bind9: CVE-2020-8616 CVE-2020-8617

Debian Bug report logs - #961939
bind9: CVE-2020-8616 CVE-2020-8617

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Message #5 received at submit@bugs.debian.org (full text, mbox, reply):

From: Salvatore Bonaccorso <carnil@debian.org>

To: Debian Bug Tracking System <submit@bugs.debian.org>

Subject: bind9: CVE-2020-8616 CVE-2020-8617

Date: Sun, 31 May 2020 21:22:07 +0200

Source: bind9
Version: 1:9.16.2-3
Severity: grave
Tags: security upstream
Justification: user security hole
Control: fixed -1 1:9.11.5.P4+dfsg-5.1+deb10u1 
Control: fixed -1 1:9.10.3.dfsg.P4-12.3+deb9u6
Control: found -1 1:9.11.5.P4+dfsg-5.1
Control: found -1 1:9.10.3.dfsg.P4-12.3+deb9u5
Control: found -1 1:9.10.3.dfsg.P4-12.3

Hi,

The following vulnerabilities were published for bind9. Filling mainly
for tracking and making sure there is not stable -> unstable
regression.

CVE-2020-8616[0]:
| A malicious actor who intentionally exploits this lack of effective
| limitation on the number of fetches performed when processing
| referrals can, through the use of specially crafted referrals, cause a
| recursing server to issue a very large number of fetches in an attempt
| to process the referral. This has at least two potential effects: The
| performance of the recursing server can potentially be degraded by the
| additional work required to perform these fetches, and The attacker
| can exploit this behavior to use the recursing server as a reflector
| in a reflection attack with a high amplification factor.


CVE-2020-8617[1]:
| Using a specially-crafted message, an attacker may potentially cause a
| BIND server to reach an inconsistent state if the attacker knows (or
| successfully guesses) the name of a TSIG key used by the server. Since
| BIND, by default, configures a local session key even on servers whose
| configuration does not otherwise make use of it, almost all current
| BIND servers are vulnerable. In releases of BIND dating from March
| 2018 and after, an assertion check in tsig.c detects this inconsistent
| state and deliberately exits. Prior to the introduction of the check
| the server would continue operating in an inconsistent state, with
| potentially harmful results.


If you fix the vulnerabilities please also make sure to include the
CVE (Common Vulnerabilities & Exposures) ids in your changelog entry.

For further information see:

[0] https://security-tracker.debian.org/tracker/CVE-2020-8616
    https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-8616
[1] https://security-tracker.debian.org/tracker/CVE-2020-8617
    https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-8617

Regards,
Salvatore

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