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CVE-2021-21290

MEDIUMCVSS 5.5/10EPSS 1.78%

Last modified

CVE-2021-21290 is a medium-severity vulnerability rated 5.5/10 on the CVSS scale. 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. EPSS estimates a 1.78% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1
5.5/10

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

EPSS Probability
1.78%

75.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
NettyNetty< 4.1.59
DebianDebian Linux9.0
DebianDebian Linux10.0
QuarkusQuarkus<= 1.13.7
OracleBanking Corporate Lending Process Management14.2.0
OracleBanking Corporate Lending Process Management14.3.0
OracleBanking Corporate Lending Process Management14.5.0
OracleBanking Credit Facilities Process Management14.2.0
OracleBanking Credit Facilities Process Management14.3.0
OracleBanking Credit Facilities Process Management14.5.0
OracleBanking Trade Finance Process Management14.2.0
OracleBanking Trade Finance Process Management14.3.0
OracleBanking Trade Finance Process Management14.5.0
OracleCommunications Brm - Elastic Charging Engine12.0.0.3
OracleCommunications Design Studio7.4.2
OracleCommunications Messaging Server8.1
OracleNosql Database< 20.3
NetappActive Iq Unified ManagerAll versions
NetappCloud Secure AgentAll versions
NetappSnapcenterAll versions

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2021-21290?
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.
How severe is CVE-2021-21290?
CVE-2021-21290 has a CVSS score of 5.5/10 (MEDIUM severity). The EPSS model estimates a 1.78% probability of exploitation in the next 30 days.
How do I fix CVE-2021-21290?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST