Upstream information

CVE-2020-28935 at MITRE

Description

NLnet Labs Unbound, up to and including version 1.12.0, and NLnet Labs NSD, up to and including version 4.3.3, contain a local vulnerability that would allow for a local symlink attack. When writing the PID file, Unbound and NSD create the file if it is not there, or open an existing file for writing. In case the file was already present, they would follow symlinks if the file happened to be a symlink instead of a regular file. An additional chown of the file would then take place after it was written, making the user Unbound/NSD is supposed to run as the new owner of the file. If an attacker has local access to the user Unbound/NSD runs as, she could create a symlink in place of the PID file pointing to a file that she would like to erase. If then Unbound/NSD is killed and the PID file is not cleared, upon restarting with root privileges, Unbound/NSD will rewrite any file pointed at by the symlink. This is a local vulnerability that could create a Denial of Service of the system Unbound/NSD is running on. It requires an attacker having access to the limited permission user Unbound/NSD runs as and point through the symlink to a critical file on the system.

SUSE information

Overall state of this security issue: Resolved

This issue is currently rated as having moderate severity.

CVSS v2 Scores
  National Vulnerability Database
Base Score 2.1
Vector AV:L/AC:L/Au:N/C:N/I:N/A:P
Access Vector Local
Access Complexity Low
Authentication None
Confidentiality Impact None
Integrity Impact None
Availability Impact Partial
CVSS v3 Scores
  National Vulnerability Database SUSE
Base Score 5.5 4.4
Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N
Attack Vector Local Local
Attack Complexity Low Low
Privileges Required Low High
User Interaction None None
Scope Unchanged Unchanged
Confidentiality Impact None None
Integrity Impact None High
Availability Impact High None
CVSSv3 Version 3.1 3.1
SUSE Bugzilla entries: 1173619 [RESOLVED / FIXED], 1179191 [RESOLVED / FIXED]

SUSE Security Advisories:

List of released packages

Product(s) Fixed package version(s) References
SUSE CaaS Platform 4.0
  • libunbound2 >= 1.6.8-10.6.1
  • unbound-anchor >= 1.6.8-10.6.1
  • unbound-devel >= 1.6.8-10.6.1
 Patchnames:
SUSE-SUSE-CAASP-4.0-2022-176
SUSE Enterprise Storage 6
  • libunbound2 >= 1.6.8-10.6.1
  • unbound-anchor >= 1.6.8-10.6.1
  • unbound-devel >= 1.6.8-10.6.1
 Patchnames:
SUSE-Storage-6-2022-176
SUSE Enterprise Storage 7.1
SUSE Linux Enterprise Desktop 15 SP3
SUSE Linux Enterprise High Performance Computing 15 SP3
SUSE Linux Enterprise Module for Basesystem 15 SP3
SUSE Linux Enterprise Server 15 SP3
SUSE Linux Enterprise Server for SAP Applications 15 SP3
SUSE Manager Proxy 4.2
SUSE Manager Retail Branch Server 4.2
SUSE Manager Server 4.2
  • libunbound2 >= 1.6.8-10.6.1
  • unbound-anchor >= 1.6.8-10.6.1
  • unbound-devel >= 1.6.8-10.6.1
 Patchnames:
SUSE-SLE-Module-Basesystem-15-SP3-2022-176
SUSE Enterprise Storage 7
  • libunbound2 >= 1.6.8-10.6.1
  • unbound-anchor >= 1.6.8-10.6.1
  • unbound-devel >= 1.6.8-10.6.1
 Patchnames:
SUSE-Storage-7-2022-176
SUSE Liberty Linux 8
  • python3-unbound >= 1.7.3-15.el8
  • unbound >= 1.7.3-15.el8
  • unbound-devel >= 1.7.3-15.el8
  • unbound-libs >= 1.7.3-15.el8
 Patchnames:
RHSA-2021:1853
SUSE Linux Enterprise Desktop 15 SP4
SUSE Linux Enterprise High Performance Computing 15 SP4
SUSE Linux Enterprise Module for Basesystem 15 SP4
SUSE Linux Enterprise Server 15 SP4
SUSE Linux Enterprise Server for SAP Applications 15 SP4
SUSE Manager Proxy 4.3
SUSE Manager Retail Branch Server 4.3
SUSE Manager Server 4.3
  • libunbound2 >= 1.6.8-10.6.1
  • unbound-anchor >= 1.6.8-10.6.1
  • unbound-devel >= 1.6.8-10.6.1
 Patchnames:
SUSE Linux Enterprise Module for Basesystem 15 SP4 GA libunbound2-1.6.8-10.6.1
SUSE Linux Enterprise Module for Basesystem 15 SP4 GA unbound-1.6.8-10.6.1
SUSE Linux Enterprise Desktop 15 SP5
SUSE Linux Enterprise High Performance Computing 15 SP5
SUSE Linux Enterprise Module for Basesystem 15 SP5
SUSE Linux Enterprise Server 15 SP5
SUSE Linux Enterprise Server for SAP Applications 15 SP5
  • libunbound2 >= 1.6.8-10.6.1
  • unbound-anchor >= 1.6.8-10.6.1
  • unbound-devel >= 1.6.8-10.6.1
 Patchnames:
SUSE Linux Enterprise Module for Basesystem 15 SP5 GA libunbound2-1.6.8-150100.10.8.1
SUSE Linux Enterprise Module for Basesystem 15 SP5 GA unbound-1.6.8-150100.10.8.1
SUSE Linux Enterprise Desktop 15 SP6
SUSE Linux Enterprise High Performance Computing 15 SP6
SUSE Linux Enterprise Module for Basesystem 15 SP6
SUSE Linux Enterprise Server 15 SP6
SUSE Linux Enterprise Server for SAP Applications 15 SP6
  • libunbound2 >= 1.6.8-150600.21.6
  • unbound-anchor >= 1.6.8-150600.21.6
  • unbound-devel >= 1.6.8-150600.21.6
 Patchnames:
SUSE Linux Enterprise Module for Basesystem 15 SP6 GA libunbound2-1.6.8-150600.21.6
SUSE Linux Enterprise High Performance Computing 15 SP1-ESPOS
  • libunbound2 >= 1.6.8-10.6.1
  • unbound-anchor >= 1.6.8-10.6.1
  • unbound-devel >= 1.6.8-10.6.1
 Patchnames:
SUSE-SLE-Product-HPC-15-SP1-ESPOS-2022-176
SUSE Linux Enterprise High Performance Computing 15 SP1-LTSS
  • libunbound2 >= 1.6.8-10.6.1
  • unbound-anchor >= 1.6.8-10.6.1
  • unbound-devel >= 1.6.8-10.6.1
 Patchnames:
SUSE-SLE-Product-HPC-15-SP1-LTSS-2022-176
SUSE Linux Enterprise High Performance Computing 15 SP2-ESPOS
  • libunbound2 >= 1.6.8-10.6.1
  • unbound-anchor >= 1.6.8-10.6.1
  • unbound-devel >= 1.6.8-10.6.1
 Patchnames:
SUSE-SLE-Product-HPC-15-SP2-ESPOS-2022-176
SUSE Linux Enterprise High Performance Computing 15 SP2-LTSS
  • libunbound2 >= 1.6.8-10.6.1
  • unbound-anchor >= 1.6.8-10.6.1
  • unbound-devel >= 1.6.8-10.6.1
 Patchnames:
SUSE-SLE-Product-HPC-15-SP2-LTSS-2022-176
SUSE Linux Enterprise High Performance Computing 15-ESPOS
SUSE Linux Enterprise High Performance Computing 15-LTSS
  • libunbound2 >= 1.6.8-3.9.1
  • unbound-anchor >= 1.6.8-3.9.1
  • unbound-devel >= 1.6.8-3.9.1
 Patchnames:
SUSE-SLE-Product-HPC-15-2022-301
SUSE Linux Enterprise Micro 6.0
  • libunbound8 >= 1.17.1-2.15
  • unbound-anchor >= 1.17.1-2.15
 Patchnames:
SUSE Linux Enterprise Micro 6.0 GA libunbound8-1.17.1-2.15
SUSE Linux Enterprise Micro 6.1
  • libunbound8 >= 1.21.0-slfo.1.1_1.2
  • unbound-anchor >= 1.21.0-slfo.1.1_1.2
 Patchnames:
SUSE Linux Enterprise Micro 6.1 GA libunbound8-1.21.0-slfo.1.1_1.2
SUSE Linux Enterprise Module for Package Hub 15 SP5
  • unbound >= 1.6.8-10.6.1
  • unbound-python >= 1.6.8-10.6.1
 Patchnames:
SUSE Linux Enterprise Module for Package Hub 15 SP5 GA unbound-1.6.8-150100.10.8.1
SUSE Linux Enterprise Real Time 15 SP2
  • libunbound2 >= 1.6.8-10.6.1
  • unbound-anchor >= 1.6.8-10.6.1
  • unbound-devel >= 1.6.8-10.6.1
 Patchnames:
SUSE-SLE-Product-RT-15-SP2-2022-176
SUSE Linux Enterprise Server 15 SP1-BCL
  • libunbound2 >= 1.6.8-10.6.1
  • unbound-anchor >= 1.6.8-10.6.1
  • unbound-devel >= 1.6.8-10.6.1
 Patchnames:
SUSE-SLE-Product-SLES-15-SP1-BCL-2022-176
SUSE Linux Enterprise Server 15 SP1-LTSS
  • libunbound2 >= 1.6.8-10.6.1
  • unbound-anchor >= 1.6.8-10.6.1
  • unbound-devel >= 1.6.8-10.6.1
 Patchnames:
SUSE-SLE-Product-SLES-15-SP1-LTSS-2022-176
SUSE Linux Enterprise Server 15 SP2-BCL
  • libunbound2 >= 1.6.8-10.6.1
  • unbound-anchor >= 1.6.8-10.6.1
  • unbound-devel >= 1.6.8-10.6.1
 Patchnames:
SUSE-SLE-Product-SLES-15-SP2-BCL-2022-176
SUSE Linux Enterprise Server 15 SP2-LTSS
  • libunbound2 >= 1.6.8-10.6.1
  • unbound-anchor >= 1.6.8-10.6.1
  • unbound-devel >= 1.6.8-10.6.1
 Patchnames:
SUSE-SLE-Product-SLES-15-SP2-LTSS-2022-176
SUSE Linux Enterprise Server 15-LTSS
  • libunbound2 >= 1.6.8-3.9.1
  • unbound-anchor >= 1.6.8-3.9.1
  • unbound-devel >= 1.6.8-3.9.1
 Patchnames:
SUSE-SLE-Product-SLES-15-2022-301
SUSE Linux Enterprise Server for SAP Applications 15 SP1
  • libunbound2 >= 1.6.8-10.6.1
  • unbound-anchor >= 1.6.8-10.6.1
  • unbound-devel >= 1.6.8-10.6.1
 Patchnames:
SUSE-SLE-Product-SLES_SAP-15-SP1-2022-176
SUSE Linux Enterprise Server for SAP Applications 15 SP2
  • libunbound2 >= 1.6.8-10.6.1
  • unbound-anchor >= 1.6.8-10.6.1
  • unbound-devel >= 1.6.8-10.6.1
 Patchnames:
SUSE-SLE-Product-SLES_SAP-15-SP2-2022-176
SUSE Linux Enterprise Server for SAP Applications 15
  • libunbound2 >= 1.6.8-3.9.1
  • unbound-anchor >= 1.6.8-3.9.1
  • unbound-devel >= 1.6.8-3.9.1
 Patchnames:
SUSE-SLE-Product-SLES_SAP-15-2022-301
SUSE Manager Proxy 4.1
  • libunbound2 >= 1.6.8-10.6.1
  • unbound-anchor >= 1.6.8-10.6.1
  • unbound-devel >= 1.6.8-10.6.1
 Patchnames:
SUSE-SLE-Product-SUSE-Manager-Proxy-4.1-2022-176
SUSE Manager Retail Branch Server 4.1
  • libunbound2 >= 1.6.8-10.6.1
  • unbound-anchor >= 1.6.8-10.6.1
  • unbound-devel >= 1.6.8-10.6.1
 Patchnames:
SUSE-SLE-Product-SUSE-Manager-Retail-Branch-Server-4.1-2022-176
SUSE Manager Server 4.1
  • libunbound2 >= 1.6.8-10.6.1
  • unbound-anchor >= 1.6.8-10.6.1
  • unbound-devel >= 1.6.8-10.6.1
 Patchnames:
SUSE-SLE-Product-SUSE-Manager-Server-4.1-2022-176
SUSE Package Hub 12
  • nsd >= 4.3.4-8.1
 Patchnames:
openSUSE-2020-2222
SUSE Package Hub 15 SP1
  • nsd >= 4.1.27-bp151.3.3.1
 Patchnames:
openSUSE-2020-2222
SUSE Package Hub 15 SP2
  • nsd >= 4.3.4-bp152.2.3.1
 Patchnames:
openSUSE-2020-2222
openSUSE Leap 15.1
  • nsd >= 4.1.27-lp151.2.3.1
 Patchnames:
openSUSE-2020-2222
openSUSE Leap 15.2
  • nsd >= 4.3.4-lp152.2.3.1
 Patchnames:
openSUSE-2020-2222
openSUSE Leap 15.3
  • libunbound2 >= 1.6.8-10.6.1
  • unbound >= 1.6.8-10.6.1
  • unbound-anchor >= 1.6.8-10.6.1
  • unbound-devel >= 1.6.8-10.6.1
  • unbound-munin >= 1.6.8-10.6.1
  • unbound-python >= 1.6.8-10.6.1
 Patchnames:
openSUSE-SLE-15.3-2022-176
openSUSE Tumbleweed
  • libunbound8 >= 1.13.2-1.2
  • nsd >= 4.3.7-1.2
  • python3-unbound >= 1.13.2-1.2
  • unbound >= 1.13.2-1.2
  • unbound-anchor >= 1.13.2-1.2
  • unbound-devel >= 1.13.2-1.2
  • unbound-munin >= 1.13.2-1.2
 Patchnames:
openSUSE-Tumbleweed-2024-11005
openSUSE-Tumbleweed-2024-11100

Status of this issue by product and package

Please note that this evaluation state might be work in progress, incomplete or outdated. Also information for service packs in the LTSS phase is only included for issues meeting the LTSS criteria. If in doubt, feel free to contact us for clarification. The updates are grouped by state of their lifecycle. SUSE product lifecycles are documented on the lifecycle page.

Product(s) Source package State
Products under general support and receiving all security fixes.
SUSE Linux Enterprise Desktop 15 SP5 unbound Released
SUSE Linux Enterprise High Performance Computing 15 SP5 unbound Released
SUSE Linux Enterprise Micro 5.5 unbound Affected
SUSE Linux Enterprise Module for Basesystem 15 SP5 unbound Released
SUSE Linux Enterprise Module for Package Hub 15 SP5 unbound Released
SUSE Linux Enterprise Server 15 SP5 unbound Released
SUSE Linux Enterprise Server for SAP Applications 15 SP5 unbound Released
SUSE Manager Proxy 4.3 unbound Released
SUSE Manager Retail Branch Server 4.3 unbound Released
SUSE Manager Server 4.3 unbound Released
openSUSE Leap 15.5 unbound Affected
Products under Long Term Service Pack support and receiving important and critical security fixes.
SUSE Linux Enterprise Desktop 15 SP4 unbound Released
SUSE Linux Enterprise High Performance Computing 15 SP2 unbound Released
SUSE Linux Enterprise High Performance Computing 15 SP2-ESPOS unbound Released
SUSE Linux Enterprise High Performance Computing 15 SP2-LTSS unbound Released
SUSE Linux Enterprise High Performance Computing 15 SP3 unbound Released
SUSE Linux Enterprise High Performance Computing 15 SP3-ESPOS unbound Affected
SUSE Linux Enterprise High Performance Computing 15 SP3-LTSS unbound Affected
SUSE Linux Enterprise High Performance Computing 15 SP4 unbound Released
SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS unbound Affected
SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS unbound Affected
SUSE Linux Enterprise Module for Basesystem 15 SP2 unbound Released
SUSE Linux Enterprise Module for Basesystem 15 SP3 unbound Released
SUSE Linux Enterprise Module for Basesystem 15 SP4 unbound Released
SUSE Linux Enterprise Server 15 SP2 unbound Released
SUSE Linux Enterprise Server 15 SP2-LTSS unbound Released
SUSE Linux Enterprise Server 15 SP3 unbound Released
SUSE Linux Enterprise Server 15 SP3-LTSS unbound Affected
SUSE Linux Enterprise Server 15 SP4 unbound Released
SUSE Linux Enterprise Server 15 SP4-LTSS unbound Affected
SUSE Linux Enterprise Server 15-ESPOS unbound Released
SUSE Linux Enterprise Server Business Critical Linux 15 SP1 unbound Released
SUSE Linux Enterprise Server Business Critical Linux 15 SP2 unbound Released
SUSE Linux Enterprise Server for SAP Applications 15 SP2 unbound Released
SUSE Linux Enterprise Server for SAP Applications 15 SP3 unbound Released
SUSE Linux Enterprise Server for SAP Applications 15 SP4 unbound Released
Products past their end of life and not receiving proactive updates anymore.
SUSE CaaS Platform 4.0 unbound Released
SUSE CaaS Platform 4.5 unbound Released
SUSE Enterprise Storage 6 unbound Released
SUSE Enterprise Storage 7 unbound Released
SUSE Enterprise Storage 7.1 unbound Released
SUSE Linux Enterprise Desktop 15 unbound Affected
SUSE Linux Enterprise Desktop 15 SP1 unbound Unsupported
SUSE Linux Enterprise Desktop 15 SP2 unbound Released
SUSE Linux Enterprise Desktop 15 SP3 unbound Released
SUSE Linux Enterprise High Performance Computing 15 unbound Affected
SUSE Linux Enterprise High Performance Computing 15 SP1 unbound Unsupported
SUSE Linux Enterprise High Performance Computing 15 SP1-ESPOS unbound Released
SUSE Linux Enterprise High Performance Computing 15 SP1-LTSS unbound Released
SUSE Linux Enterprise High Performance Computing 15-ESPOS unbound Released
SUSE Linux Enterprise High Performance Computing 15-LTSS unbound Released
SUSE Linux Enterprise Module for Basesystem 15 unbound Affected
SUSE Linux Enterprise Module for Basesystem 15 SP1 unbound Unsupported
SUSE Linux Enterprise Module for Package Hub 15 SP3 unbound Affected
SUSE Linux Enterprise Module for Package Hub 15 SP4 unbound Affected
SUSE Linux Enterprise Real Time 15 SP2 unbound Released
SUSE Linux Enterprise Real Time 15 SP3 unbound Affected
SUSE Linux Enterprise Real Time 15 SP4 unbound Affected
SUSE Linux Enterprise Server 15 unbound Affected
SUSE Linux Enterprise Server 15 SP1 unbound Unsupported
SUSE Linux Enterprise Server 15 SP1-BCL unbound Released
SUSE Linux Enterprise Server 15 SP1-LTSS unbound Released
SUSE Linux Enterprise Server 15 SP2-BCL unbound Released
SUSE Linux Enterprise Server 15 SP3-BCL unbound Affected
SUSE Linux Enterprise Server 15-LTSS unbound Released
SUSE Linux Enterprise Server for SAP Applications 15 unbound Released
SUSE Linux Enterprise Server for SAP Applications 15 SP1 unbound Released
SUSE Manager Proxy 4.0 unbound Unsupported
SUSE Manager Proxy 4.1 unbound Released
SUSE Manager Proxy 4.2 unbound Released
SUSE Manager Retail Branch Server 4.0 unbound Unsupported
SUSE Manager Retail Branch Server 4.1 unbound Released
SUSE Manager Retail Branch Server 4.2 unbound Released
SUSE Manager Server 4.0 unbound Unsupported
SUSE Manager Server 4.1 unbound Released
SUSE Manager Server 4.2 unbound Released
SUSE Package Hub 12 nsd Released
SUSE Package Hub 15 SP1 nsd Released
SUSE Package Hub 15 SP2 nsd Released
openSUSE Leap 15.3 unbound Affected
openSUSE Leap 15.4 unbound Affected

SUSE Timeline for this CVE

CVE page created: Wed Nov 25 10:44:05 2020
CVE page last modified: Sat Nov 23 14:13:12 2024