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HistoryFeb 12, 2021 - 4:37 p.m.

[SECURITY] [DLA 2556-1] unbound1.9 security update

2021-02-1216:37:36
lists.debian.org
33

5.5 Medium

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

2.1 Low

CVSS2

Access Vector

LOCAL

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

PARTIAL

AV:L/AC:L/Au:N/C:N/I:N/A:P

0.0004 Low

EPSS

Percentile

13.3%


Debian LTS Advisory DLA-2556-1 [email protected]
https://www.debian.org/lts/security/ Markus Koschany
February 12, 2021 https://wiki.debian.org/LTS

Package : unbound1.9
Version : 1.9.0-2+deb10u2~deb9u1
CVE ID : CVE-2020-12662 CVE-2020-12663 CVE-2020-28935
Debian Bug : 977165

Several security vulnerabilities have been corrected in unbound, a
validating, recursive, caching DNS resolver. Support for the unbound DNS server
has been resumed, the sources can be found in the unbound1.9 source package.

CVE-2020-12662

Unbound has Insufficient Control of Network Message
Volume, aka an "NXNSAttack" issue. This is triggered by random
subdomains in the NSDNAME in NS records.

CVE-2020-12663

Unbound has an infinite loop via malformed DNS answers received from
upstream servers.

CVE-2020-28935

Unbound contains a local vulnerability that would allow for a local symlink
attack. When writing the PID file Unbound creates the file if it is not
there, or opens an existing file for writing. In case the file was already
present, it would follow symlinks if the file happened to be a symlink
instead of a regular file.  

For Debian 9 stretch, these problems have been fixed in version
1.9.0-2+deb10u2~deb9u1.

We recommend that you upgrade your unbound1.9 packages.

For the detailed security status of unbound1.9 please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/unbound1.9

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
Attachment:
signature.asc
Description: This is a digitally signed message part

5.5 Medium

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

2.1 Low

CVSS2

Access Vector

LOCAL

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

PARTIAL

AV:L/AC:L/Au:N/C:N/I:N/A:P

0.0004 Low

EPSS

Percentile

13.3%