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
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
AI Score
Confidence
High
EPSS
Percentile
99.9%
Several vulnerabilities were discovered in BIND, a DNS server implementation.
CVE-2019-6477 It was discovered that TCP-pipelined queries can bypass tcp-client limits resulting in denial of service.
CVE-2020-8616 It was discovered that BIND does not sufficiently limit the number of fetches performed when processing referrals. An attacker can take advantage of this flaw to cause a denial of service (performance degradation) or use the recursing server in a reflection attack with a high amplification factor.
CVE-2020-8617 It was discovered that a logic error in the code which checks TSIG validity can be used to trigger an assertion failure, resulting in denial of service.
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Debian Security Advisory DSA-4689. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#
include('compat.inc');
if (description)
{
script_id(136721);
script_version("1.8");
script_set_attribute(attribute:"plugin_modification_date", value:"2024/03/12");
script_cve_id("CVE-2019-6477", "CVE-2020-8616", "CVE-2020-8617");
script_xref(name:"DSA", value:"4689");
script_xref(name:"IAVA", value:"2020-A-0217-S");
script_name(english:"Debian DSA-4689-1 : bind9 - security update");
script_set_attribute(attribute:"synopsis", value:
"The remote Debian host is missing a security-related update.");
script_set_attribute(attribute:"description", value:
"Several vulnerabilities were discovered in BIND, a DNS server
implementation.
- CVE-2019-6477
It was discovered that TCP-pipelined queries can bypass
tcp-client limits resulting in denial of service.
- CVE-2020-8616
It was discovered that BIND does not sufficiently limit
the number of fetches performed when processing
referrals. An attacker can take advantage of this flaw
to cause a denial of service (performance degradation)
or use the recursing server in a reflection attack with
a high amplification factor.
- CVE-2020-8617
It was discovered that a logic error in the code which
checks TSIG validity can be used to trigger an assertion
failure, resulting in denial of service.");
script_set_attribute(attribute:"see_also", value:"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=945171");
script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2019-6477");
script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2020-8616");
script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2020-8617");
script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/source-package/bind9");
script_set_attribute(attribute:"see_also", value:"https://packages.debian.org/source/stretch/bind9");
script_set_attribute(attribute:"see_also", value:"https://packages.debian.org/source/buster/bind9");
script_set_attribute(attribute:"see_also", value:"https://www.debian.org/security/2020/dsa-4689");
script_set_attribute(attribute:"solution", value:
"Upgrade the bind9 packages.
For the oldstable distribution (stretch), these problems have been
fixed in version 1:9.10.3.dfsg.P4-12.3+deb9u6.
For the stable distribution (buster), these problems have been fixed
in version 1:9.11.5.P4+dfsg-5.1+deb10u1.");
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:POC/RL:OF/RC:C");
script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H");
script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
script_set_attribute(attribute:"cvss_score_source", value:"CVE-2020-8616");
script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
script_set_attribute(attribute:"exploit_available", value:"true");
script_set_attribute(attribute:"vuln_publication_date", value:"2019/11/26");
script_set_attribute(attribute:"patch_publication_date", value:"2020/05/19");
script_set_attribute(attribute:"plugin_publication_date", value:"2020/05/20");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:bind9");
script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:10.0");
script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:9.0");
script_set_attribute(attribute:"generated_plugin", value:"current");
script_set_attribute(attribute:"stig_severity", value:"I");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_family(english:"Debian Local Security Checks");
script_copyright(english:"This script is Copyright (C) 2020-2024 and is owned by Tenable, Inc. or an Affiliate thereof.");
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:"10.0", prefix:"bind9", reference:"1:9.11.5.P4+dfsg-5.1+deb10u1")) flag++;
if (deb_check(release:"10.0", prefix:"bind9-doc", reference:"1:9.11.5.P4+dfsg-5.1+deb10u1")) flag++;
if (deb_check(release:"10.0", prefix:"bind9-host", reference:"1:9.11.5.P4+dfsg-5.1+deb10u1")) flag++;
if (deb_check(release:"10.0", prefix:"bind9utils", reference:"1:9.11.5.P4+dfsg-5.1+deb10u1")) flag++;
if (deb_check(release:"10.0", prefix:"dnsutils", reference:"1:9.11.5.P4+dfsg-5.1+deb10u1")) flag++;
if (deb_check(release:"10.0", prefix:"libbind-dev", reference:"1:9.11.5.P4+dfsg-5.1+deb10u1")) flag++;
if (deb_check(release:"10.0", prefix:"libbind-export-dev", reference:"1:9.11.5.P4+dfsg-5.1+deb10u1")) flag++;
if (deb_check(release:"10.0", prefix:"libbind9-161", reference:"1:9.11.5.P4+dfsg-5.1+deb10u1")) flag++;
if (deb_check(release:"10.0", prefix:"libdns-export1104", reference:"1:9.11.5.P4+dfsg-5.1+deb10u1")) flag++;
if (deb_check(release:"10.0", prefix:"libdns-export1104-udeb", reference:"1:9.11.5.P4+dfsg-5.1+deb10u1")) flag++;
if (deb_check(release:"10.0", prefix:"libdns1104", reference:"1:9.11.5.P4+dfsg-5.1+deb10u1")) flag++;
if (deb_check(release:"10.0", prefix:"libirs-export161", reference:"1:9.11.5.P4+dfsg-5.1+deb10u1")) flag++;
if (deb_check(release:"10.0", prefix:"libirs-export161-udeb", reference:"1:9.11.5.P4+dfsg-5.1+deb10u1")) flag++;
if (deb_check(release:"10.0", prefix:"libirs161", reference:"1:9.11.5.P4+dfsg-5.1+deb10u1")) flag++;
if (deb_check(release:"10.0", prefix:"libisc-export1100", reference:"1:9.11.5.P4+dfsg-5.1+deb10u1")) flag++;
if (deb_check(release:"10.0", prefix:"libisc-export1100-udeb", reference:"1:9.11.5.P4+dfsg-5.1+deb10u1")) flag++;
if (deb_check(release:"10.0", prefix:"libisc1100", reference:"1:9.11.5.P4+dfsg-5.1+deb10u1")) flag++;
if (deb_check(release:"10.0", prefix:"libisccc-export161", reference:"1:9.11.5.P4+dfsg-5.1+deb10u1")) flag++;
if (deb_check(release:"10.0", prefix:"libisccc-export161-udeb", reference:"1:9.11.5.P4+dfsg-5.1+deb10u1")) flag++;
if (deb_check(release:"10.0", prefix:"libisccc161", reference:"1:9.11.5.P4+dfsg-5.1+deb10u1")) flag++;
if (deb_check(release:"10.0", prefix:"libisccfg-export163", reference:"1:9.11.5.P4+dfsg-5.1+deb10u1")) flag++;
if (deb_check(release:"10.0", prefix:"libisccfg-export163-udeb", reference:"1:9.11.5.P4+dfsg-5.1+deb10u1")) flag++;
if (deb_check(release:"10.0", prefix:"libisccfg163", reference:"1:9.11.5.P4+dfsg-5.1+deb10u1")) flag++;
if (deb_check(release:"10.0", prefix:"liblwres161", reference:"1:9.11.5.P4+dfsg-5.1+deb10u1")) flag++;
if (deb_check(release:"9.0", prefix:"bind9", reference:"1:9.10.3.dfsg.P4-12.3+deb9u6")) flag++;
if (deb_check(release:"9.0", prefix:"bind9-doc", reference:"1:9.10.3.dfsg.P4-12.3+deb9u6")) flag++;
if (deb_check(release:"9.0", prefix:"bind9-host", reference:"1:9.10.3.dfsg.P4-12.3+deb9u6")) flag++;
if (deb_check(release:"9.0", prefix:"bind9utils", reference:"1:9.10.3.dfsg.P4-12.3+deb9u6")) flag++;
if (deb_check(release:"9.0", prefix:"dnsutils", reference:"1:9.10.3.dfsg.P4-12.3+deb9u6")) flag++;
if (deb_check(release:"9.0", prefix:"host", reference:"1:9.10.3.dfsg.P4-12.3+deb9u6")) flag++;
if (deb_check(release:"9.0", prefix:"libbind-dev", reference:"1:9.10.3.dfsg.P4-12.3+deb9u6")) flag++;
if (deb_check(release:"9.0", prefix:"libbind-export-dev", reference:"1:9.10.3.dfsg.P4-12.3+deb9u6")) flag++;
if (deb_check(release:"9.0", prefix:"libbind9-140", reference:"1:9.10.3.dfsg.P4-12.3+deb9u6")) flag++;
if (deb_check(release:"9.0", prefix:"libdns-export162", reference:"1:9.10.3.dfsg.P4-12.3+deb9u6")) flag++;
if (deb_check(release:"9.0", prefix:"libdns-export162-udeb", reference:"1:9.10.3.dfsg.P4-12.3+deb9u6")) flag++;
if (deb_check(release:"9.0", prefix:"libdns162", reference:"1:9.10.3.dfsg.P4-12.3+deb9u6")) flag++;
if (deb_check(release:"9.0", prefix:"libirs-export141", reference:"1:9.10.3.dfsg.P4-12.3+deb9u6")) flag++;
if (deb_check(release:"9.0", prefix:"libirs-export141-udeb", reference:"1:9.10.3.dfsg.P4-12.3+deb9u6")) flag++;
if (deb_check(release:"9.0", prefix:"libirs141", reference:"1:9.10.3.dfsg.P4-12.3+deb9u6")) flag++;
if (deb_check(release:"9.0", prefix:"libisc-export160", reference:"1:9.10.3.dfsg.P4-12.3+deb9u6")) flag++;
if (deb_check(release:"9.0", prefix:"libisc-export160-udeb", reference:"1:9.10.3.dfsg.P4-12.3+deb9u6")) flag++;
if (deb_check(release:"9.0", prefix:"libisc160", reference:"1:9.10.3.dfsg.P4-12.3+deb9u6")) flag++;
if (deb_check(release:"9.0", prefix:"libisccc-export140", reference:"1:9.10.3.dfsg.P4-12.3+deb9u6")) flag++;
if (deb_check(release:"9.0", prefix:"libisccc-export140-udeb", reference:"1:9.10.3.dfsg.P4-12.3+deb9u6")) flag++;
if (deb_check(release:"9.0", prefix:"libisccc140", reference:"1:9.10.3.dfsg.P4-12.3+deb9u6")) flag++;
if (deb_check(release:"9.0", prefix:"libisccfg-export140", reference:"1:9.10.3.dfsg.P4-12.3+deb9u6")) flag++;
if (deb_check(release:"9.0", prefix:"libisccfg-export140-udeb", reference:"1:9.10.3.dfsg.P4-12.3+deb9u6")) flag++;
if (deb_check(release:"9.0", prefix:"libisccfg140", reference:"1:9.10.3.dfsg.P4-12.3+deb9u6")) flag++;
if (deb_check(release:"9.0", prefix:"liblwres141", reference:"1:9.10.3.dfsg.P4-12.3+deb9u6")) flag++;
if (deb_check(release:"9.0", prefix:"lwresd", reference:"1:9.10.3.dfsg.P4-12.3+deb9u6")) 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");
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-6477
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-8616
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-8617
bugs.debian.org/cgi-bin/bugreport.cgi?bug=945171
packages.debian.org/source/buster/bind9
packages.debian.org/source/stretch/bind9
security-tracker.debian.org/tracker/CVE-2019-6477
security-tracker.debian.org/tracker/CVE-2020-8616
security-tracker.debian.org/tracker/CVE-2020-8617
security-tracker.debian.org/tracker/source-package/bind9
www.debian.org/security/2020/dsa-4689
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
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
AI Score
Confidence
High
EPSS
Percentile
99.9%