CVEvulnerability

CVE-2021-21290

5.5 MEDIUM Published 2021-02-08 Modified 2026-10-08 Official page ↗
Status
Modified
Published
2021-02-08
Last modified
2026-10-08
Assigner
[email protected]
CVSS 3.1 ([email protected])
6.2 MEDIUM — CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CVSS 3.1 ([email protected])
5.5 MEDIUM — CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
CVSS 2.0 ([email protected])
1.9 LOW — AV:L/AC:M/Au:N/C:P/I:N/A:N
Weaknesses
CWE-378, CWE-379, CWE-668

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.

Affected configurations

• netty netty (< 4.1.59) • debian debian linux 9.0 • debian debian linux 10.0 • quarkus quarkus (<= 1.13.7) • oracle banking corporate lending process management 14.2.0 • oracle banking corporate lending process management 14.3.0 • oracle banking corporate lending process management 14.5.0 • oracle banking credit facilities process management 14.2.0 • oracle banking credit facilities process management 14.3.0 • oracle banking credit facilities process management 14.5.0 • oracle banking trade finance process management 14.2.0 • oracle banking trade finance process management 14.3.0 • oracle banking trade finance process management 14.5.0 • oracle communications brm - elastic charging engine 12.0.0.3 • oracle communications design studio 7.4.2 • oracle communications messaging server 8.1 • oracle nosql database (< 20.3) • netapp active iq unified manager • netapp cloud secure agent • netapp snapcenter

Related

Weakness · CWE (3)

  • CWE-378 Creation of Temporary File With Insecure Permissions weakness
  • CWE-379 Creation of Temporary File in Directory with Insecure Permissions weakness
  • CWE-668 Exposure of Resource to Wrong Sphere weakness

Referenced by CWE · observed example (1)

  • CWE-379 Creation of Temporary File in Directory with Insecure Permissions weakness

References