Several vulnerabilities were discovered in BIND, a DNS server implementation.
CVE-2021-25214 Greg Kuechle discovered that a malformed incoming IXFR transfer could trigger an assertion failure in named, resulting in denial of service.
CVE-2021-25215 Siva Kakarla discovered that named could crash when a DNAME record placed in the ANSWER section during DNAME chasing turned out to be the final answer to a client query.
CVE-2021-25216 It was discovered that the SPNEGO implementation used by BIND is prone to a buffer overflow vulnerability. This update switches to use the SPNEGO implementation from the Kerberos libraries.
#%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-4909. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#
include('deprecated_nasl_level.inc');
include("compat.inc");
if (description)
{
script_id(149229);
script_version("1.4");
script_set_attribute(attribute:"plugin_modification_date", value:"2021/05/14");
script_cve_id("CVE-2021-25214", "CVE-2021-25215", "CVE-2021-25216");
script_xref(name:"DSA", value:"4909");
script_name(english:"Debian DSA-4909-1 : bind9 - 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 vulnerabilities were discovered in BIND, a DNS server
implementation.
- CVE-2021-25214
Greg Kuechle discovered that a malformed incoming IXFR
transfer could trigger an assertion failure in named,
resulting in denial of service.
- CVE-2021-25215
Siva Kakarla discovered that named could crash when a
DNAME record placed in the ANSWER section during DNAME
chasing turned out to be the final answer to a client
query.
- CVE-2021-25216
It was discovered that the SPNEGO implementation used by
BIND is prone to a buffer overflow vulnerability. This
update switches to use the SPNEGO implementation from
the Kerberos libraries."
);
script_set_attribute(
attribute:"see_also",
value:"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=987741"
);
script_set_attribute(
attribute:"see_also",
value:"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=987742"
);
script_set_attribute(
attribute:"see_also",
value:"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=987743"
);
script_set_attribute(
attribute:"see_also",
value:"https://security-tracker.debian.org/tracker/CVE-2021-25214"
);
script_set_attribute(
attribute:"see_also",
value:"https://security-tracker.debian.org/tracker/CVE-2021-25215"
);
script_set_attribute(
attribute:"see_also",
value:"https://security-tracker.debian.org/tracker/CVE-2021-25216"
);
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/buster/bind9"
);
script_set_attribute(
attribute:"see_also",
value:"https://www.debian.org/security/2021/dsa-4909"
);
script_set_attribute(
attribute:"solution",
value:
"Upgrade the bind9 packages.
For the stable distribution (buster), these problems have been fixed
in version 1:9.11.5.P4+dfsg-5.1+deb10u5."
);
script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:P/I:P/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:H/I:H/A:H");
script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
script_set_attribute(attribute:"cvss_score_source", value:"CVE-2021-25216");
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:bind9");
script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:10.0");
script_set_attribute(attribute:"vuln_publication_date", value:"2021/04/29");
script_set_attribute(attribute:"patch_publication_date", value:"2021/05/01");
script_set_attribute(attribute:"plugin_publication_date", value:"2021/05/03");
script_set_attribute(attribute:"generated_plugin", value:"current");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_copyright(english:"This script is Copyright (C) 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:"10.0", prefix:"bind9", reference:"1:9.11.5.P4+dfsg-5.1+deb10u5")) flag++;
if (deb_check(release:"10.0", prefix:"bind9-doc", reference:"1:9.11.5.P4+dfsg-5.1+deb10u5")) flag++;
if (deb_check(release:"10.0", prefix:"bind9-host", reference:"1:9.11.5.P4+dfsg-5.1+deb10u5")) flag++;
if (deb_check(release:"10.0", prefix:"bind9utils", reference:"1:9.11.5.P4+dfsg-5.1+deb10u5")) flag++;
if (deb_check(release:"10.0", prefix:"dnsutils", reference:"1:9.11.5.P4+dfsg-5.1+deb10u5")) flag++;
if (deb_check(release:"10.0", prefix:"libbind-dev", reference:"1:9.11.5.P4+dfsg-5.1+deb10u5")) flag++;
if (deb_check(release:"10.0", prefix:"libbind-export-dev", reference:"1:9.11.5.P4+dfsg-5.1+deb10u5")) flag++;
if (deb_check(release:"10.0", prefix:"libbind9-161", reference:"1:9.11.5.P4+dfsg-5.1+deb10u5")) flag++;
if (deb_check(release:"10.0", prefix:"libdns-export1104", reference:"1:9.11.5.P4+dfsg-5.1+deb10u5")) flag++;
if (deb_check(release:"10.0", prefix:"libdns-export1104-udeb", reference:"1:9.11.5.P4+dfsg-5.1+deb10u5")) flag++;
if (deb_check(release:"10.0", prefix:"libdns1104", reference:"1:9.11.5.P4+dfsg-5.1+deb10u5")) flag++;
if (deb_check(release:"10.0", prefix:"libirs-export161", reference:"1:9.11.5.P4+dfsg-5.1+deb10u5")) flag++;
if (deb_check(release:"10.0", prefix:"libirs-export161-udeb", reference:"1:9.11.5.P4+dfsg-5.1+deb10u5")) flag++;
if (deb_check(release:"10.0", prefix:"libirs161", reference:"1:9.11.5.P4+dfsg-5.1+deb10u5")) flag++;
if (deb_check(release:"10.0", prefix:"libisc-export1100", reference:"1:9.11.5.P4+dfsg-5.1+deb10u5")) flag++;
if (deb_check(release:"10.0", prefix:"libisc-export1100-udeb", reference:"1:9.11.5.P4+dfsg-5.1+deb10u5")) flag++;
if (deb_check(release:"10.0", prefix:"libisc1100", reference:"1:9.11.5.P4+dfsg-5.1+deb10u5")) flag++;
if (deb_check(release:"10.0", prefix:"libisccc-export161", reference:"1:9.11.5.P4+dfsg-5.1+deb10u5")) flag++;
if (deb_check(release:"10.0", prefix:"libisccc-export161-udeb", reference:"1:9.11.5.P4+dfsg-5.1+deb10u5")) flag++;
if (deb_check(release:"10.0", prefix:"libisccc161", reference:"1:9.11.5.P4+dfsg-5.1+deb10u5")) flag++;
if (deb_check(release:"10.0", prefix:"libisccfg-export163", reference:"1:9.11.5.P4+dfsg-5.1+deb10u5")) flag++;
if (deb_check(release:"10.0", prefix:"libisccfg-export163-udeb", reference:"1:9.11.5.P4+dfsg-5.1+deb10u5")) flag++;
if (deb_check(release:"10.0", prefix:"libisccfg163", reference:"1:9.11.5.P4+dfsg-5.1+deb10u5")) flag++;
if (deb_check(release:"10.0", prefix:"liblwres161", reference:"1:9.11.5.P4+dfsg-5.1+deb10u5")) 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 | bind9 | p-cpe:/a:debian:debian_linux:bind9 |
debian | debian_linux | 10.0 | cpe:/o:debian:debian_linux:10.0 |
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-25214
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-25215
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-25216
bugs.debian.org/cgi-bin/bugreport.cgi?bug=987741
bugs.debian.org/cgi-bin/bugreport.cgi?bug=987742
bugs.debian.org/cgi-bin/bugreport.cgi?bug=987743
packages.debian.org/source/buster/bind9
security-tracker.debian.org/tracker/CVE-2021-25214
security-tracker.debian.org/tracker/CVE-2021-25215
security-tracker.debian.org/tracker/CVE-2021-25216
security-tracker.debian.org/tracker/source-package/bind9
www.debian.org/security/2021/dsa-4909