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nessusThis script is Copyright (C) 2020-2024 and is owned by Tenable, Inc. or an Affiliate thereof.DEBIAN_DSA-4689.NASL
HistoryMay 20, 2020 - 12:00 a.m.

Debian DSA-4689-1 : bind9 - security update

2020-05-2000:00:00
This script is Copyright (C) 2020-2024 and is owned by Tenable, Inc. or an Affiliate thereof.
www.tenable.com
27
debian
dsa-4689-1
bind9
vulnerabilities
dns server
cve-2019-6477
tcp-pipelined queries
denial of service
cve-2020-8616
fetches limit
denial of service
reflection attack
amplification factor
cve-2020-8617
logic error
tsig validity
assertion failure.

CVSS2

5

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

8.6

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

8

Confidence

High

EPSS

0.972

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");

CVSS2

5

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

8.6

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

8

Confidence

High

EPSS

0.972

Percentile

99.9%