CVE-2021-21290 Common Vulnerabilities and Exposures

Upstream information

CVE-2021-21290 at MITRE

Description

Netty is an open-source, asynchronous event-driven network application framework for rapid development of maintainable high performance protocol servers & clients. In Netty before version 4.1.59.Final there is a vulnerability on Unix-like systems involving an insecure temp file. When netty's multipart decoders are used local information disclosure can occur via the local system temporary directory if temporary storing uploads on the disk is enabled. On unix-like systems, the temporary directory is shared between all user. As such, writing to this directory using APIs that do not explicitly set the file/directory permissions can lead to information disclosure. Of note, this does not impact modern MacOS Operating Systems. The method "File.createTempFile" on unix-like systems creates a random file, but, by default will create this file with the permissions "-rw-r--r--". Thus, if sensitive information is written to this file, other local users can read this information. This is the case in netty's "AbstractDiskHttpData" is vulnerable. This has been fixed in version 4.1.59.Final. As a workaround, one may specify your own "java.io.tmpdir" when you start the JVM or use "DefaultHttpDataFactory.setBaseDir(...)" to set the directory to something that is only readable by the current user.

SUSE information

Overall state of this security issue: Pending

This issue is currently rated as having low severity.

CVSS v2 Scores
	National Vulnerability Database
Base Score	1.9
Vector	AV:L/AC:M/Au:N/C:P/I:N/A:N
Access Vector	Local
Access Complexity	Medium
Authentication	None
Confidentiality Impact	Partial
Integrity Impact	None
Availability Impact	None

CVSS v3 Scores
	National Vulnerability Database	SUSE
Base Score	5.5	2.9
Vector	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N	CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
Attack Vector	Local	Local
Attack Complexity	Low	High
Privileges Required	Low	None
User Interaction	None	None
Scope	Unchanged	Unchanged
Confidentiality Impact	High	Low
Integrity Impact	None	None
Availability Impact	None	None
CVSSv3 Version	3.1	3.1

SUSE Bugzilla entries: 1182103 [NEW], 1199338 [RESOLVED / FIXED]

SUSE Security Advisories:

SUSE-SU-2022:1271-1, published Wed Apr 20 10:27:06 UTC 2022
SUSE-SU-2022:3617-1, published Tue Oct 18 16:24:41 UTC 2022
SUSE-SU-2022:3760-1, published Wed Oct 26 14:18:30 UTC 2022
SUSE-SU-2022:3793-1, published Thu Oct 27 13:24:15 UTC 2022

List of released packages

Product(s)	Fixed package version(s)	References
Image SLES15-SP3-Manager-4-2-Server-BYOS-Azure Image SLES15-SP3-Manager-4-2-Server-BYOS-EC2-HVM Image SLES15-SP3-Manager-4-2-Server-BYOS-GCE	`netty >= 4.1.44.Final-150300.4.3.2`
Image SLES15-SP4-Manager-Server-4-3 Image SLES15-SP4-Manager-Server-4-3-Azure-llc Image SLES15-SP4-Manager-Server-4-3-Azure-ltd Image SLES15-SP4-Manager-Server-4-3-BYOS Image SLES15-SP4-Manager-Server-4-3-BYOS-Azure Image SLES15-SP4-Manager-Server-4-3-BYOS-EC2 Image SLES15-SP4-Manager-Server-4-3-BYOS-GCE Image SLES15-SP4-Manager-Server-4-3-EC2-llc Image SLES15-SP4-Manager-Server-4-3-EC2-ltd	`netty >= 4.1.44.Final-150400.3.3.2`
SUSE Linux Enterprise Module for Package Hub 15 SP5	`netty >= 4.1.75-150200.4.6.2`	Patchnames: SUSE Linux Enterprise Module for Package Hub 15 SP5 GA netty-4.1.90-150200.4.14.1
SUSE Linux Enterprise Module for Package Hub 15 SP6	`netty >= 4.1.75-150200.4.6.2`	Patchnames: SUSE Linux Enterprise Module for Package Hub 15 SP6 GA netty-4.1.108-150200.4.23.1
SUSE Manager Server Module 4.1	`netty >= 4.1.44.Final-150200.3.4.2`	Patchnames: SUSE-SLE-Module-SUSE-Manager-Server-4.1-2022-3793
SUSE Manager Server Module 4.2	`netty >= 4.1.44.Final-150300.4.3.2`	Patchnames: SUSE-SLE-Module-SUSE-Manager-Server-4.2-2022-3617
SUSE Manager Server Module 4.3	`netty >= 4.1.44.Final-150400.3.3.2`	Patchnames: SUSE-SLE-Module-SUSE-Manager-Server-4.3-2022-3760
openSUSE Leap 15.3	`netty >= 4.1.75-150200.4.6.2` `netty-javadoc >= 4.1.75-150200.4.6.2` `netty-poms >= 4.1.75-150200.4.6.2`	Patchnames: openSUSE-SLE-15.3-2022-1271
openSUSE Tumbleweed	`netty >= 4.1.60-1.4` `netty-javadoc >= 4.1.60-1.4` `netty-poms >= 4.1.60-1.4`	Patchnames: openSUSE-Tumbleweed-2024-11085

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 Module for Package Hub 15 SP5	netty	Released
SUSE Linux Enterprise Module for Package Hub 15 SP6	netty	Released
SUSE Manager Server Module 4.3	netty	Released
openSUSE Leap 15.5	netty	Released
openSUSE Leap 15.6	netty	Released
Products past their end of life and not receiving proactive updates anymore.
SUSE Manager Server Module 4.0	netty	Unsupported
SUSE Manager Server Module 4.1	netty	Released
SUSE Manager Server Module 4.2	netty	Released
openSUSE Leap 15.3	netty	Affected
openSUSE Leap 15.4	netty	Affected

SUSE Timeline for this CVE

CVE page created: Mon Feb 8 22:39:42 2021
CVE page last modified: Wed Nov 13 13:42:34 2024