution (stretch), these problems have been fixed
in version 2.4.0-6+deb9u1."
);
script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:N/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:L/PR:N/UI:N/S:U/C:N/I:N/A:H");
script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
script_set_attribute(attribute:"exploit_available", value:"false");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:openvpn");
script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:8.0");
script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:9.0");
script_set_attribute(attribute:"patch_publication_date", value:"2017/06/27");
script_set_attribute(attribute:"plugin_publication_date", value:"2017/06/28");
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:"Debian Local Security Checks");
script_dependencies("ssh_get_info.nasl");
script_require_keys("Host/local_checks_enabled", "Host/Debian/release", "Host/Debian/dpkg-l");
exit(0);
}
include("audit.inc");
include("debian_package.inc");
if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
if (!get_kb_item("Host/Debian/release")) audit(AUDIT_OS_NOT, "Debian");
if (!get_kb_item("Host/Debian/dpkg-l")) audit(AUDIT_PACKAGE_LIST_MISSING);
flag = 0;
if (deb_check(release:"8.0", prefix:"openvpn", reference:"2.3.4-5+deb8u2")) flag++;
if (deb_check(release:"9.0", prefix:"openvpn", reference:"2.4.0-6+deb9u1")) flag++;
if (flag)
{
if (report_verbosity > 0) security_warning(port:0, extra:deb_report_get());
else security_warning(0);
exit(0);
}
else audit(AUDIT_HOST_NOT, "affected");
Vendor | Product | Version | CPE |
---|---|---|---|
debian | debian_linux | openvpn | p-cpe:/a:debian:debian_linux:openvpn |
debian | debian_linux | 8.0 | cpe:/o:debian:debian_linux:8.0 |
debian | debian_linux | 9.0 | cpe:/o:debian:debian_linux:9.0 |
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-7479
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-7508
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-7520
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-7521
bugs.debian.org/cgi-bin/bugreport.cgi?bug=865480
packages.debian.org/source/jessie/openvpn
packages.debian.org/source/stretch/openvpn
security-tracker.debian.org/tracker/CVE-2017-7479
security-tracker.debian.org/tracker/CVE-2017-7508
security-tracker.debian.org/tracker/CVE-2017-7520
security-tracker.debian.org/tracker/CVE-2017-7521
www.debian.org/security/2017/dsa-3900
5 Medium
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:N/I:N/A:P
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:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
0.017 Low
EPSS
Percentile
87.8%