1209777 – (CVE-2020-36691) VUL-0: CVE-2020-36691: kernel: lib/nlattr.c allows attackers to cause a denial of service

Bug 1209777 (CVE-2020-36691) - VUL-0: CVE-2020-36691: kernel: lib/nlattr.c allows attackers to cause a denial of service

Summary: VUL-0: CVE-2020-36691: kernel: lib/nlattr.c allows attackers to cause a denia...

Status:	RESOLVED FIXED

Alias:	CVE-2020-36691

Product:	SUSE Security Incidents
Classification:	Novell Products
Component:	Incidents (show other bugs)
Version:	unspecified
Hardware:	Other Other

Priority:	P3 - Medium Severity: Normal
Target Milestone:	---
Assignee:	Security Team bot
QA Contact:	Security Team bot

URL:	https://smash.suse.de/issue/361172/
Whiteboard:
Keywords:

Depends on:
Blocks:

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Reported:	2023-03-27 09:20 UTC by Alexander Bergmann
Modified:	2024-07-04 09:12 UTC (History)
CC List:	4 users (show)

See Also:
Found By:	Security Response Team
Services Priority:
Business Priority:
Blocker:	---
Marketing QA Status:	---
IT Deployment:	---

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Description Alexander Bergmann 2023-03-27 09:20:30 UTC

CVE-2020-36691

An issue was discovered in the Linux kernel before 5.8. lib/nlattr.c allows attackers to cause a denial of service (unbounded recursion) via a nested Netlink policy with a back reference.

References:

https://github.com/torvalds/linux/commit/7690aa1cdf7c4565ad6b013b324c28b685505e24
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.8

References:
http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-36691
https://bugzilla.redhat.com/show_bug.cgi?id=2181614
https://www.cve.org/CVERecord?id=CVE-2020-36691
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.8
https://github.com/torvalds/linux/commit/7690aa1cdf7c4565ad6b013b324c28b685505e24

Comment 1 Joey Lee 2023-03-28 15:04:01 UTC

Hi Michal, 

This issue relates to netlink. Could you please check it?
If this area is not handled by you, feel free to reassign back to kernel-bugs@suse.de.

Thanks!

Comment 2 Maintenance Automation 2023-04-18 12:31:04 UTC

SUSE-SU-2023:1894-1: An update that solves 14 vulnerabilities and has 20 fixes can now be installed.

Category: security (important)
Bug References: 1065729, 1109158, 1142926, 1181001, 1193231, 1199837, 1203693, 1206010, 1207001, 1207125, 1207890, 1208048, 1208599, 1208777, 1208850, 1209052, 1209118, 1209126, 1209256, 1209289, 1209291, 1209292, 1209532, 1209547, 1209549, 1209556, 1209572, 1209613, 1209634, 1209684, 1209687, 1209777, 1209778, 1209798
CVE References: CVE-2017-5753, CVE-2020-36691, CVE-2021-3923, CVE-2022-20567, CVE-2023-1076, CVE-2023-1095, CVE-2023-1281, CVE-2023-1390, CVE-2023-1513, CVE-2023-1611, CVE-2023-23455, CVE-2023-28328, CVE-2023-28464, CVE-2023-28772
Sources used:
SUSE Linux Enterprise Real Time 12 SP5 (src): kernel-syms-rt-4.12.14-10.121.1, kernel-source-rt-4.12.14-10.121.1

NOTE: This line indicates an update has been released for the listed product(s). At times this might be only a partial fix. If you have questions please reach out to maintenance coordination.

Comment 3 Maintenance Automation 2023-05-09 16:30:02 UTC

SUSE-SU-2023:2151-1: An update that solves 11 vulnerabilities and has five fixes can now be installed.

Category: security (important)
Bug References: 1202353, 1205128, 1209613, 1209687, 1209777, 1209871, 1209887, 1210202, 1210301, 1210329, 1210336, 1210337, 1210469, 1210498, 1210506, 1210647
CVE References: CVE-2020-36691, CVE-2022-43945, CVE-2023-1611, CVE-2023-1670, CVE-2023-1855, CVE-2023-1989, CVE-2023-1990, CVE-2023-1998, CVE-2023-2124, CVE-2023-2162, CVE-2023-30772
Sources used:
SUSE Linux Enterprise Live Patching 15-SP1 (src): kernel-livepatch-SLE15-SP1_Update_40-1-150100.3.3.1
SUSE Linux Enterprise High Performance Computing 15 SP1 LTSS 15-SP1 (src): kernel-obs-build-4.12.14-150100.197.145.1, kernel-source-4.12.14-150100.197.145.1, kernel-syms-4.12.14-150100.197.145.1
SUSE Linux Enterprise Server 15 SP1 LTSS 15-SP1 (src): kernel-obs-build-4.12.14-150100.197.145.1, kernel-source-4.12.14-150100.197.145.1, kernel-syms-4.12.14-150100.197.145.1
SUSE Linux Enterprise Server for SAP Applications 15 SP1 (src): kernel-obs-build-4.12.14-150100.197.145.1, kernel-source-4.12.14-150100.197.145.1, kernel-syms-4.12.14-150100.197.145.1
SUSE CaaS Platform 4.0 (src): kernel-obs-build-4.12.14-150100.197.145.1, kernel-source-4.12.14-150100.197.145.1, kernel-syms-4.12.14-150100.197.145.1

NOTE: This line indicates an update has been released for the listed product(s). At times this might be only a partial fix. If you have questions please reach out to maintenance coordination.

Comment 4 Maintenance Automation 2023-05-09 16:30:11 UTC

SUSE-SU-2023:2146-1: An update that solves 15 vulnerabilities and has five fixes can now be installed.

Category: security (important)
Bug References: 1202353, 1205128, 1206992, 1209613, 1209687, 1209777, 1209871, 1210202, 1210203, 1210301, 1210329, 1210336, 1210337, 1210414, 1210417, 1210453, 1210469, 1210506, 1210629, 1210647
CVE References: CVE-2020-36691, CVE-2022-2196, CVE-2022-43945, CVE-2023-1611, CVE-2023-1670, CVE-2023-1838, CVE-2023-1855, CVE-2023-1872, CVE-2023-1989, CVE-2023-1990, CVE-2023-1998, CVE-2023-2008, CVE-2023-2162, CVE-2023-2176, CVE-2023-30772
Sources used:
SUSE Linux Enterprise Live Patching 15-SP2 (src): kernel-livepatch-SLE15-SP2_Update_36-1-150200.5.3.1
SUSE Linux Enterprise High Performance Computing 15 SP2 LTSS 15-SP2 (src): kernel-source-5.3.18-150200.24.151.1, kernel-default-base-5.3.18-150200.24.151.1.150200.9.73.1, kernel-syms-5.3.18-150200.24.151.1, kernel-obs-build-5.3.18-150200.24.151.1
SUSE Linux Enterprise Server 15 SP2 LTSS 15-SP2 (src): kernel-source-5.3.18-150200.24.151.1, kernel-default-base-5.3.18-150200.24.151.1.150200.9.73.1, kernel-syms-5.3.18-150200.24.151.1, kernel-obs-build-5.3.18-150200.24.151.1
SUSE Linux Enterprise Server for SAP Applications 15 SP2 (src): kernel-source-5.3.18-150200.24.151.1, kernel-default-base-5.3.18-150200.24.151.1.150200.9.73.1, kernel-syms-5.3.18-150200.24.151.1, kernel-obs-build-5.3.18-150200.24.151.1
SUSE Enterprise Storage 7 (src): kernel-source-5.3.18-150200.24.151.1, kernel-default-base-5.3.18-150200.24.151.1.150200.9.73.1, kernel-syms-5.3.18-150200.24.151.1, kernel-obs-build-5.3.18-150200.24.151.1

NOTE: This line indicates an update has been released for the listed product(s). At times this might be only a partial fix. If you have questions please reach out to maintenance coordination.

Comment 5 Maintenance Automation 2023-05-09 16:30:47 UTC

SUSE-SU-2023:2148-1: An update that solves 16 vulnerabilities and has five fixes can now be installed.

Category: security (important)
Bug References: 1202353, 1205128, 1206992, 1207088, 1209687, 1209739, 1209777, 1209871, 1210202, 1210203, 1210301, 1210329, 1210336, 1210337, 1210414, 1210453, 1210469, 1210498, 1210506, 1210629, 1210647
CVE References: CVE-2020-36691, CVE-2022-2196, CVE-2022-43945, CVE-2023-1611, CVE-2023-1670, CVE-2023-1838, CVE-2023-1855, CVE-2023-1872, CVE-2023-1989, CVE-2023-1990, CVE-2023-1998, CVE-2023-2008, CVE-2023-2124, CVE-2023-2162, CVE-2023-2176, CVE-2023-30772
Sources used:
SUSE Linux Enterprise Live Patching 15-SP3 (src): kernel-livepatch-SLE15-SP3_Update_32-1-150300.7.3.2
SUSE Linux Enterprise High Performance Computing ESPOS 15 SP3 (src): kernel-syms-5.3.18-150300.59.121.1, kernel-default-base-5.3.18-150300.59.121.2.150300.18.70.2, kernel-source-5.3.18-150300.59.121.2, kernel-obs-build-5.3.18-150300.59.121.2
SUSE Linux Enterprise High Performance Computing LTSS 15 SP3 (src): kernel-syms-5.3.18-150300.59.121.1, kernel-default-base-5.3.18-150300.59.121.2.150300.18.70.2, kernel-source-5.3.18-150300.59.121.2, kernel-obs-build-5.3.18-150300.59.121.2
SUSE Linux Enterprise Real Time 15 SP3 (src): kernel-syms-5.3.18-150300.59.121.1, kernel-default-base-5.3.18-150300.59.121.2.150300.18.70.2, kernel-source-5.3.18-150300.59.121.2, kernel-obs-build-5.3.18-150300.59.121.2
SUSE Linux Enterprise Server 15 SP3 LTSS 15-SP3 (src): kernel-syms-5.3.18-150300.59.121.1, kernel-default-base-5.3.18-150300.59.121.2.150300.18.70.2, kernel-source-5.3.18-150300.59.121.2, kernel-obs-build-5.3.18-150300.59.121.2
SUSE Linux Enterprise Server for SAP Applications 15 SP3 (src): kernel-syms-5.3.18-150300.59.121.1, kernel-default-base-5.3.18-150300.59.121.2.150300.18.70.2, kernel-source-5.3.18-150300.59.121.2, kernel-obs-build-5.3.18-150300.59.121.2
SUSE Manager Proxy 4.2 (src): kernel-default-base-5.3.18-150300.59.121.2.150300.18.70.2, kernel-source-5.3.18-150300.59.121.2
SUSE Manager Retail Branch Server 4.2 (src): kernel-default-base-5.3.18-150300.59.121.2.150300.18.70.2, kernel-source-5.3.18-150300.59.121.2
SUSE Manager Server 4.2 (src): kernel-default-base-5.3.18-150300.59.121.2.150300.18.70.2, kernel-source-5.3.18-150300.59.121.2
SUSE Enterprise Storage 7.1 (src): kernel-syms-5.3.18-150300.59.121.1, kernel-default-base-5.3.18-150300.59.121.2.150300.18.70.2, kernel-source-5.3.18-150300.59.121.2, kernel-obs-build-5.3.18-150300.59.121.2
SUSE Linux Enterprise Micro 5.1 (src): kernel-default-base-5.3.18-150300.59.121.2.150300.18.70.2
SUSE Linux Enterprise Micro 5.2 (src): kernel-default-base-5.3.18-150300.59.121.2.150300.18.70.2
SUSE Linux Enterprise Micro for Rancher 5.2 (src): kernel-default-base-5.3.18-150300.59.121.2.150300.18.70.2

NOTE: This line indicates an update has been released for the listed product(s). At times this might be only a partial fix. If you have questions please reach out to maintenance coordination.

Comment 6 Maintenance Automation 2023-05-09 16:30:54 UTC

SUSE-SU-2023:2147-1: An update that solves 15 vulnerabilities and has five fixes can now be installed.

Category: security (important)
Bug References: 1202353, 1206992, 1207088, 1209687, 1209739, 1209777, 1209871, 1210202, 1210203, 1210301, 1210329, 1210336, 1210337, 1210414, 1210453, 1210469, 1210498, 1210506, 1210629, 1210647
CVE References: CVE-2020-36691, CVE-2022-2196, CVE-2023-1611, CVE-2023-1670, CVE-2023-1838, CVE-2023-1855, CVE-2023-1872, CVE-2023-1989, CVE-2023-1990, CVE-2023-1998, CVE-2023-2008, CVE-2023-2124, CVE-2023-2162, CVE-2023-2176, CVE-2023-30772
Sources used:
SUSE Real Time Module 15-SP3 (src): kernel-syms-rt-5.3.18-150300.127.1, kernel-source-rt-5.3.18-150300.127.1

NOTE: This line indicates an update has been released for the listed product(s). At times this might be only a partial fix. If you have questions please reach out to maintenance coordination.

Comment 7 Maintenance Automation 2023-05-10 20:30:14 UTC

SUSE-SU-2023:2162-1: An update that solves 12 vulnerabilities and has 17 fixes can now be installed.

Category: security (important)
Bug References: 1142685, 1142926, 1174777, 1190544, 1202353, 1205128, 1207088, 1209342, 1209687, 1209777, 1209871, 1209887, 1209969, 1209999, 1210202, 1210301, 1210329, 1210336, 1210337, 1210430, 1210460, 1210466, 1210469, 1210498, 1210506, 1210534, 1210647, 1210827, 1211037
CVE References: CVE-2020-36691, CVE-2022-43945, CVE-2023-1611, CVE-2023-1670, CVE-2023-1855, CVE-2023-1989, CVE-2023-1990, CVE-2023-1998, CVE-2023-2124, CVE-2023-2162, CVE-2023-2483, CVE-2023-30772
Sources used:
SUSE Linux Enterprise Server for SAP Applications 12 SP5 (src): kernel-source-azure-4.12.14-16.133.1, kernel-syms-azure-4.12.14-16.133.1
SUSE Linux Enterprise High Performance Computing 12 SP5 (src): kernel-source-azure-4.12.14-16.133.1, kernel-syms-azure-4.12.14-16.133.1
SUSE Linux Enterprise Server 12 SP5 (src): kernel-source-azure-4.12.14-16.133.1, kernel-syms-azure-4.12.14-16.133.1

NOTE: This line indicates an update has been released for the listed product(s). At times this might be only a partial fix. If you have questions please reach out to maintenance coordination.

Comment 8 Maintenance Automation 2023-05-11 08:30:07 UTC

SUSE-SU-2023:2163-1: An update that solves 12 vulnerabilities and has 17 fixes can now be installed.

Category: security (important)
Bug References: 1142685, 1142926, 1174777, 1190544, 1202353, 1205128, 1207088, 1209342, 1209687, 1209777, 1209871, 1209887, 1209969, 1209999, 1210202, 1210301, 1210329, 1210336, 1210337, 1210430, 1210460, 1210466, 1210469, 1210498, 1210506, 1210534, 1210647, 1210827, 1211037
CVE References: CVE-2020-36691, CVE-2022-43945, CVE-2023-1611, CVE-2023-1670, CVE-2023-1855, CVE-2023-1989, CVE-2023-1990, CVE-2023-1998, CVE-2023-2124, CVE-2023-2162, CVE-2023-2483, CVE-2023-30772
Sources used:
SUSE Linux Enterprise Live Patching 12-SP5 (src): kgraft-patch-SLE12-SP5_Update_43-1-8.3.1
SUSE Linux Enterprise Software Development Kit 12 SP5 (src): kernel-obs-build-4.12.14-122.159.1
SUSE Linux Enterprise High Performance Computing 12 SP5 (src): kernel-syms-4.12.14-122.159.1, kernel-source-4.12.14-122.159.1
SUSE Linux Enterprise Server 12 SP5 (src): kernel-syms-4.12.14-122.159.1, kernel-source-4.12.14-122.159.1
SUSE Linux Enterprise Server for SAP Applications 12 SP5 (src): kernel-syms-4.12.14-122.159.1, kernel-source-4.12.14-122.159.1

NOTE: This line indicates an update has been released for the listed product(s). At times this might be only a partial fix. If you have questions please reach out to maintenance coordination.

Comment 9 Maintenance Automation 2023-05-17 16:30:11 UTC

SUSE-SU-2023:2232-1: An update that solves 28 vulnerabilities and has 14 fixes can now be installed.

Category: security (important)
Bug References: 1076830, 1194535, 1202353, 1205128, 1207036, 1207125, 1207168, 1207185, 1207795, 1207845, 1208179, 1208333, 1208599, 1208777, 1208837, 1208850, 1209008, 1209052, 1209256, 1209289, 1209291, 1209532, 1209547, 1209549, 1209613, 1209687, 1209777, 1209778, 1209845, 1209871, 1209887, 1210124, 1210202, 1210301, 1210329, 1210336, 1210337, 1210469, 1210498, 1210506, 1210647, 1211037
CVE References: CVE-2017-5753, CVE-2020-36691, CVE-2021-3923, CVE-2021-4203, CVE-2022-20567, CVE-2022-43945, CVE-2023-0590, CVE-2023-0597, CVE-2023-1076, CVE-2023-1095, CVE-2023-1118, CVE-2023-1390, CVE-2023-1513, CVE-2023-1611, CVE-2023-1670, CVE-2023-1855, CVE-2023-1989, CVE-2023-1990, CVE-2023-1998, CVE-2023-2124, CVE-2023-2162, CVE-2023-23454, CVE-2023-23455, CVE-2023-2483, CVE-2023-28328, CVE-2023-28464, CVE-2023-28772, CVE-2023-30772
Sources used:
SUSE OpenStack Cloud 9 (src): kernel-source-4.12.14-95.125.1, kernel-syms-4.12.14-95.125.1
SUSE OpenStack Cloud Crowbar 9 (src): kernel-source-4.12.14-95.125.1, kernel-syms-4.12.14-95.125.1
SUSE Linux Enterprise Server for SAP Applications 12 SP4 (src): kernel-source-4.12.14-95.125.1, kernel-syms-4.12.14-95.125.1, drbd-9.0.14+git.62f906cf-4.26.2
SUSE Linux Enterprise High Availability Extension 12 SP4 (src): drbd-9.0.14+git.62f906cf-4.26.2
SUSE Linux Enterprise Live Patching 12-SP4 (src): kgraft-patch-SLE12-SP4_Update_35-1-6.5.1
SUSE Linux Enterprise Server 12 SP4 ESPOS 12-SP4 (src): kernel-source-4.12.14-95.125.1, kernel-syms-4.12.14-95.125.1
SUSE Linux Enterprise Server 12 SP4 LTSS 12-SP4 (src): kernel-source-4.12.14-95.125.1, kernel-syms-4.12.14-95.125.1

NOTE: This line indicates an update has been released for the listed product(s). At times this might be only a partial fix. If you have questions please reach out to maintenance coordination.

Comment 11 Michal Kubeček 2023-06-08 12:39:31 UTC

(In reply to Gianluca Gabrielli from comment #10)
> From our internal issue tracker I still see the following branches as
> affected. Can you please review them?
> 
> - cve/linux-5.3
> - cve/linux-4.12

Both of these have the fix already and even with CVE-2020-36691 reference,
but with bsc#1209613 reference rather than bsc#1209777.

> - cve/linux-4.4
> - cve/linux-3.0

These are not affected as there was no NLA_NESTED_ARRAY type and NLA_NESTED
did not support nested policies. Therefore there is no recursion in policy
validation and no need to limit recursion depth.

The only remaining question is if we want to add also bsc#1209777 reference
to the fix in cve/linux-5.3 and cve/linux-4.12 or if bsc#1209613 reference
is sufficient.