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 moderate 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
Access Vector Local Local
Access 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 [NEW]

SUSE Security Advisories:

List of released packages

Product(s) Fixed package version(s) References
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 GA netty-4.1.60-1.4


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.

Product(s) Source package State
SUSE Manager Server Module 4.0 netty Unsupported
SUSE Manager Server Module 4.1 netty Affected
SUSE Manager Server Module 4.2 netty Affected
SUSE Manager Server Module 4.3 netty Affected