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HistoryMay 30, 2020 - 8:31 p.m.

[SECURITY] [DLA 2227-1] bind9 security update

2020-05-3020:31:20
lists.debian.org
117
bind9
update
dns server
cve-2020-8616
cve-2020-8617
debian 8
jessie
denial of service
logic error
security

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

8.6

Confidence

High

EPSS

0.972

Percentile

99.9%

Package : bind9
Version : 1:9.9.5.dfsg-9+deb8u19
CVE ID : CVE-2020-8616 CVE-2020-8617

Several vulnerabilities were discovered in BIND, a DNS server
implementation.

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.

For Debian 8 "Jessie", these problems have been fixed in version
1:9.9.5.dfsg-9+deb8u19.

We recommend that you upgrade your bind9 packages.

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://wiki.debian.org/LTS

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

8.6

Confidence

High

EPSS

0.972

Percentile

99.9%